The Accord-1M active acoustic system has been produced by the Riga Electromechanical Plant since 1972.
There is no other information on AAS yet.
The highest-class acoustic system "Amfiton 25AS-027" has been produced by the Lvov Lenin Medical Production Association since 1987.
The speakers are designed for high-quality reproduction of music programs as part of a top-class UCU complex. Low-frequency functions are performed by a head type 25GD-42, mid-frequency -
noah - 15GD-11, high-frequency - isodynamic head - 10GI-1. The magnetic system of such a head consists of 2 parallel rows of magnets; a flat membrane is made of a polymer film on which a voice coil is applied. The membrane provides an inertia-free radiation mode, which made it possible to expand the frequency range reproduced by the head to 31.5 kHz and reduce its nonlinear and phase distortions. The speakers are assembled in enclosures made of special pressed chipboards and covered with a thin film imitation of valuable wood species. For aesthetics, the speakers are made in mirror image.
Main technical characteristics:
The Leningrad plant "Ferropribor" also produced the same speakers since 1987 but with the name "Electronics" 25AS-027
The Amfiton 25AS-131 acoustic system has been produced since 1986 by the Carpathian Radio Plant, Ivano-Frankivsk and LPO named after. V.I.Lenin, Lvov.
Designed for high-quality reproduction of music or speech programs in stationary conditions. The recommended power of a high-quality household amplifier is 20... 50 W. The preferred installation option is shelf-mounted.
Specifications:
The speaker uses a 50GDN-3 as a bass head, and a 25GDV-1-8 as a mid-high frequency head. The heads are framed with decorative overlays: a rectangular LF head overlay, a rectangular mid-high-frequency head overlay, the middle part has a special shape that improves the frequency response of sound pressure in the HF region. The internal volume of the speaker is 25 dm. To reduce the impact on the frequency response and sound quality of resonances, the internal volume of the housing is filled with a sound absorber made of technical wool. Electric filters are installed inside the housing, providing band separation at a frequency of 3 kHz, which creates a frequency response rolloff of 6 dB per octave.
Acoustic systems "10AC-203". Manufacturer not identified. Production since 1977.
Each of the acoustic systems has a 10GD-36 or 10GD-36K broadband loudspeaker installed.
The dimensions of one speaker are 420x300x270 mm.
The weight of one speaker is 8.5 kg.
Produced by the Berdsk Radio Plant and the Kyiv Communist Plant since 1974.
Acoustic systems "10MAS-1M" are intended as remote speakers for high-quality reproduction of sound tracks in monophonic and stereophonic systems.
Specifications:
Price (1974) - 70 rubles.
Produced by Berdsk Production Association "Vega" since 1980.
(The later name "25AS-102 according to GOST 23262-88 was produced since 1989)
Household speakers "15AC-110" are designed for high-quality reproduction of speech and music sound programs in stationary conditions.
Specifications:
(Old name)
Household speakers "25AC-101" are designed for high-quality reproduction of speech and music sound programs in stationary conditions.
Specifications:
Produced by Berdsk Production Association "Vega" since 1989.
(Old name)
Household speakers "25AC-102" are designed for high-quality reproduction of speech and music sound programs in stationary conditions.
Specifications:
3-way loudspeaker "25AS-109" (according to GOST 23262-83) is a closed-type acoustic system. New name: "25AS-309"
Price 110 rubles.
3-way loudspeaker "25AC-309" is a closed-type acoustic system.
Old name:
Designed to work together with high-quality amplifying household radio equipment. class.
Price 110 rubles.
The active acoustic system "25AS-311" has been produced by the Tallinn plant "Punane-RET" since 1982.
The active acoustic system - ""25AS-311"" is designed to reproduce sound as part of the radio - ""Estonia-009S"". AAS has its own amplifier
power, a filter that divides the frequency spectrum into 3 bands, each of which is reproduced by different speakers. There is an independent power supply.
In the new AAS, the grilles were covered with paralon on top, which is no longer in the photo.
The acoustic system "25AC-416" has been in serial production since 1982.
Small-sized, two-way acoustic system "25AC-416" - designed for high-quality reproduction of music and speech phonograms
from various amplifiers of the first or second classes.
Specifications:
Price (1982): 110 rub.
Literature:
Three-way acoustic systems "35AC-012" (S-90) have been produced by the Bryansk Electromechanical Plant since 1975
The "S-90" acoustic system is the first domestic speaker system that meets all the requirements of international documents for "Hi-Fi" class equipment. The recommended power input to the speakers is from 20 to 90 watts, the nominal is 35 watts, and the maximum permissible is 90 watts. The range of sound frequencies effectively reproduced by the acoustic system consists of the frequency response of three loudspeakers: low-frequency type - 30GD-2 (75GDN-1-4/8 or 75GDN-3), mid-frequency type - 15GD-11A (20GDS-1-8 or 20GDS- 3) and high-frequency 6GD-6-25 (6GDV-6-16 or 10GD-35 or 10GDV-3) which, with their frequency response, complement and equalize the overall amplitude-frequency characteristic of the acoustic system, which is equal to - 25...25,000 Hz.
Speaker dimensions 360x710x285 mm.
The acoustic system "35AS-013" (S-70) has been produced by the Riga Radio Plant named after AS.Popov since 1987.
The acoustic system "35AC-013" is designed for high-quality reproduction of sound frequencies as part of a stereophonic complex and for playing programs in monophonic sound. The use of acoustic systems involves the use of a stereo preamplifier with a tone control unit. The retail price of one speaker of type "35AC-013" (S-70) is 185 rubles.
Three-way acoustic systems "Orbita-35AS-016" were serially produced by MZTB "Yantar", Moscow since 1984.
The Orbita 35AC-016 acoustic system is designed for high-quality reproduction of speech and music programs, and can work with any high-class household sound reinforcement equipment. The acoustic system has three heads: low-frequency type 30GD-2, mid-frequency type 15GD-11A and high-frequency type 10GD-35.
The speakers have stepped tone controls for mid and high frequencies.
Specifications:
The highest class acoustic system "35AC-1" (S-90) was produced Riga PA "Radio Engineering" since 1977.
Three-way speaker system - ""35AC-1"" developed in early 1977 by the Orbita design bureau, Riga Production Association"Radio Engineering" became the second speaker in the whole series - "S-90", whichwas designed for high quality sound reproductiondeniya in domestic conditions. At that time, the sound of the speaker would have beenla the best among domestic ones, not inferior to many foreign ones.
Literature:
Three-way speaker systems "35AC-212" (S-90) have been produced by the Riga Radio Plant named after Popov since 1980.
The "S-90" acoustic system (see also:) is designed for high-quality reproduction of music and speech programs in stationary living conditions (performance category UHL 4.2 according to GOST 15150-69).
The recommended power input to the speakers is from 20 to 90 watts, the nominal is 35 watts, and the maximum permissible is 90 watts. The range of sound frequencies effectively reproduced by the acoustic system consists of the frequency response of three loudspeakers: low-frequency type - 30GD-2 (75GDN-1-4/8 or 75GDN-3), mid-frequency type - 15GD-11A (20GDS-1-8 or 20GDS- 3) and high-frequency 6GD-6-25 (6GDV-6-16 or 10GD-35 or 10GDV-3) which, with their frequency response, complement and equalize the overall amplitude-frequency characteristic of the acoustic system, which is equal to - 25...25,000 Hz.
Speaker input impedance 3.2 ohms. Speakers with an input resistance of 7.6 ohms were also produced.
The speaker body is non-separable (16 mm chipboard), with the exception of its front panel (22 mm plywood)
A special frame with fabric can also be placed on the front panel to give the speaker system a domestic rather than technical appearance. The speakers were produced in a mirror version.
The bass reflex speaker is tuned to a frequency of 31 Hz. The bass reflex output is located in the lower corner of the housing.
Speaker dimensions 360x710x285 mm.
The acoustic system "35ASDS-017" was produced by Lvov Production Association named after. Lenin (PO Lort) since 1984.
Three-way dynostatic speaker system with bass reflex "35ASDS-017" provides high-quality reproduction of sound programs in
complete with high-quality household radio-electronic equipment. AC provides high sound purity, does not tire the listener, creates good stereo
effect and presence. In the acoustic system, electrostatic loudspeaker heads are used as high-frequency and mid-frequency units.
speakers (HF and MF, 2 pcs. each), characterized by very low transient, phase, frequency and nonlinear distortions; as a low-frequency link when
The dynamic head of the loudspeaker type "75 GDN-3" has been replaced, there is a smooth HF tone control that allows you to adjust within certain limits (5 dB)
timbral coloring of the sound of the acoustic system.
Specifications:
The 35ASDS-017 acoustic system is made in the form of two structurally interconnected blocks - low-frequency and mid-high-frequency. The body of the low-frequency unit is made in the form of a rectangular non-demountable box made of chipboard, veneered with valuable wood veneer. The thickness of the case walls is 18 mm; the front panel, in order to increase its rigidity, is made of a 38 mm thick plate. The 75GDN-Z head, manufactured by PRZ, Ivano-Frankovsk and installed on the front panel of the case, is used as a low-frequency electrodynamic link in the 35ASDS-017. The head is framed by a decorative ring-shaped trim with four fastening lugs made of coated plastic. On the front panel of the low-frequency block housing, in addition to the head, there is a 70 mm bass reflex hole - the outlet of a plastic pipe 180 mm long. The geometric dimensions of the bass reflex determine its setting at a frequency of 25 - 30 Hz.
The internal volume of the low-frequency unit is 45 liters. To reduce the impact on the frequency response of sound pressure and the sound quality of speakers from the resonances of the internal volume of the housing, the latter is filled with a sound absorber, which is mats of technical wool, covered with gauze, evenly spaced and fixed to the internal walls of the housing. An electric filter is mounted inside the low-frequency unit housing on a steel chassis, providing electrical separation of the low-frequency speaker band from the mid- and high-frequency ones.
The basic electrical circuit of the filter makes it possible to obtain a frequency response decline in the mid-frequency region of 6 dB per octave and a crossover frequency of 500 Hz.
The mid- and high-frequency unit consists of two parts - the power supply and the mid- and high-frequency emitters themselves. Two mid-frequency and two high-frequency electrostatic emitters are mounted on a flat frame mounted on the power supply. Each of the emitters is a thin (5 µm thick) metallized lavsan film stretched between two perforated plates (electrodes) made of foil-clad fiberglass laminate grade SF1-35, coated with 200 µm thick varnish UR231 to prevent electrical breakdown with high polarizing voltage. The polarizing voltage creates a uniform electrostatic voltage between the plates, in which the thin film oscillates (when an electric signal of audio frequency is passed through). Hermetic dimensions of each emitter: mid-frequency 185x165 mm, high-frequency 65x165 mm.
The power supply housing on the board contains:
On the front panel of the power supply there are:
In addition, there is a decorative nameplate on the front panel indicating the name of the speaker and its main technical characteristics.
The front panels of the low- and mid-high-frequency units, as well as the back of the mid-high-frequency unit, are covered with frames with decorative radio fabric.
On the back wall of the speaker unit's LF housing there are special terminals that allow you to connect supply wires to the speakers.
The 3AS-305 acoustic system (GOST 23262-83) has been produced by the Vega Production Association, Berdsk since 1979 (until 1983 it was called).
The acoustic system "3AC-305" is designed for high-quality sound reproduction. The speaker was sold independently, and it was also used to equip household equipment of classes 3-4, for example, Vega-323-stereo radios. The body is made of plywood, the external finishing is natural veneer with transparent varnish. The body is not removable. The speaker system has one broadband speaker 3 GD-40 (5 GDSH-2-4) exactly in the center. A removable frame with fabric is attached to the front, to which the speaker is attached from the inside. On the back there is a nameplate, a mount for hanging on a wall and a cord for connecting speakers
Specifications:
The acoustic system "50AS-022" was produced by the Carpathian Radio Plant (PO Karpaty) in Ivano-Frankivsk. Model 1986.
A three-way speaker system with a bass reflex "50AC-022" provides high-quality reproduction of sound programs complete with high-quality household radio-electronic equipment. In the acoustic system, loudspeaker heads 6GDV-7, 20GDS-3 are used as high-frequency and mid-frequency units; the dynamic head of loudspeakers 75GDN-3 was used as a low-frequency link; There are two smooth tone controls for the mid and high frequencies, allowing you to change the timbre of the sound, respectively, in the ranges from 550 to 5000 Hz (by -6 dB) and from 5 to 25 kHz (by -3 dB). Filter cutoff frequencies are 550 and 5000 Hz. Output power, W: nominal 50, maximum - 80. Reproducible frequency range 25...25000 Hz. Nominal electrical resistance - 4 Ohms. Speaker dimensions - 360x675x330 mm. Weight - 24 kg.
The Kliver 75AS-001 acoustic systems have been produced by the Krasny Luch plant since 1987.
Specifications:
Acoustic systems "Corvette 75AS-001" have been produced by the Leningrad NPO "Okeanpribor" since 1987.
Acoustic systems of the highest complexity group "75AC-001" are designed for high-quality reproduction of music and speech in stationary living conditions. The recommended rated power of the amplifier used in conjunction with the speakers is 10...100 W. The preferred option is to install the speakers on a stand with a height of 30-50 centimeters. The distinctive ability of the speaker is its high sensitivity to low-power signals and at the same time the ability to withstand high electrical power values, up to 300 W. Thanks to this, the speakers operate in an extended dynamic range without distortion. The speakers are designed to reproduce
producing programs from analogue or digital media.
Specifications:
Acoustic system "8AS-220". Model 1982.
Specifications:
Description:
The body is made in the form of a rectangular non-separable box made of plywood. Externally finished with natural veneer and varnished. The loudspeaker is located in the center of the vertical axis, slightly shifted to the top. The front speaker is protected by a decorative round mesh. There are 3 bass reflex holes at the bottom. On the back wall there is a mount for hanging the speaker on the wall.
The 8AS-4 acoustic system has been produced since 1981.
The acoustic system - "8AS-4" is included in the set of the electrophone "Nocturne-211".
Each speaker is equipped with two broadband loudspeakers of the “4GD-35-05” type.
Speaker weight - 7.5 kg.
The active acoustic system "Yauza" has been produced by Moscow Electromagnetic Plant No. 1 since 1992. It is designed for listening to sound programs and works with household radio-electronic equipment that has a linear output (tuners, tape recorders, electronic control units, AF preamplifiers, etc.). The ACA provides volume and timbre adjustment for higher and lower sound frequencies. Power is supplied by a 12 volt AC adapter. AAS characteristics: Reproducible frequency range 180...12500 Hz. The average sound pressure of each channel is 0.25 Pa. The range of tone control for bass and treble (at the PA output) is ±8 dB. Maximum noise power 5 W. Dimensions of ASA - 148x150x230 mm.
Active acoustic systems "Amfiton" have been produced by the Ivano-Frankivsk Production Association "Karpaty" since 1987.
Amphiton active speaker systems are designed to amplify audio frequency signals from portable stereo cassette players, as well as from any other portable or stationary mono or stereo signal sources. In addition to the connector for inputting an audio frequency signal from a tape recorder, each speaker has a connector for connecting an external power source, as well as a connector for direct direct use of the speaker speaker, while the average power input can be 3 W. Accordingly, the frequency range increases downward to 100 Hz. The AAS uses "3GDSH-2-8-140" loudspeakers.
Initially, speakers were implemented entirely on microcircuits.
Specifications:
The three-way acoustic system "Electronics 25AS-033" has been produced by the Leningrad plant "Ferropribor" since 1986.
The household three-way acoustic system with a bass reflex "Electronics" 25AC-033" is designed for high-quality reproduction of music and speech programs in stationary conditions. The recommended output power of the amplifier used is 10...50 W. The preferred type of installation for speakers is floor-standing. The range of effectively reproduced frequencies is 25...31500 Hz. Harmonic distortion over the entire operating frequency band is 1...2%. Short-term permissible power 75 W. Peak power 100 W. Speaker dimensions - 320x610325 mm. Weight 21 kg.
Literature:
The blocknau three-way acoustic system "Electronics 25AS-132" has been produced by the Severodonetsk Resistance Plant since 1987.
The block three-way acoustic system "Electronics 25AS-132" is designed for high-quality reproduction of music and speech programs as part of a stationary radio complex.
Literature:
Description of AS "Electronics 25AS-132"
The Kliver 10AC-232 acoustic system has been produced since 1989 by the Krasny Luch plant.
2-way bookshelf speaker with bass reflex. Reproducible frequency range 63...25000 Hz. Sound pressure in the range 100...8000 Hz - 0.85 Pa. Resistance 4 ohms. Maximum long-term power 50 W. Total harmonic distortion in the range 250...6300 Hz 3%. Loudspeakers: LF - 25 GDN-1L-4 MF/HF - 6 GDV-4-8. Speaker dimensions - 330x208x190 mm. Weight - 5.4 kg. Since 1990, the plant, according to the new GOST, has been producing the Cleaver 50AS-201 AS, similar to the one described. For a short time, the speakers were produced simultaneously.
The Orbita 50AS-125 acoustic system has been produced since the beginning of 1989.
"Orbita 50AC-125" is a three-way stereo speaker system, consisting of one low-frequency and 2 mid-high-frequency loudspeakers. The woofer housing is made in the form of a furniture cabinet on wheels that can be used as a stand for radio equipment. Two 35GDN-1-8 low-frequency heads are placed coaxially, which makes it possible to increase the efficiency of low-frequency reproduction and reduce nonlinear and transient distortions. Mid-high-frequency loudspeakers are lightweight boxes, each containing two heads: 20GDS-1-8 and 6GDV-6-16. Main technical characteristics. The rated power of the woofer is 50, the mid and high frequencies are 2x15 W, the nominal range of reproduced frequencies is 35...200 and 160...22400 Hz, respectively, the level of characteristic sensitivity is -88 and 89 dB/W/m; total characteristic harmonic coefficient of speakers in the range 50...1000 Hz - 2, 1000...2000 Hz - 1.5 and 2000...22 400 Hz - 1%; Dimensions of speakers LF - 520x460x400, MF-HF - 260x150x145 mm; weight 28 and 3.5 kg. The price of the set is 200 rubles.
The Orbita 75AS-3-001 acoustic system was prepared for release in 1988.
"Orbita 75ASZ-001" stereophonic speaker consisting of 3 loudspeakers. Signal components up to 200 Hz are reproduced by one low-frequency loudspeaker, and above 200 - by two mid-high-frequency loudspeakers. The last two can be connected directly to a power amplifier, and the first can be used with the consumer's existing traditional speaker systems to improve the reproduction of lower sound frequencies. On the back wall of the woofer speaker housing there is a regulator that allows you to attenuate the level of reproduced high-frequency components by 4 and 8 dB. Main technical characteristics: Rated power of low-frequency loudspeaker 50 W, mid-high-frequency 2x15 W; range of sound frequencies reproduced by speakers 25...250 and 160...25,000 Hz; nominal electrical resistance 4 ohms; characteristic sensitivity level 80 dB/W/m; total characteristic harmonic coefficient in the AF range: 31.5...200 Hz - 2, 5250...1000 - 2, 1000...2000 - 1.5, 2000...6300 - 1%; speaker dimensions: LF - 800x530x400, microwave - 275x160x155 mm; weight 38/4.5 kg. The approximate price of the set is 250 rubles.
The Riga-101 acoustic system has been produced by the Riga Radio Plant named after A.S. Popov since 1969.
The acoustic system of the Riga-101 stereo radio consists of two sound speakers, each of which has two loudspeakers: a low-frequency (main) type 4GD-5 and a high-frequency type 1GD-3.
Schematic diagram:
The acoustic system "Romantika 50AS-105" has been produced by the Kharkov Shevchenko PSZ since 1988.
The acoustic system "50AC-105" is designed for high-quality reproduction of phonograms in conjunction with existing amplification equipment. Rated long-term input power 50 W. Short-term 110 W. The range of reproduced sound frequencies is 40...20000 Hz. Speaker dimensions - 520x330x265 mm. Weight 16 kg.
Literature:
Operating instructions for the acoustic system "Romantika 50AS-105"
The acoustic system "Electronics 100AC-060" has been produced by the Moscow NPO "Thorium" since 1986.
The acoustic system "Electronics 100AC-060" is designed for high-quality reproduction of sound programs in stationary living conditions. The recommended power of a "Hi-Fi" high-quality household power amplifier is 10...100 W. The preferred installation option for the speaker system is floor-standing. The speakers are made in the form of a rectangular box made of special chipboard 19 mm thick. The side walls are finished with valuable wood veneer, the front panel is painted with black dye. The design has elements that increase the rigidity of the body and reduce the amplitude of wall vibrations. The front panel of the speakers contains controls - HF and MF. The removable frame is covered with fabric with high acoustic transparency. A distinctive feature of the speakers is the use of highly stable metal diffusers in all three strip speaker emitters and polyurethane foam suspensions in two emitters.
Specifications:
The acoustic system "Electronics 100AS-063" has been produced by the Moscow NPO "Thorium" since 1989.
The acoustic system "Electronics 100AC-063" is designed for high-quality reproduction of sound programs in stationary living conditions. The recommended power of a "Hi-Fi" high-quality household power amplifier is 10...100 W. The preferred installation option for the speaker system is floor-standing. The speakers are made in the form of a rectangular box made of special chipboard 19 mm thick. The side walls are finished with valuable wood veneer, the front panel is painted with black dye. The design has elements that increase the rigidity of the body and reduce the amplitude of wall vibrations. The front panel of the speakers contains controls - HF and MF. The removable frame is covered with fabric with high acoustic transparency. A distinctive feature of the speakers is the use of highly stable metal diffusers in all three strip speaker emitters and polyurethane foam suspensions in two emitters.
Specifications:
Literature:
The Elektronika 130AC acoustic system was produced by the Uchkeken Eliya plant, which was part of the Karachay Microcomponent Production Association. Production since 1989.
The acoustic system "Electronics 130AC" (35AC-029) is similar in appearance to the acoustic system "Electronics 35AC-015".
The "Electronics 130AC" speaker is designed for high-quality reproduction of music or speech sound programs in stationary living conditions. Recommended power of a high-quality audio amplifier operating in conjunction with an acoustic system: 20...130 W. The acoustic system is designed to be installed on the floor. The range of sound frequencies reproduced by the acoustic system is no longer 25...35500 Hz. Frequency response unevenness is 4-5%. The input impedance of the speaker is 4 Ohms. Long-term power supplied to the speaker is 130 W, short-term 240 W. The dimensions of the "Electronics-130AS" acoustic system are 350x685x320 mm. Speaker weight 25 kg.
Literature:
Description and diagram of the acoustic system in the reference book.
The acoustic system "Electronics 25AS-126" has been mass-produced by Kazan Production Association "Elekon" since 1979.
The acoustic system is designed for high-quality reproduction of speech and music phonograms in stationary, domestic conditions. The recommended power supplied to the speakers is at least 35 W. The housing of the speaker system is made of chipboard and veneered with valuable wood veneer. There are three loudspeakers installed on the front panel: 35GD-1 (LF), 20GDS-1 (MF), 5GDV-1 (HF), which are manufactured by Berdsk Production Association "Vega". Filters are mounted inside the speaker system on its rear wall to separate the bands.
Specifications:
The "Electronics 25AS-126" speaker is similar in appearance to the "25AS-326" type speaker system, but in design they are different speakers.
Literature:
The acoustic systems "Electronics 25AS-227" and "25AS-027" were produced by the Leningrad plant "Ferropribor" and the Lvov Production Association named after. Lenin Speaker production began in 1985 and 1986, respectively.
Three-way acoustic systems with a bass reflex "25AC-027" and "Electronics 25AC-227" are identical in design, design and parameters. Made in mirror image for aesthetic design. The speakers are designed for high-quality reproduction of music programs as part of a complex of amplification equipment of the highest complexity group. The low-frequency functions are performed by the 25GD-42 head, the mid-frequency 15GD-11, and the high-frequency functions by the 10GI-1 isodynamic head. The magnetic system of this head consists of 2 parallel rows of magnets, and the flat membrane is made of a polymer film on which a voice coil is applied. The membrane provides an inertia-free radiation mode, which made it possible to expand the frequency range reproduced by the head to 31.5 kHz and reduce nonlinear and phase distortions. The speakers are made in enclosures made of special chipboards pressed for acoustic systems and covered with a thin film imitation of valuable wood species.
Main technical characteristics of the speakers:
The Elektronika 25AS-326 acoustic system has been produced by the Kazan Elekon plant since 1981.
The acoustic system is designed to work together with high-end sound reinforcement radio equipment. The audio frequency range is divided into 3 bands 40...500, 500...5000, 5000...20000 Hz using passive electrical filters, which are respectively loaded onto three different dynamic heads: low-frequency - 25GD-26-30, mid-frequency 6GD -6-80 and high-frequency - ZGD-31-1300. The speaker housing is designed in the form of a closed box. The nominal power of the speaker is 25, and the maximum is 35. Watts. The nominal frequency range of sound is 40...20000 Hz. Electrical resistance 4 ohms. Sound pressure with a power supplied to the speakers of 14 W. not less than 1.2 Pa. The external dimensions of the speakers are 480x285x263 mm. Weight 14 kg. Price 135 rubles.
"Electronics 25AS-326", after changes in GOST, became known as "Electronics 25AS-126". The same speaker came complete with the "Electronics D1-012" EF, where it was called "Electronics D1-012". All these modifications were produced by the Kazan plant "Elekon".
The acoustic system "Electronics 35AS-015" was produced by VNPK "Akustika" plant "Microcomponent" in the city. Uchkeken, Zelenchuksky plant "Spiral" and Kazan computer plant. Speaker production since 1989.
The acoustic system "Electronics 35AC-015" is designed for high-quality reproduction of music or speech sound programs in stationary living conditions. The recommended power of a high-quality amplifier operating in conjunction with a speaker system is from 20 to 130 W. The acoustic system is designed for installation on the floor. The range of sound frequencies effectively reproduced by the acoustic system is no longer 25...25000 Hz. Frequency response unevenness 5%. Input impedance - 4 Ohms. Rated input power - 25 W. Long-term input power 130 W. The dimensions of one speaker are 355x685x305. The weight of one speaker is 27 kg.
The acoustic systems "Vega 35AS-105" and "Vega 35AS-105-1" have been produced by the Berdsk Radio Plant since 1989 and 1991.
Frequency range: 50...20000 Hz. Sensitivity: 86 dB. Long-term power: 35 W. Short-term power: 90 W. Recommended amplifier power: 15...35 W. Resistance: 8 Ohm. Speaker dimensions: 460x240x280 mm. Weight: 11 kg.
The acoustic systems "Corvette 75AS-001" and "Cleaver 75AS-001" have been produced by the Leningrad NPO "Okeanpribor" and the "Krasny Luch" plant since 1987.
Speakers of the highest complexity group are designed for high-quality reproduction of phonograms. The recommended rated power of the amplifier used in conjunction with the speakers is 10...100 W. The preferred option is to install the speakers on a stand with a height of 30...50 cm. The speakers are characterized by high sensitivity to low-power signals and at the same time the ability to withstand high power values, up to 300 W. Thanks to this, the speakers operate in an extended dynamic range without distortion. Technical characteristics of the speakers: Effectively reproduced frequency band 25...25000 Hz. Rated input power 35 W. Nominal input impedance 8 ohms. Maximum long-term input power 150 W. Maximum short-term (peak) power 300 W. Type of acoustic design - bass reflex. The dimensions of any one of the two types of speakers are 396x710x355 mm. Weight of AC Corvette - 24 kg, Jib - 40 kg.
Literature:
The acoustic systems "Estonia 130AS-002" and "Estonia 130AS-003" have been produced by JSC "RET" since 1991. Kohtla-Jarve.
Since the beginning of 1993, the Bryansk EMZ has produced the Soyuz 130AS-002 speaker, similar to the Estonia 130AS-002 speaker, except for the midrange and HF level controls, in the ranges from 1 to 5 kHz and from 5 to 25 kHz, respectively, and located at the rear.
The acoustic system "Soyuz 130 AS-002" - meets the requirements of the highest complexity group according to GOST 23262 - 88 and 467286.00 TU and is intended for high-quality reproduction of sound programs in combination with various types of household radio equipment, representing a three-way system with a bass reflex. There are two playback level controls located on the rear wall separately for mid and high frequencies, in the ranges from 1000 to 5000 Hz and from 5 to 25 kHz, respectively. Using the controls, you change the timbre color of the sound. AS "Soyuz 130 AS-002" replaced the well-known model 35AS-021. Rated input power 130 W. Short-term power 200 W. Nominal resistance 8 ohms. The effective range of reproduced frequencies is 40...25000 Hz. Speaker dimensions 282x655x300 mm. Weight 18 kg. The acoustic systems “Estonia 130AS-002” and “Estonia 130AS-003”, similar in design and design, were produced by JSC in the city of Kohtla-Jarve, which were distinguished by the use of a 75GDN-2-8 LF loudspeaker of a cone design, with an original magnetic system, with an additional ring magnet reverse polarity. The parameters of the 3 speakers are almost the same, the maximum noise power is 75 W "Estonia 130AS-002" and 60 W "Estonia 130AS-003" and the levels of characteristic sensitivity differ (87/86 dB, respectively).
Literature:
Acoustic systems "Estonia 35AS-021" have been produced by the Tallinn plant "Punane-RET" since 1985.
Three-way speaker systems with a bass reflex "Estonia 35AS-021" are designed for high-quality reproduction of music programs in stationary living conditions. The recommended power of a high-quality household audio amplifier is 20...50 W. The preferred installation option is floor-mounted. Distinctive features of the speakers are their reduced dimensions, the use of a flat honeycomb diaphragm in the low-frequency loudspeaker and a dome membrane made of polystyrene foam in the high-frequency loudspeaker (all loudspeakers are designed for this loudspeaker).
Specifications:
The Doina-001-100 sound reproduction system has been produced since 1981.
The sound reproduction system consists of an amplification-switching device and two acoustic systems "50AS-D". It is designed to amplify sound signals from a microphone, electric guitar, electric organ, tape recorder, electronic control unit and other sources of music programs, and up to six sources can be connected simultaneously. Main characteristics: Rated output power with a load resistance of 4 Ohms - 100 W. Frequency range with frequency response unevenness ±2 dB - 20...36000 Hz. Harmonic distortion 0.5%. Signal to noise ratio 65 dB. Signal-to-background ratio 70 dB. Power consumption 220 W. Dimensions of the UCU - 500x310x134 mm. Its weight is 16 kg. Price - 1035 rubles. Main parameters of the speaker: Rated power 50 W. Nominal resistance 8 ohms. The nominal frequency range of sound is 63...18000 Hz. Average standard sound pressure in the nominal frequency range is 0.3 Pa. Dimensions of one speaker - 550x285x985 mm. Weight 35 kg. The price of one speaker is 225 rubles.
Small-sized acoustic system "Electronics", 1980.
Brief technical specifications:
Operating frequency range: 100...12500Hz.
Input power nom/max 3/6 W.
Speaker weight: 1.3 kg.
The Escort electroacoustic unit has been produced since 1971.
The electro-acoustic unit "Escort" is designed to amplify low-frequency signals from a dynamic microphone, electric guitar, tape recorder, pickup, radio receiver, radio broadcast line. The "Escort" system consists of a low-frequency amplifier and one front loudspeaker of the 4GD-28 type. The amplifier is made of 9 transistors. Maximum output power 4 W, range of amplified and reproduced sound frequencies 100...10000 Hz. The power supply is universal, from an AC mains voltage of 127 or 220 V and from batteries with a voltage of 9 V. Dimensions of the unit - 350x320x125 mm, weight - 4.5 kg.
Literature:
First, a few terms in case you don’t know them:
HF - high frequency speaker;
MF - mid-frequency speaker;
LF - low frequency speaker;
As I already wrote, I bought the speakers second-hand in order to slightly modernize them and listen to, if possible, the entire range of musical recordings, and not their middle.
It is clear that in your mind you need either large, good speakers, which are expensive, or a “musical” subwoofer, which is also expensive.
In general, I decided to go “my own way” - buy old Soviet speakers and improve them in every sense. The choice fell on Amfiton 25AS-027 due to its relatively small size, sufficient power for any apartment and isodynamics in the HF part. I bought it “blindly” in Zlatoust and made a mistake, but not fatally, because... in the Jobur market everything has been occupied by “hucksters” in all meanings of the word and they charge at least double the price.
These speakers initially have two disadvantages.
The first is the compact size; in order to get low frequencies with such a volume (only 41 liters), the lowest-quality “soft” woofer speaker (50GDN) was installed there, and in order to get “elastic” bass from it, the body needs to be heavily damped. Also because of this, the speed of air flow coming out of the bass reflex is very high and “wheezing/wheezing” can be heard.
The second is the narrow directionality of the sound of the tweeter. I have already forgotten how narrow it is, but I had to remember. It is very desirable that your ears are in line with them. But for this you get clean highs up to 31 kHz, which for many was worth this inconvenience. A more or less wide listening beam is obtained from about 3 meters from the speakers. The funny thing is that according to the instructions, the speakers should be placed on a platform that has an inclination angle of ~15° in order to direct the HF radiation upward, but no one has seen these stands with their own eyes. :))) 
Taking the speakers from a friend who bought them, I listened to them, the only verdict was - “they play, they don’t “rustle” the low frequencies (the coil on the magnetic system) and that’s good.” In principle, I was ready for this, because... I read on the Internet many options for modernization and they all primarily related to two things: the leakiness of the case and the midrange speaker, which was “none” in this column, and it is responsible for the most important part of the sound range, where almost everything that a person hears is located own life. Almost all 3-way (LF/MF/HF) Soviet speakers had a common problem - a poor mid-range speaker. Everyone had different ways of selecting them and matching them with the LF and HF speakers. In this column, the SCH 20GDS-3-8 is, to put it mildly, bad and needs to be changed. There are many replacement options, from one of the best Soviet midrange speakers 30 GDS-1 (found in Cleavers, Corvettes 150AC, etc., etc.) to a wideband speaker, which worked well for us, or replacement with a foreign analogue with unpredictable consequences, because You can't just go and replace the speaker. :)))
I decided to take a chance and choose a replacement myself. I bought a pair of 30GDS second-hand and at Audiomania a Visaton 13/8 mid-bass speaker recommended by many.
Having compared the sound quality of these three copies alone, I chose Vizaton.
20 GDS-3-8- The midrange is shifted to the low-frequency part (rubber suspension) and the clarity/sharpness of sounds is the smallest of the presented speakers. 
30 GDS-1-8 - the midrange range, on the contrary, is shifted to the high frequency part (impregnated paper suspension). The game is sharp and tough, but you can’t overload it, it immediately starts to hiss and make a mess. 
Vizaton 13/8 is a certain sum of the first two plus “transparent” sound." For an ordinary person, compared to 30 GDS, this will be lost money, as they wrote on the Audiomania website: "I took a 25GDS as a replacement in Amfitony, I won’t say that the order is not better than relatives, but these ones have a more open sound, there is no horn effect, they play the highs better, they are the same in sensitivity, and I think there are no better speakers to replace the 25 GDS."
Those. The difference is in the nuances. But the difference between 20 GDS-3 and Vizaton is very significant... for me at least.
Having dealt with the replacement of the midrange, I took up the body. The body needed to be patched because... Having turned on the trance on the speakers with a lot of lows, the case “whistled”, “hissed” and the back wall hummed loudly. According to the recommendations, I filled all the seams with PVA with a reserve, it took 4 days with drying. Then I covered all the walls with guerlain (this is a vibration isolator) which was left over from the “modernization” of the computer case and covered it with wavy foam rubber to remove standing waves. The body stopped humming and decided not to do any spacers.
A few photos from disassembly. 
The time has come to deal with the separation filter, one of the most difficult problems for a person ignorant of them. There is such a range of opinions on this subject on the Internet that it is shocking. :) From "don't touch anything! This was done by professionals!!!" to "Everything needs to be recalculated, but it’s better to throw the columns in the trash!!! Amen." 
Knowing firsthand how and what was in our long-suffering electronics (not military!!!), I decided to take the middle path: try to understand the operation of the filter and configure it as I needed with minimal changes. And when comparing with the circuit in the passport, I saw the differences I expected with the real circuit in the hardware.
I'll drift off to the side a little. In Soviet times, if a conveyor belt was established, it was almost impossible to make amendments, because There are passports and approved technical regulations from which there is “no step”. And that's exactly how it was. It worked on both sides: the customer received a repeatable copy, and the low technical level on the assembly line made it possible to repeat all this in millions of copies. And the developments were done in “all sorts of” institutes, naturally “on the knee” by all sorts of “insane” teams and individuals. Who cares? . It was the same story with the speakers. This is to understand how it was created. I know all this because... My father works in electronics and went through all this himself... and is still faced with it. :)
So there was a problem with these speakers - the isodynamic HF speakers often burned out. because it was strained with cooling, and the membrane material of the “coil” could not withstand the resulting temperature at maximum power and was deformed, and due to the poor midrange link, the mid-frequency range was also “hung” on the HF, and the Soviet people liked to listen at maximum volume. As a result, warranty returns and tweeter repairs became so frequent that they began to look for a way out, but without deviating from the existing regulations with a minimum of costs, because No one will allow high frequency processing, and the necessary material was not available then. The solution was found in installing a resistor in series with the HF speaker and increasing the resistance of the resistor on the midrange. As a result, the high-frequency “burning” stopped, but the sound quality suffered quite a lot. As I already said, a person in this range hears almost any distortion. This is how they “saved” the speakers for production, but the sound was ruined, but they considered it acceptable.
Here is the diagram of the column crossover filter:
There is only one resistor in this diagram, but here is what is actually in the column:
As you can see, there are two of them here and the second one, which is not on the diagram, is connected in series with the RF head to reduce the input power, the resistance is 2 Ohms, the dependence (as I subtracted) is approximately 0.7 Ohms per 1 dB, i.e. attenuation is -3dB, which is quite strong. And let me remind you that it is not shown in the diagram.
What happens to the HF head if it is “raped” for a long time?..
This is the "ideal" that should be 
But this is what happens after violence. 
The entire surface is covered with waves due to thermal stress. BUT this also happens in the new dynamics of the “perestroika” period, when the quality of production seems to have dropped significantly.
I pulled the filter out and began to bring it “to the passport”. I replaced the midrange speaker and removed both resistors from the circuits. I turned it on to listen and, lo and behold, everything became fine. But the mid-high frequency range began to “stick out” to the foreground and their level had to be lowered with an L-attenuator....
After looking through all sorts of crossover options, I settled on this one:
Using the selection method, I selected the required attenuation of the high-frequency and mid-range speakers. I did not attenuate the HF, but made it -6 dB for the midrange.
I also removed the jumper and the grille from the HF head, as a result the HF level still began to stick out, but for now I left it as is and started remaking another speaker. In the second column I found the collector’s passport!
The 25AC-126 speakers were left over from the old player; they were not used much, almost like a museum exhibit. But a couple of years ago they got me hooked on tube sound, there was nothing else (the S-90s were long gone), and so it began.....
I have them like this.
I apologize to the experts if something is wrong, I am writing based on personal feelings. And so, the first sensations were not very good - the absence of lows, and the ear-piercing squeal of the mids, with highs it was simpler. Refinement began, it didn’t all work out the first dozen times, I had to take it apart often and a lot until I got something acceptable.
Now, in order;
We remove the front panel, unscrew the speakers and remove them, carefully. We check their serviceability, I had one 3GD-31 that was burnt, we carefully check the woofer and midrange speakers for clinging to the core with a coil or wedge, we check the quality of gluing of the diffuser and centering washer to the body of the woofer, my centering washer was torn off in places, which sometimes gave an incomprehensible overtone, revealed only by visual inspection of the speaker under “load” with a bass melody, it’s not visible.
Also check the quality of the flexible conductors going to the speaker cone; they break off at the base of the mount; if there is any suspicion, it is better to repair or replace it immediately.
We take out the board with filters, it will need to be redone, we take out the cotton wool, if it was there.
That's it, the box is empty, we inspect it, pour out all sorts of sawdust, shavings and garbage from there. We tap the case with a rubber hammer, listen to it so that there is no rattling, if something rattles, we eliminate it with epoxy glue (cracks, etc.), glue it, fill all the cracks there and the joints of the case along the perimeter with epoxy glue, give it time to harden.
In the dome where the midrange speaker was located, we remove something similar to glass wool (I had this) and throw it away. We take a strip of foam rubber about 1 cm thick and about 5 cm wide and with this we wrap (dampen) the holes of the basket at the midrange speaker (15GD-11A or the new 20GDS1-8), fill the dome without tamping with synthetic padding polyester, 70-80% in volume, solder good copper wires to the speaker, not forgetting the polarity, insert the speaker into the dome with a small supply of wires inside the dome, release the wires with a reserve through the hole at the back of the dome and carefully seal this hole with silicone glue (sanitary silicone sealant), let it dry.
LET THE SPECIALISTS NOT HIT ME ON THE HEAD WITH A SPEAKER, but I soaked the midrange driver’s diffuser with a very liquid solution of rubber glue on kerosene, it began to sound less like an enamel basin. We do the same with the second speaker.
We disassemble the filter board, remember which coil is from which speaker, and assemble it according to the diagram below.
Wires must be good, copper, with a cross-section of at least 2.5 mm2, especially for LF and input.
The values of the elements are indicated in the diagram, all mostly original parts.
We make the L1 coil ourselves, take iron from TVZ, TVK or the like, wind 55 turns of wire from which the original coil was made, select the gap to get the required inductance, I got about 1 mm, fasten everything together, impregnate this structure with varnish or epoxy resin so that nothing would ring. The rest of the coils are "original".
We glue exactly the same magnet to the magnet of the low-frequency speaker, so that they PUSH away from each other, this does not give much, about 1 dB of sensitivity, but it was noticeable to my hearing.
I glued it with two types of adhesives, some of it was coated with Super Moment for quick setting so that it wouldn’t last half a day, some with regular Moment. We eliminate the connector on the rear wall; I used a “direct” connection, plugging this hole with sealant (silicone) and strengthening it with a plug in the form of a fiberglass plate on top.
We put the filter in place and connect it. We line all the walls inside the box with padding polyester 4 cm thick, so that it does not fall under the woofer speaker diffuser, and add a little more at the top (we don’t use “native” cotton wool). We put all the speakers in their places using sealant, and we also fasten the front panels with sealant so that they don’t ring.
If the speakers have small holes in the decorative panel, then it is better not to use them.
As a result of all the work done, the speakers turned out to have a very good sound. The music and pieces of music that I had never listened to before, with the converted speakers, I heard them in a new way and listened to everything with pleasure, in a room about 4.2 x 4.2 m.
But I think from my feelings that for better sound quality, you still need to increase the volume of these speakers, up to 50 liters.
Two more pairs of S-90s were subjected to similar modifications, but there were slightly different points. If anyone is interested, I’ll tell you in another article.
PS. What are called audio wires in the store, and they call it oxygen-free copper at a price of about 50 rubles per meter - in fact, it turns out that copper-plated aluminum is not of the best quality. Take this into account. It can be checked simply; after scraping the copper from the conductors, they turn white.
If anyone has any questions about converting these or similar speakers, please ask them
