Sound audio complex. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Audio equipment

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I submit to the readers' judgment the sound complex developed and manufactured by me, or rather the sound audio complex.

I will start my story from afar and with some explanations. I started designing radio equipment in the mid-60s of the last century. In the early 70s, a comfortable, for those times, restaurant "Berezina" was built in the city of Borisov. A professional vocal and instrumental ensemble worked in this restaurant. So this ensemble worked on radio equipment, which I completely made. At that time, it was difficult to purchase high-quality radio equipment: amplifiers, speakers, etc. The tube sound amplifying equipment I made at that time worked almost 24 hours a day and, most importantly, without fail.

Since those distant times, I have pursued the goal of creating sound equipment that allows the listener to experience the effect of full presence at the performance of a musical performer. Since then, I have assembled over 100 low frequency amplifiers of varying power and complexity from 1W to 300W, on a variety of elemental bases, from lamps and transistors to devices completely on microcircuits. It was possible to get the effect of surround and high-quality sound when playing high-quality stereophonic phonograms, but no more.

One day in 1999, while attending a concert by VIA Pesnyary, I came up with an unexpected solution to this problem. Shouldn't I create sound equipment using the method of a vocal-instrumental ensemble? That is, the voice equipment separately, and separately for the instruments. I will not describe how much I had to work hard to bring this idea to life. A huge amount of special literature on this topic was re-read, many experiments were carried out. In 2000, I achieved what I aspired to. On the sound audio complex, consisting of six low-frequency amplifiers and eight sound speakers, I was virtually present at the concerts of the Beatles, Pesnyary, etc. I have developed low-cost amplifying equipment that allows you to get the effect of the listener's full presence in the performance of a piece of music when playing back high-quality stereophonic phonograms. The musical experts invited by me to audition unanimously declared that a live performance practically does not differ from a performance on a phonogram, I emphasize again, a high-quality stereophonic phonogram.

Fig.1. Structural diagram of the audio complex

The following equipment was used for playing phonograms: a reel-to-reel tape recorder "Astra 106 stereo" of the first class, a vinyl disc player of the highest class "Radio engineering", a player for playing audio discs "Thomson", a computer 52-speed CD-ROM. With all this playback equipment, the amplifiers designed by me matched in the best possible way. The block diagram of the audio complex is shown in Fig. 1. Six amplifiers were united in two cases. High-quality stereo voice amplifier (Fig. 2) in one package, with deep frequency response control for high and low frequencies and separate gain control for each channel.

Fig.2. Schematic diagram of a voice stereo amplifier

The other cabinet contains four bass amplifiers containing four final effects and four pre-amplifiers. These amplifiers (Fig. 3 and 4) do not have any frequency adjustments, more precisely, they have fixed adjustments for high and low frequencies.

Fig.3. Effects preamp circuit diagram

Fig.4. Schematic diagram of the final effects amplifier

Fig.5. PSU schematic diagrams

The loudspeakers are located from the floor plane at a height of 2,5 meters. Loudspeaker brands are presented in Table 1.

Table 1

1st speaker	6GD2, 6GDV-1-16 (4 Ohm)
2st speaker	4GD-53A, ZGDV-1-8 (8 Ohm)
3st speaker	5GDSH-1-4, 2 pcs. (8 ohm)
4st speaker	5GDSH-1-4, 2 pcs. (8 ohm)
5st speaker	6GD2, 6GDV-1-16 (4 Ohm)
6st speaker	5GDSH-1-4, ZGDV-1-8 (4 Ohm)
7st speaker	5GDSH-1-4, ZGDV-1-8 (4 Ohm)
8st speaker	5GDSH-1-4, 2 pcs. (8 ohm)

The cubic volume of the room, in which an audio audio complex can be installed with the given parameters of bass amplifiers and loudspeakers, can be in the range of 80 ... 10000 m³. The approximate location of the loudspeakers is shown in Fig.6.

Fig.6. Approximate speaker placement

Schematic diagram of the 2nd loudspeaker is shown in Fig.7. The manufactured sound audio complex was tested according to a special program, no failures were observed.

Fig.7. Schematic diagram of the 2nd loudspeaker

For those who want to make a complex, I will provide more detailed information on manufacturing and commissioning.

Author: A. Gaiduk, Borisov; Publication: radioradar.net

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