Alteration of the acoustic system 35AC-1. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Refinement of the acoustic system 35AC-1. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Speakers

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Listening to music on my 35AC-1, every day I was more and more tired of their sound. I have long heard about the completion of the AU, but for some reason I did not pay much attention to it before. But then I decided to try it anyway. Climbing on the Internet, I found a lot of information about the modifications of 35AC-212 (S-90) and 35AC-1, and I got down to business.

Refinement of the acoustic system 35AC-1. Acoustic system 35AC-1

1. Case

The first thing I took apart was the speaker system. I unscrewed the front panel, dynamic heads, took out the cotton wool, removed the filter and the phase inverter.

Refinement of the acoustic system 35AC-1. Photo of disassembled 35AC

Then I strengthened the back wall of the box by installing two rails through the entire body with a thickness and width of 20mm and a spacer (see photo), closed the holes on the front panel where there was a glass from the mid-frequency head, high-frequency head and switches. I hammered plywood with a thickness of 10mm PVA glue. In place of the glass, I cut out new holes for the midrange and tweeters. (see photo). I put a plastic cup (similar to the S-90) on the midrange, but it's usually better to put a wooden one. Inside, I glued all the walls with 18mm foam rubber (I didn’t find felt), but before that, I need to lay the wires of the HF and MF heads under it (I didn’t do this, I hurried). The phase inverter was shortened by 10 cm by tuning it to a different frequency (less mumbling) and also glued it with foam rubber on top. The drawer is lined with black fabric.

Refinement of the acoustic system 35AC-1. Photo 35AC

2. Filter

I started by throwing away the tone switches and unnecessary resistors, for this you may need a circuit (it’s not hard to find on the Internet). After that, I moved all the filter details to a wooden plank of 8mm plywood. Inductors are not recommended to be welded, they must be taken with glue. I soldered all the connecting wires of the filter to an audio cable (at least the cheapest one) Soldered the wires that lead to the heads directly to the filter and not through each other. On the woofer, a thick wire of at least 2 mm², on the midrange is not thinner than 1,5mm², and 1mm² on the high-frequency head (in the photo, the wires on the midrange and high-frequency heads are thin, I wanted to try and put what it was, later replaced it).

Refinement of the acoustic system 35AC-1. Filter 35AC

The filter is screwed onto the bottom wall of the speaker.

3. Vata

From one sausage that I took out from the ace, I sewed a square-shaped pillow and threw it on top of the column. On the other, I made a small pillow (approximately 0,5 sausages) and put it on the bottom on top of the filter.

Finalization of the acoustic system 35AC-1

4. MF

I didn't have any mid-range speakers. I put 10GD-34 only after finishing it (gluing a cap from a tennis ball, I also found an article about this refinement on the net), and also closed the windows in the diffuser holder of the head with foam rubber. I glued the glass from the inside with felt and filled it with cotton wool.

5. Final part

Soldered the dynamic heads while maintaining the polarity of the inclusion. Dynamic heads screwed through rubber gaskets. Turned on the music and began to enjoy a completely different sound. I myself did not believe that my 35AC-1 could play like that.

P.S. I advise you to remake one speaker first, so that you can compare the sound of one and the other speaker system. If you have any questions or advice write!

Author: Sashakorch [dog] mail.ru; Publication: cxem.net

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