Speaker recovery. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Speakers

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The article describes the technology for restoring the speaker resonator.

If the speaker resonator has come to an end, and there is no suitable size and even more so a new one at hand, you should not send the speaker to the next world! There is a way out!

1) If the resonator is torn, but still in place (remnants), it must be completely removed (cut off, peeled off - eliminated), leaving only the membrane and the metal case with a gap between each other.

2) Next, you need to measure all the diameters:

1. Membrane diameter - No. 1
2. The diameter of the metal case (where the resonator is attached) - No. 2
3. In the case of an egg-shaped speaker, I think everything is clear.

3) Take foam rubber, its thickness depends on the size of the membrane (dynamics)

4) Cut out the foam
"on the outer diameter" is 5-10 mm larger (No. 2), (depending on the size of the speaker and the possibility of its movement (amplitude));
"on the inner diameter" is 5-10 mm less (No. 1), (membrane diameter).

5) Lubricate (impregnate) this foam rubber with Moment glue, and put it under a press with leather layers (to avoid unwanted results).

6) After a day, remove the press, naturally the center has not dried up, but the main thing is that the edges have dried up and therefore they will no longer straighten up, but you will have to caress a little with the center!

It must be kneaded (squeezed) with your fingers until the glue is completely dry (5-7 minutes).

7) Next, we glue the foam rubber first on the membrane from below or from above as you like (but naturally stretch it so that the foam rubber is higher on the membrane), then onto the metal case, and the bend turns out by itself (due to the fact that the foam rubber is wider than the gap between the membrane and metal case).

8) The resonator is ready, but if you want, you can smear the resonator again with "Moment" from above (it will be stronger).

And here are examples of what happens

Speakers - satellites 2x15 watts (auto speakers 8,5 cm) (their working stroke is 11-14mm):

But my subwoofer (its diameter is 20 cm - 8 inches) (its working stroke is 30 mm) before tuning it required 15 watts, and now it needs 60 watts (well, very elastic). Now he is in a box of 27 liters with a "phase":

On it, the system for attaching foam rubber to the membrane is completely different (an experiment, but firmly).

The foam rubber layer is cut along the inner diameter (to a depth of 4 mm), and a membrane is glued (inserted) into the resulting gap.

Authors: Alexander Larin (Dynamik) and Zolotarev Konstantin (*KONSTANTIN*); Publication: cxem.net

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