RE: Original 58 bozak .. Pristine. Do I mod it

Speaker Asylum

General speaker questions for audio and home theater.

Posted by unclestu (D) on April 4, 2014 at 11:46:15

In Reply to: Original 58 bozak .. Pristine. Do I mod it posted by ffran9 on April 4, 2014 at 00:47:03:

As Lederman suggests: the electrolytics in the crossover have certainly drifted: Change them They are in the black box and are stacked inside.

The other Issues I have had with older Bozaks are several:
earliest Bozaka used a paper cone for the midrange, and then switched over to aluminum. The painted black aluminum mids have a foam rubber dampener under the dust cap.

In several units, I have found that that mid drivers suffer from limited movement because the foam has hardened. You can assess this by gently pushing the cone at the edges and then at the center and evaluating the range of movement.

If stiffened, you can cut out the dust cap, and find a cardboard blank across the VC gap, which you will also have to carefully cut out. Remove and vacuum the foam out and replace parts. You can use aftermarket dust caps with little issues.

In higher humidity areas, I have found the woofers to be slightly hydroscopic. They absorb water and become "soggy", Again you can assess the condition by pushing gently against the cone in various locations. If the cone only moves in the spot being pushed, you have issues, as it not moving in a pistonic motion.

I use Min Wax wood harderner to brush the cone. It is water like in consistency and a little goes a very long way. It will seal the cone and stiffen it significantly. A clear fluid, it dries invisible. One application or coating is enough in my experience.

Good luck

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Follow Ups Full Thread

Topic - Original 58 bozak .. Pristine. Do I mod it - ffran9 00:47:03 04/04/14 (10)

RE: Original 58 bozak .. Pristine. Do I mod it - SgreenP@MSN.com 05:10:31 04/05/14 (1)

RE: Original 58 bozak .. Pristine. Do I mod it - briggs 08:01:21 04/05/14 (0)

RE: Original 58 bozak .. Pristine. Do I mod it - unclestu 11:46:15 04/04/14 (2)

RE: Original 58 bozak .. Pristine. Do I mod it - Retipper 13:53:06 04/04/14 (1)

RE: Original 58 bozak .. Pristine. Do I mod it - RoyJ 16:06:08 04/04/14 (0)

RE: Original 58 bozak .. Pristine. Do I mod it - Retipper 11:32:58 04/04/14 (2)

RE: Original 58 bozak .. Pristine. Do I mod it - ffran9 20:08:41 04/04/14 (1)

RE: Original 58 bozak .. Pristine. Do I mod it - Retipper 20:30:19 04/04/14 (0)

RE: Original 58 bozak .. Pristine. Do I mod it - Hornlover 08:04:26 04/04/14 (0)

RE: Original 58 bozak .. Pristine. Do I mod it - Diogenes 05:20:26 04/04/14 (0)

Follow Ups

RE: Original 58 bozak .. Pristine. Do I mod it - unclestu 11:46:15 04/04/14 (2)

RE: Original 58 bozak .. Pristine. Do I mod it - Retipper 13:53:06 04/04/14 (1)

RE: Original 58 bozak .. Pristine. Do I mod it - RoyJ 16:06:08 04/04/14 (0)

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