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From: jwp@uwmacc.UUCP (Jeffrey W Percival)
Newsgroups: net.auto.tech
Subject: Summary: Car speaker problem
Message-ID: <2003@uwmacc.UUCP>
Date: Wed, 26-Feb-86 20:27:51 EST
Article-I.D.: uwmacc.2003
Posted: Wed Feb 26 20:27:51 1986
Date-Received: Sat, 1-Mar-86 02:13:52 EST
Distribution: net
Organization: UWisconsin-Madison Academic Comp Center
Lines: 32

I complained about my car speaker buzzing with the low notes,
and received a bunch of help and many requests to summarize
(sorry for the delay in responding, but work got busy...)

Problem: Car speaker (Pioneer ts-411) had a raspy noise, correlated
with bass notes.

Possibilities:
1. Bad radio.  I swapped speakers; the problem followed the speaker,
   so the radio is OK.
2. Tear in the cone material.  Visual inspection revealed no 
   obvious flaw.
3. Cone separating from voice coil.
   I peered into the metal housing, to see if there was any gap
   developing between the voice coil and the cone base.  Small
   gaps may be repaired by dabbing a bit of clear fingernail
   polish on the split.  I thought I saw a gap, dabbed it, but
   the problem remained.
4. Warped cone, rubbing on the piston.
   Bingo.  The cone material is a paper-like substance, and
   moisture from the trunk area plays havoc with speaker cones.

There's no fixing this problem, so I'm shopping for new speakers.
Some people recommended speakers with polypropylene cones.  A
membranous material that looks highly resistant to moisture.
All the good manufacturers make some models with this material,
and I think I'll go with that to avoid buying speakers every
two years.

Thanks!
-- 
	Jeff Percival ...!uwvax!uwmacc!jwp