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Date: Tue, 20 Jun 2000 05:23:58 GMT
From: rubidiumnopsamdnet.att.net (Jim Collins)
Subject: Re: Strange Audio Problem


Andreas, All modern car audio amps run at 6 volts DC on each speaker lead. This is done so that higher power levels can be obtained using a simple 12 volt source. (there are two power amplifiers that run out of phase with each other and the speaker sits between them). If you have any type of ground on one of your speakers you will see this behaviour. Be sure you have both speaker leads going directly to the amp and that neither is grounded anywhere. JC In article <LNdNOc8wgT0bFVt=kb9qRh00ZWW0nopsamcom>, TimeRangernopsam.com says... > On Mon, 19 Jun 2000 06:56:46 GMT, Andreas van der Wal <nospamnopsam.se> > wrote: > > >Hello, > > > >I have a 9000 cs (-92) and I have a strange audio problem and > >wonders if anyone has seen this before and perhaps have a > >suggestion/solution? > > > >I resently changed both speakers and stereo. > >The stereo is a Sony CDX 6850. > >The front speakers are DLS C4. > >When I start the engine the speaker cone (correct word?) is sucked down. > > > >I doesn't return all the way until the engine is shut off. This is > >probably what > >gives a very irritating sound (sometimes) like a rattle from especially > >the > >front left speaker. No new cables were put in, the old ones should do > >fine. > >This happens even though the front panel of the stereo isn't attached. > >I don't know if I had the same problem with the old stereo/speakers, > >but at least I couldn't hear it. Is there some sort of vacuum or is it > >some > >other electrical equipment that influenses this? > > > >Thanks, > > > >Andreas > > > I am not familiar with those speakers but it sounds like there may be > a minor short somewhere in the electrical system and it is finding a > ground/earth in the speaker. >

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