Miata Mailing List: February 1995, Message #153
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   From: "Jyri J. Virkki" 
Subject: Re: loudspeaker question
   Date: Fri, 3 Feb 1995 13:53:07 -0500

Once upon a time RHULL@PALVX.NMSU.EDU said:
> 
> Put in all the Clearwater speakers and am very happy - wish
> I had done this sooner.
> 
> But this did not solve a problem I was having with the passenger
> side door speaker; it rattles or distorts on some low tones.
> The sound is like a torn cone or a dirty connection. The original
> factory speaker, and of course the Clearwater, are intact - no
> cone problem or rubbing of the coil. I cleaned the connection at
> the radio when I installed the headrest speaker wiring. What is it?
> Could it be a problem with the stock radio output transistor?
> 
> I think I can distinguish the various sympathetic resonances of 
> things in the door, but the problem sound doesn't go away if I
> push on or dampen the door panel. So has anyone had to fight
> something like this? Would you recommend pulling the door apart
> and adding damping material?

Interesting.  I occasionally experience what sounds like the same
problem with low frequencies, and only on the passenger side door.  I
have an aftermarket stereo and a good external amplifier, so I know
the signal is definitely not being distorted.  I currently still have
the stock speakers, so I just wrote it off as "lousy speakers, it'll
disappear when I put new ones in".  If you experience the same with
aftermarket speakers though, sounds like it could be a resonance
problem in the door trim itself.  Now, why *only* on the passenger
side door?!  Don't know.

-- 
Jyri J. Virkki - Linux: Choice of a GNU Generation - DoD#0561