> The installer said that there is a VW supplied amplifier under the
> speedometer console and that I must have blown that. The new stereo does not
> require an
> amplifier so he can just bypass it.

Uh, I don't recall any "VW supplied amplifier under the speedometer console,"
just the brake/clutch reservoir, fuses, and the steering column.  The factory
setup was the Heidelburg(sp?) head unit powering four speakers, so unless the
PO put in an amp, I'd say your installer is mistaken.  I _have_ heard of
people securing amps to the front crush beam, behind the glovebox ...
Your lack of sound / buzziness from some speakers may just be loose
connections at the wiring harness -- lift up the ashtray and check the
connection between your wiring harness and the four leads running to the
speakers.

Best,
d.