[200q20v] Besides Claire...other source for rear Bose amps?

[Vztante at aol.com]

Howdy folks!

My rear driver's side speaker has been intermittent in it's output ever since 
I purchased the car a couple of months ago.  Yesterday I heard the dreaded 
buzz and pop.

Time to replace it.  The PO had already replaced the other.  I recall having 
read about somebody who specializes in replacing Bose amps, and I even 
checked out their web-site about a year ago.  The address has somehow been 
misplaced.  Can you help?

I could also use some pointers on how to properly unplug and remove the unit.

TIA,

Mitch Frey
'00 A6 2.7t
'91 200tq20v IA Stage 3