I'd like to swap out the factory Concert systems and replace them with MBQuarts. I would like to just replace the four four inchers for now but which will work best? (Of course "best" is relative when discussing speakers) Autobahn series or Referenz, and which Referenz? Can't seem to find a place to audition all the sets so I'll have to make an educated guess. Any help would be appreciated. Also as to possible mail order sources.

I have the following:<br>* Autobahn QM 2213 CX (5 1/4" component) for the front<br>* Autobahn QM 1216 KX (6 1/2" coaxial) for the rear<br>* Audi A4 QM Speaker adapters, rear and front ($35 front, $44 rear)<p>Autobahns are the recommended speakers as stock speaker replacement, especially if you're keeping the factory head unit in.<p>NOTE: Contrary to what the MBQuart web site and Brian Sherman of MBQuart USA say, the rear speaker adapters for the A4 are for their 6 1/2" speakers. Yes, I'm sure -- I have them. I bought the 5 1/4" coax Autobahns first, and once I found out that they do not fit, I ordered the 6 1/2" speakers instead. I still have not installed the speakers (I'm waiting for the 6 1/2" speakers to arrive).<p>Apparently, you cannot order MBQuarts via mail/phone. I did ask MBQuart that question, and they said they do not sell their speakers to mail order companies. I ended up ordering them via the local dealer. Sorry!<p>

NT<br>