Anyone tried installing either a set of 6 1/2's or 6 X 9's on the rear doors of their non-bose A4?
 

My setup is currently like this:

Infinity Kappa 50.3cs Components up front
Infinity Kappa 62.3 2-way for filler on rear deck
Nakamichi SP-W120 12 inch sub in sealed box in trunk.

Stock HU
Clarion PEQ460 Parametric EQ
MTX 3-way X-over
(Temporary) Jensen KA-5 Amplifier (My Alpine V12 was smoking.)

So do you recommend a rear-door speaker install?

I have Boston Acoustic Pro Series 6.2s in the rear deck. I prefer them in the deck as you don't
 

have to cut the door pannels. Also, you will get better imaging when the sound reflects off the rear window and over the seats, then when the sound is below the seats in the rear doors. Fit with no problems, and no adapters.

MarkP has... he is the man for Audi installs
 

go here for some hella shots and info...

i'm going to add speakers to my rear doors because i'm lacking some midbass punch from the rear. my stealthbox install required me to remove the rear deck speakers...<ul><li><a href="http://ctny.audiworld.com/mark/a4/system/new/rear.html">http://ctny.audiworld.com/mark/a4/system/new/rear.html</a</li></ul>