Quote Originally Posted by z1000 View Post
Unfortunately sub is out of equation as RCD310 unit clips all freqencies below 80Hz, plus reducing the boot space wont go well with the other half. Wondering what the max speaker depth for front and rear would be though.
From memory, you have plenty of depth front and rear as long as you are prepared to make some deep spacers up yourself.

I had a sub in the boot of the Tig, but went with one of these in the Passat:



I had to go the Pioneer as it was the only one that would fit, but I am incredibly impressed with it - as were the installers, they were amazed at how good it sounded. In the Tig with more room, you could go the Focul unit which you can get in 8" or 10":



You could actually go two - one under each front seat. I was going to do that with the Passat, but have to relocate the bluetooth module under the drivers seat first.