I installed this on
BMW 650i

Review
This Audison AV 1.1 were given to me for my birthday early last year, and I am definitely loving every single ride out with these turned on. They sound perfectly awesome in delivering extremely low tones without any nonsensical distortions whatsoever. I now enjoy every single ride to work in the morning, with its loud undistorted tones, along with delivering fantastic low tones.

What I like
Gives a really balanced tone to my stereo system.

What I do not like
May need to visit the professionals to tune it better. I've heard a good combination of sounds before!