Pioneer DEH 9400, Focal 6.5 components and tweeters in the front and JBL's in the back and 10-inch Kicker Bass Station powered sub in the trunk for super easy removal if space is needed. Thought about adding an amp, but I just downloaded the new Soundgarden and Diamond Rings albums and I am very happy with the sound. This is the first time I will have to admit that the iTunes downloads sound just as good as a CD. HU volume goes up to 50 and 35 is plenty loud, with rumbling bass and no distortion in the mids and highs. No clipping until volume around 45, so I may forget adding an amp for now. I wouldn't call it audiophile grade by any stretch, but short of adding another grand to achieve that status, I am pretty satisfied.