Trouble with PAC AAI-GM9

[bw4sale]

Ok, I ordered a PAC AAI-GM9 the other day for my '98 because I had heard how much better my iPod/iPhone would sound through it rather than an FM transmitter or tape adapter. It came today and I speedily rushed out to get it hooked up, but honestly, I'm a little disappointed. The sound quality is not what I expected. Keep in mind that I'm a musician by trade and have done my share of studio engineering, so I'm pretty picky, but my wife could even tell the difference. I expected CD quality sound and it just ain't happening. Everything sounds more compressed. Highs are not as crisp. I have to crank my sub up to make it hit. When you switch back and forth between CD and iPod there is a NOTICEABLE difference. My cables seem to be high quality enough. So, what's up?