After 5 years of just OK sounds in my Z3 (2001, 3.0L, 5-speed, Black/Tan, M-sport upgrade, 85k miles) I have just finished a new stereo install. I built a custom sub enclosure for the 8" JL 3W3 sub and used Hertz speakers for the front and rear. I ran all of this with a Pioneer AVH3500NEX with a...