Join Date: Jun 2011
Location: Colorado Springs
Alpine amps aren't known for clean sound. Rather, they're known for hyperbolic claims of power based on peak output and not RMS.
Also, do you have Rockford woofers installed in your enclosure? If so, you're golden there. But if you've got some cheap woofers installed, that would also cause distortion problems.
First, I would recommend replacing your Alpine amp with something from Rockford or Kicker. Don't worry about output numbers. A 40 Watt amp from Rockford or Kicker will stomp all over a "200 Watts!" amp from Alpine. Kicker and Rockford outputs are based on RMS, and not peak like other amps.
Also, what kind of head are you running? Again, if it's something that's not putting out a clean signal, you'll get distortion.
Based on the objectives you listed in your post, you need a head and an amp with very low harmonic distortion. Focus on that rather than peak power output and I think you'll be very happy with the sound you get.