moderate wattage 2 channel amp choices that is CLEAN

[speed limit]

At 80 mph SQ is piss poor at best with whatever amp. We are running around on bikes with a ton of ambient noise to contend with, didn't need to spend three times the money for a BT4180 over a SSPN4.1000D. I did buy the BT  7.1's during the Xmas sale wouldn't have paid retail for them over Infinity 602's though. Hell I worked on a flight line for ten years and have been on bikes, street and dirt, for over forty years I'm half deaf anyway.

can't find a class D CDT amp

[ridingonair]

Likely don't make one in any size. As I said CDT is audiophile stuff. Class D while more efficient doesn't produce the sound quality a well built class a/b all can.