I have used alot of the AP series and loved all of them. I switched to the APSM series due to cost and space issue. Haven't finished building my box yet (actually doing it right now), but when I do I will be running my 2 Skar MA-8's with my APSM-1500. Should be playing tomorrow. Seen the 2K, and plan on running 2 of them on 8 MA-8's when I get my license back and have my own car. (Build I'm doing now is going in the family minivan my girl drives, lol). I was very impressed at the weight and overall build quality of such an inexpensive amp. But it doesn't surprise me, Audiopipe is definitely the leader in the "budget" car audio world.