That's what I was thinking actually, right after I posted.. but, you're not gonna find too many amps (at least I haven't and I searched for awhile) that have a clean front 150 at 4 Ohms like the JL that aren't either dedicated 2-chs or have have a comparable rear as well. Of course, I could be terribly wrong, wouldn't mind seeing an amp like this as well. I've heard that when people do opt for the rear fill, they only supply their rears with about half or less the power of the fronts. I was considering some XXX or Extremis for my rears but I may not do rears in which case I have 2 150W chans that I'll never use, maybe I'll bi-amp.