Amps are weird unlike speakers/head units. If you can get the true output specs, then one that puts out a regulated 4x50 at x s/n is pretty much the same as every other regulated 4x50 at x s/n. However, getting the true specs is (or rather was) virtually impossible to do. Zapco amps are well known for being underrated while Pyramid, Pyle, etc are known for being WAY overrated. This amp has achieved CEA-2006 certification. That alone means that 4x50 at 4ohms was a clean output so I would say if you like the design, you wouldn't be disappointed in performance. Installation is supposed to be a snap as well.1COOLPC said:Are they crap?