Has anyone used Pro Sound power amps in their system? I had not considered one until I saw that SVS offers them for their unpowered Subs. My old 300 W/Ch Dyna 416 died recently and I am looking for a replacement since my spare power amp is marginal for subwoofer applications at high levels. I will also be using it to power a pair of passive subs ( 4 ohm impedence) so they will not be working above 80 HZ. You can get a lot more power for the $$ in to 4 ohms ( and they are also rated at 2 ohms) than in an "audiophile" amp. A local pro sound dealer recommended QSC Audio amps over the Samson that SVS sells and lower priced CE series Crowns ( he carries them all) for this application stating they are very clean sounding and would very well. I am looking for 450 - 600 W/Channel in to 4 ohms since the subs I have will take it.