How do you like your US Amps USA-600X...i was thinking of buying this amp to run some small wattage subs...300w rms each subs...how does your 600x perform?? any problems with it??...and what is a nice price to pay for one of these amps?? i am guessing its around $300...what colors do they come in?? black & chrome...here is what i know about the amp...it does 600w rms x 1 @ 4 ohms brigded and has a fuse rating of 75A...15" long...i think it can accecpt max of 4 guage not sure though...crossovers..2 channel...i have to run this amp at 4 ohm load...so i wanna get 600w rms out of it...whats its max output at 4 ohm??..any help will be great..thanks