Dsmoov

i have a sony 600watt 4 cahnnel amp and i went browsing at amp hookup kits today and the only kit i saw for 4 channel amps was for a 1400 watt max. i figured this would be way to much overkill and my amp would sound like crap, is that true? and could i get a 2 channel amp wiring kit to work on a 4 channel amp? i am only going to use the amp to power a sub so i don't care about front and rear sound..... any help would be greatly appreciated