Kingpin094 said:I am currently using an ATX 230Watt power supply to power a 2Chx100Watt amp. driving 2 6.5" speakers. The PSU that I am using is rated to put out 6Amps. at 12V so it provides more then enough for my needs. It all depends on how much power you want to try to pull from the supply and how much you want to drive from the supply.