Well, went today to setup a small party tonight(just backround and slight upbeat drinkin music) and plugged the amp in and fired it up and, there is a constant hiss or humm that comes from the speakers, it's more like static. Luckily tonight i can use the backup and underpower them and still be able to get the job done. But i need a new amp!!! I am looking for something that has about 600w @4ohm. I haven't started looking yet, but i thought i'd see what you guys got to say, maybe save me a little bit of a headache. Any replies would be appreciated.