What makes an amp hum/ground loop?

It usually is a ground loop mismatch between components. Are your A/C outlets grounded? Did you try cheater plugs (2 prong no ground)? Are both mblocks plugged into the same circuit, if so, is it feasible to plug one into a seperate circuit in the house/apt? Some cables being so sensitive will cause this as well? Did you change cables? So many qestions! Good Luck...Kent

Some amp makers suggest the use of (1) cheater plug on just one of the monoamps. A good way to tie the two monos together is with a heavy duty 1 to 3 a/c outlet adapter cord. Home Depot has a nice 12ga pigtail type. Using one of those you can plug in both amps on one wall outlet. Sometimes it takes alot of experimenting with different powercord positioning. Get an extension cord and plug the preamp into another outlet on a different circuit and listen for change. It can be other things also but moving the preamp to another circuit works alot of the time. Good Luck.

Hey Cspra, Thanks for your comments. However, I mentioned that I was connected directly to the cd player. It has analog o/p's, so there is no preamp. Thanks again for your thoughts. John