Recently bi-amped my system, and have a moderate to slight ammount of hum. Was wondering what everyone throught was the most effective for eliminating 60hz hum? I've done a lot of research, and found that there are several (Hum-X, Ebtech, DCI, Roll, etc.) small units to insert either in the interconnect path, or the power cord. Any suggestions as to what anyone else uses or thinks is best would be appreciated.