The hum is still there ,I talked to customer service,the problem appears to be poor quality electricity. They suggested contacting Ps Audio, or Richard Grey Power Station for a filter to clean up my power. The nice folks at PS Audio ran thru my problem with me, they think it a amp problem BUT I am sure its not. The hum is only there during peak power usage times of the day, on different circuits on can reduce the hum by 75%. Is there any product anyone has used that will work without costing a arm or a leg?