Thanks for all the responses. Sorry for not following up, I've been swamped at work and haven't had a chance to enjoy my audio system. Okay, I will answer each of the questions:
1. Plugging the map directly into the wall does not alleviate the problem. I still get the hum.
2. Plugging each of the ExactPower units into the wall rather than into one another does not fix the problem.
3. I have not tried an isolation transformer between my amp and preamp.
4. My system is connect to cable TV. I have disconnected all the cable TV connections and the problem still persists.
It is important to note that this occurs with everything else disconnected and unplugged from the outlet. All I need is the amp and pramp connected and powered on and connected to the speakers.
5. I don't know if it's a ground loop or a 60Hz pickup on an input. One interesting thing is that I just got some Odyssey Mono Amps and when using those to drive my main speakers I don't get a hum at all from the main speakers. I still get the hum from the center and surrounds though that are connected to the EAD amp.
6. I've tried plugging everything into just one of the ExactPower units and the problem is still there.
7. I have tried 3 different pairs/brands of interconnects and the problem persists.
So it seems odd to me that with another map I don't see this problem. Could it be a problem with the amp? If so, how do I go about diagnosing what the problem is if any before I ship this beast to be serviced/checked out.
Thanks again to all who replied.
1. Plugging the map directly into the wall does not alleviate the problem. I still get the hum.
2. Plugging each of the ExactPower units into the wall rather than into one another does not fix the problem.
3. I have not tried an isolation transformer between my amp and preamp.
4. My system is connect to cable TV. I have disconnected all the cable TV connections and the problem still persists.
It is important to note that this occurs with everything else disconnected and unplugged from the outlet. All I need is the amp and pramp connected and powered on and connected to the speakers.
5. I don't know if it's a ground loop or a 60Hz pickup on an input. One interesting thing is that I just got some Odyssey Mono Amps and when using those to drive my main speakers I don't get a hum at all from the main speakers. I still get the hum from the center and surrounds though that are connected to the EAD amp.
6. I've tried plugging everything into just one of the ExactPower units and the problem is still there.
7. I have tried 3 different pairs/brands of interconnects and the problem persists.
So it seems odd to me that with another map I don't see this problem. Could it be a problem with the amp? If so, how do I go about diagnosing what the problem is if any before I ship this beast to be serviced/checked out.
Thanks again to all who replied.