XPA GEN 3 buzzing or humm

[silverfoxvtx]

I have had this amp running the same two front speakers for years, now all of a sudden I have a buzzing or humm in the speakers. It’s not very loud but I can hear it when I pause the sound during commercials.
I unplugged the pre-outs from the receiver and unplugged the power from the Panamax and went directly into the wall socket, still buzzing or humming what ever you want to call it.....any ideas?

[Ex_Vintage]

Disconnect the line level inputs from the amp to rule out input cables.

[doc1963]

As mentioned above, disconnect the line level input cables from the back of the amp. If the noise persists, trace your speaker wires to make sure there’s no other cables (especially power cables) crossing their path.

If the noise persists after confirming the above, have you added any new devices lately that use the same AC circuit as your audio components...? If yes, do any of them use an AC>DC wall-wart power transformer...? If yes, you may be getting DC noise being fed back into your AC line.

If your Panamax doesn’t have circuitry designed specifically to eliminate DC offset, try an Emotiva CMX-2 found HERE.

[silverfoxvtx]

I haven’t added any new components, I took the input cables off can’t hear it. I guess the test will be when I put new cables on. Its a place to start lol.   The input cables are from Blue Jeans cables RCA on both ends. Does it make sense have a balanced end and a RCA end? 

[vcautokid]

Jan 17, 2021 17:00:39 GMT -5 silverfoxvtx said:

I haven’t added any new components, I took the input cables off can’t hear it. I guess the test will be when I put new cables on. Its a place to start lol. View Attachment  The input cables are from Blue Jeans cables RCA on both ends. Does it make sense have a balanced end and a RCA end? 

You will not gain any benefit of the common noise cancellation that the Balanced connection would give you as you are running unbalanced at one end. No harm is done if you use an unbalanced connection at one end and a balanced at the other either. Many people do it to connect certain kinds of gear requiring that kind of connection.