Audio problem !

If the eq is an external piece you may have a ground loop. Try a 3 to 2 ac adapter it will eliminate the ground from the eq. test the eq with something else to make sure there is no problem with the eq itself.

It hums because it doesn't know the words (I crack me up).

Do you mean physical hum at the unit or audio hum through speakers?

BTW: no make or model number info came through with your post.

Disconnect the input(s) and see if it hums in the absence of an audio source. A bad audio cable shield or unwisely-routed audio cables will allow entrance of unwanted signals from external power sources, magnetic fields, even dimmer-controlled track lights. Sometimes, simply reversing the orientation of the ac power plug can eliminate humming.

Reverse the cables Left to Right to see if it stays with the cable or the input channel. Follow it back to the source, isolating in the same manner. Eventually you will find the entrance point of the hum. Freqquently a cable

Is the hum in the receiver-attached speakers or the sub?

Self-powered sub?

How is the sub attached - RCA or speaker-level?

Disconnect the input(s) and see if it hums in the absence of an audio source. A bad audio cable shield or unwisely-routed audio cables will allow entrance of unwanted signals from external power sources, magnetic fields, even dimmer-controlled track lights. Sometimes, simply reversing the orientation of the ac power plug can eliminate humming.

If it hums with the sub attached, unplug the sub's power cord. Differences in AC ground potentials will generate hum across linked devices.

Disconnect the input(s) and see if it hums in the absence of an audio source. A bad audio cable shield or unwisely-routed audio cables will allow entrance of unwanted signals from external power sources, magnetic fields, even dimmer-controlled track lights. Sometimes, simply reversing the orientation of the ac power plug can eliminate humming.

Teach it the words ;-)

"OFF"? Turned off, no power?

Register and download the manual for free at retrevo.com

http://www.retrevo.com/support/Polk-Audio-RM6750-Speaker-Systems-manual/id/2771dj580/t/2/

Disconnect the input(s) and see if it hums in the absence of an audio source. A bad audio cable shield or unwisely-routed audio cables will allow entrance of unwanted signals from external power sources, magnetic fields, even dimmer-controlled track lights. Sometimes, simply reversing the orientation of the ac power plug can eliminate humming.

Make sure none of the cabling passes near the TV or any source of high electromagnetic fields. If you have track lighting, turn it off.

Get the TV-related audio digitally from the cable box instead of analog via the TV.

check you sound option in sound settings menu sound settings region ie i or b or auto mike shure u on i

mute the inbuilt speakers you can hear the sound from the external speaker

you need to go to asio config and open the controls tab and mute the first two channels on the left hand side you will hear your music without the humming noise.

try another speaker on that channel if you get no sound or it hums then it is time to take your set to a tech your audio out put on that side is damage along with some caps.good luck.