Subwoofer hum


New member
Username: Touche6784

Post Number: 1
Registered: Nov-04
I am in need of help. I just got a subwoofer and hooked it up to my receiver and I get the annoying hum that many people seem to get with subwoofers. I have searched to internet a little bit and suppose that the problem is a ground loop problem. I am having trouble isolating it though. I have tried using different outlets, the plug for the sub is two prong so the converter plug won't work, i have tried various configurations of thing being plugged in and not plugged in. I have found that the hum still exists in when the reciever is unplugged with the audio line in unplugged. I am contemplating that the problem may be my subwoofer cable that I am using. Any suggestions?

Bronze Member
Username: Subabu2002

Erode,, Tamil nadu,i... India

Post Number: 17
Registered: Apr-04
hi lee,

the same problem also happened for my sub. also..

i did various changes.. finally i changed the RCA cable(sub to reciver). it had cleared.

do slowly to connect between the sub and receiver.

so,try to change the good wire..

good luck
suresh babu

New member
Username: Touche6784

Post Number: 4
Registered: Nov-04 gonna go to best buy and get a new better sub wire. currently using the cheapest monster sub interconnect. thinking of getting the 300 sw cables. im also wondering if this doesnt work if getting a different power bar would help in addition to some kind of ground loop isolator. i went to to and found tripplite has a surge protector with a feature called isolated filter banks. sounds like it would eliminate ground loops but not sure. i also know monster sells a subwoofer powercenter. i am wondering if either of these would solve my problem if the interconnect is not the problem. the loop isolator is the one made by xitel. i am currently using my computer as my souce of music since i dont have a cd player yet. wondering if this also would help with my problem. thanks again

Spock of Vulcan
Unregistered guest
It sounds like a ground loop problem, but the other thing you might want to try is just moving your sub's audio-in cables around a bit. The sub cable, even if shielded, can pick up interference from other devices (e.g. your TV) and produce a hum. If moving your cable(s) around does not make the hum go away, you'd probably do well to continue to investigate the ground loop problem.

Here is a URL that might help on that:


New member
Username: Touche6784

Post Number: 6
Registered: Nov-04
thanks. i have moved the transformer plugs away from the sub and the cable to eliminate the emitted mag field as a possibility. i do still have the power bar right behind the sub becausei have no where else to put it. but i did try isolating the sub from other electronics and the hum was still there so i suspect the cable or the all annoying ground loop. a bit annoyed because there are so many possibilities in how to fix this problem since there is no one answer. will be trying a ground loop isolator and possibly a new cable.
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