Subwoofer hum

[wilbersdad]

Hi all,

I am currently running a pair of Klipsch speakers and a RSL Speedwoofer all from the speaker level inputs on my Emotiva amplifier(no sub inputs). I am getting a hum from the subwoofer that gets louder as I turn the amp volume up. I’m guessing it’s a ground loop issue and I wanted to get some feedback on a solution. Would it work to splice into the sub woofer cables and make it into Amplifier——>speaker cable——>RCA——>RCA 2 to 1—>isolation transformer——> RCA 2 to 1—->RCA——>speaker cable——>sub

Any help would be great. Couldn’t find much on the web about this scenario.

 

[Lavane]

If the power cords on any of your equipment has to two prongs try flipping them 180° in the socket. Older equipment have two prongs that are the same size. Sometimes flipping them can eliminate ground loop problems. Does it hum without the speaker wires from your amp or receiver connected?

 

[whoaru99]

Hi all,

I am currently running a pair of Klipsch speakers and a RSL Speedwoofer all from the speaker level inputs on my Emotiva amplifier(no sub inputs). I am getting a hum from the subwoofer that gets louder as I turn the amp volume up. I’m guessing it’s a ground loop issue and I wanted to get some feedback on a solution. Would it work to splice into the sub woofer cables and make it into Amplifier——>speaker cable——>RCA——>RCA 2 to 1—>isolation transformer——> RCA 2 to 1—->RCA——>speaker cable——>sub

Any help would be great. Couldn’t find much on the web about this scenario.

If you are meaning to combine the left and right speaker outputs from the amp into a single connection, that generally causes bad things to happen to an amp. Best case, activates protection circuits. Worst case, you need an amplifier doctor.

 

[slimecity]

I agree - try plugging only L or R into the sub at a time, see if the issue remains.

Also try not to run earthed and non-earthed equipment from the same powerplug.

If all else fails - I'd look at running the sub input thru an audio isolation transformer to see if that works. These can range from cheap to expensive.