Technical and speculative discussion of amps, cables and other topics.
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Subwoofer hum question.
|Posted on November 18, 2011 at 12:30:28|
Joined: July 24, 2000
I just picked up a REL Storm III subwoofer at a local thift store. A I only paid 45 bucks for this thing, I didnt really expect it to work. When I powered it up the see if it even came on, I was greeted with a very audible hum that faded to almost inaudible within a few seconds. I have not hooked it up to my system as it requires a Neutrik speakeron cable that I am yet to acquire. As I am electonically challenged, can anyone tell me what might be causing this hum and will it hurt anything. As I say, it fades to almost nothing when I hold my ear up close. The screws on the plate amp have signs of having been removed at one point, so someone has been in there. thanks.
|RE: Subwoofer hum question., posted on November 19, 2011 at 19:28:49|
Location: sydney oz
Joined: March 8, 2010
Most probably the power supply elecrolytic filter capacitors are leaky and need replacing. Most of the time this can be physically observed with electolyte leaking from the base of the caps onto the cct board. Best to repair asap before unfiltered ac affects output stage.
|RE: Subwoofer hum question., posted on January 10, 2012 at 17:56:57|
|Hum, or 60 hertz ground loop problems are common with sub's. The problem arises when you have two grounds, one threw your interconnect to the preamp and one threw your power cord, which creates different ground potential's .Try a chassis ground from your sub to the preamp. Take a screw out of both chassis to accomplish this if necessary. Audioquest has sub interconnects with built in ground lugs.|