I bought a new inexpensive speaker wire extension,
and I get a loud hummm...
the new wire is "cloth-like",
instead of the standard flexible plastic,
[and they were inexpensive/cheap]
is it the cloth - or the "cheap"
do you think, is the humming problem?
Twisting not needed for audio freqs. Everyone is just saying, without
knowing the exact setup. I have not seen cloth cord used lately. Audio from
computer can pickup common mode noise with long lines. Need isolation
sometimes. Extension ????? Cloth reminds me of telephone.
I kind of glossed over that, but you're right. Talk about
lately, I don't know that I've seen it used in anything like this
for decades. I don't know where you'd find wire for speakers
that's cloth covered, or even just looks like it's cloth covered.
On 6/14/2013 9:34 AM, email@example.com wrote:
Right now, you'd find cloth covered "speaker wire" on my dining room table.
My daughter has a pair of these headphones:
They have a 1 ft cord attached to the headphones with a 1/8 headphone
jack and then a 3 ft 1/8" headphone plug/socket "extension" wire. Both
of the cords are fabric covered as noted in the description.
My guess is that the OP has a similar "extension wire" for his computer
speakers. I have a 20' 1/8" plug/socket extension wire for my computer
speakers. The speakers sit on wall mounted shelves opposite the computer
and facing out of the room so the sound carries farther.
Granted, my long extension is not fabric coded, but based on the one
that came with my daughter's headphones, they do exist, at least in a 3
Twisted does wonders in reducing common mode interference but
sheilded is better for the application. He needs a standard 1/8'
stereo extention cable - and not a cheap headphone extention cable
(which sounds like what he may have)
On 6/13/2013 11:24 AM, firstname.lastname@example.org wrote:
Per this site, there may be an issue with static electricity and fabric
covered headphone cords. I don't know (and doubt) that your issue is
related to static electricity (i.e. hum vs. crackling) but I'll toss it
out there anyway...
Bad ground somewhere. Probably made worse by close proximity to AC wiring, as
trader4 pointed out, and perhaps also the wire is too small in diameter. What's
the sound source and how is it powered, anyway?
On Thursday, June 13, 2013 8:45:01 AM UTC-7, passerby wrote:
it's a pair of stereo computer speakers,
plugged into the back of the computer, with one light greenish plug
[there is alot of wiring at the back of the computer]
I think I said,
it works fine without using this new extension cord
I know I'm in an area I don't know much about
On Thursday, June 13, 2013 12:56:48 PM UTC-4, email@example.com wrote:
Normally unshielded speaker wire will not cause hum. I'm thinking you have
powered speakers of some sort. That's is to say the speaker is really a s
peaker and an amplifier. If the speakers also have to have power such as a
wall wart or regular cord plugged into an electrical outlet then you do ha
ve powered speakers.
The cable you connect from your computer to powered speakers must be shield
ed. Your new one is most likely not shielded. Replace it with a shielded
The description is not clear, but it sounds like he's talking about an AC
extension cord for the wallwart that runs his computer speakers.
If so he might try reversing the plug. Or using a real power strip.
That doesn't make sense. There was no hum before you added the "extension
cable" so how can the one you're trying to extend be causing the problem?
It sounds to me like the the "extension" is causing the problem since is
what as been added to the set up.
As a test, can you eliminate the original cable and just use the extension?
If you get hum, it's that cable. If you don't, add the original back in and
see what happens. If the hum comes back, try a different extension.
Obviously if the original is hard wired to the speakers, you can't do that.
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