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High pitched squealing

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August 19, 2012 8:17:03 PM

Hi,

I just got two Kustom PW50 monitors and I've been using them with my Behringer Xenxy 1202FX mixer (for the meantime until I get something more applicable) and I've noticed that I have a wretched squealing coming from the speakers.

I'm certain that it isn't the speakers themselves because I can plug my iPhone and laptop straight into them with a 1/8"-1/8" cable and there isn't any squeal. And I'm sure that it isn't my mixer because I can plug my iPhone and laptop into it and the sound through the speakers are fine.

I've uploaded a 20 second video of what the squealing sounds like.

http://www.youtube.com/watch?v=d_RyYgusAjU&feature=yout...

I've noticed that it mostly makes the noise when I'm using my mouse, an Apple Bluetooth mouse, however, I also use a cheap Logitech wireless mouse and noticed that it makes the same noise too, so I would assume that it isn't the bluetooth causing it. The noise is somewhat consistent and incredibly annoying.

I've replaced the sound card to a cheap Sound Blaster to just see if that would change anything and it didn't.

I've tried several 1/4" cables, several XLR cables, and several 1/8" cables and I still get the same result each time.

Any ideas? Thanks!

More about : high pitched squealing

August 19, 2012 8:23:13 PM

the cable is probably picking up some stray RF

is everything grounded?
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August 19, 2012 8:27:45 PM

Grounded as in power? The monitors and my computer are all powered with 3-prong plugs. The mixer's AC adapter uses a 2-prong plug.
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August 19, 2012 8:39:29 PM

the cables don't look that great...
have you tried using a wired mouse?
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August 19, 2012 8:43:23 PM

could you make your youtube video public?
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August 19, 2012 8:44:11 PM

Yes, a wired mouse and using Teamviewer I moved the cursor around and made the exact same noise.

I've also tried using XLR cables to connect the speakers and I get the exact same noise.
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August 19, 2012 8:46:51 PM

Whoops, Sorry about that.

The sound in the video is me moving the mouse only for a second and then stopping and then starting to move it again. It also is doing it right now as I'm typing.
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August 19, 2012 8:47:43 PM

are you using a wired internet connection?
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August 19, 2012 8:49:58 PM

Yes, hard-wired with ethernet.
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August 19, 2012 8:51:47 PM

try turning your system volume from your computer to the max and compensate with the mixer
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August 19, 2012 8:54:40 PM

It's maxed out and I've tried the reverse as well and it still doesn't change it :/ 
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August 19, 2012 8:58:18 PM

Gigabyte GA-EX58-UD3R
Intel i7 920
6GB of DDR3 Ram
1TB HDD
and I've tried both the built-in audio and a Creative Sound Blaster sound card as well
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August 19, 2012 9:02:04 PM

can you plug another pair of speakers into the mixer?
another mixer into the same speakers that you currently have?
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August 19, 2012 9:04:31 PM

When I put my headphones and my other set of speakers into the mixer, it's gone. And when I plug my iPhone or laptop directly into the 1/8" jack on the speakers, it's gone.
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August 19, 2012 9:06:23 PM

it looks like its coming from the cable running from the mixer to the speaker
is it as short as possible and away from an outlet and/or other cables?
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August 19, 2012 9:08:44 PM

Well I've tried multiple cables, the standard 1/4-1/4 squeals, an XLR to XLR squeals, and a 1/4 to 1/8 squeals too. All the cables except for the XLR are 6ft and the XLR is 10ft. And none of the cables are physically touching.
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August 19, 2012 9:10:33 PM

what area do you live in?
you can be general
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August 19, 2012 9:14:50 PM

Massachusetts, about 45 minutes outside of Boston. I'm certain that it isn't my mixer because I use this with 4 XLR mics and it's fine, never heard this noise before.
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August 19, 2012 9:17:53 PM

if you are willing to drive there might be a place to buy cables
how far are you willing to drive?

what cable combos can you use between the speakers and the mixer
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August 19, 2012 9:20:11 PM

I've got just about every cable I would need, but there's a lot of places I can get cables at.

The mixer has 4 XLR inputs, 8 1/4" inputs, 5 1/4" outputs
The speakers have on each, 2 XLR inputs, 2 1/4" inputs, 1 1/8" input, and an XLR in/out that you can chain multiple speakers together with.

And I've got just about every adapter imaginable as well, 1/4-1/8, 1/8-1/4, XLR-1/4, 1/4-XLR, etc.
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August 19, 2012 9:24:31 PM

have you tried putting a quality choke on both of the speaker cables?
assuming L+R setup
what is the impedance of the speakers? is it matched with the mixer?
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August 19, 2012 9:25:24 PM

I haven't tried today. I don't have at my house, but I do at my studio. Do you think that's worth a shot?
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August 19, 2012 9:29:30 PM

Wixdfast2 said:
I haven't tried today. I don't have at my house, but I do at my studio. Do you think that's worth a shot?


yes
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August 19, 2012 9:29:50 PM

Alrighty, well I appreciate your help. Thanks
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!