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#142185 - 06/21/06 04:32 PM High Pitched Hum...
inthedeck Offline
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Registered: 03/22/06
Posts: 164
I have read threads about ground loop issues, etc. However, this doesn't happen when I have a sub in the mix of things. Currently, I just have the M80's, and a VP 150 hooked up to my HK AVR, and when there is nothing playing, there is a high pitched hum coming from the speakers. Anyone know what I might try? Maybe removing the banana plugs (from Axiom) might help -- i.e. just going to bare wire?

Any other suggestions would be highly appreciated. Thanks in advance.

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#142186 - 06/21/06 04:37 PM Re: High Pitched Hum... [Re: inthedeck]
bugbitten Offline
connoisseur

Registered: 04/06/05
Posts: 2339
Loc: Madisonville, KY
Mids and tweeters? Or tweeters only?

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#142187 - 06/21/06 04:38 PM Re: High Pitched Hum... [Re: inthedeck]
pmbuko Offline
shareholder in the making

Registered: 04/02/03
Posts: 16437
Loc: Ben Lomond, California
A poor speaker connection wouldn't reveal itself as a high-pitched hum, so I highly doubt the banana plugs are to blame. What I'd do in this case is disconnect components from your amp/receiver one at a time (turning off the amp/receiver first, of course) until you find the one that is causing the hum.

But before you even do that, I should ask if the hum is audible at all volume levels and with each input selected.
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#142188 - 06/21/06 04:41 PM Re: High Pitched Hum... [Re: pmbuko]
bugbitten Offline
connoisseur

Registered: 04/06/05
Posts: 2339
Loc: Madisonville, KY
I agree. Change inputs ( DVD to CD or TV ) with nothing playing to see if the hum continues.

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#142189 - 06/21/06 05:04 PM Re: High Pitched Hum... [Re: bugbitten]
inthedeck Offline
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Registered: 03/22/06
Posts: 164
Will try...once I get home. Thanks for the responses...but I am not sure which of the three it's coming from. I will unplug the center, and see if the fronts are humming, and vice versa (ie take out the center, and keep the fronts).

See ya...on my way home now...

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#142190 - 06/21/06 09:49 PM Re: High Pitched Hum... [Re: inthedeck]
ratpack Offline
connoisseur

Registered: 04/30/05
Posts: 1155
Loc: Alabama
I really don't think that it is your banana plugs. Try what the other have posted and I think that you will find that it was some sort of ground loop. They can be quite tricky.
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The Rat. M80s, VP-150, QS8s, SVS PC 20-39+, OPPO, Onkyo 703s, Harmony 880 Sony 60" SXRD HDTV

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#142191 - 06/23/06 10:42 AM Re: High Pitched Hum... [Re: ratpack]
inthedeck Offline
veteran

Registered: 03/22/06
Posts: 164
Still haven't tried any 'tests' on the system. Wednesday evening was quite tough, since I had to move stuff out of the old place, before the closing on Thursday. Then, Thursday took most of my day, while attempting to store all the empty boxes that we seem to have collected, during our move. Also closed on the old place yesterday, which took most of my day...whatta nightmare.

I did manage to wire everything up, and all the speakers are now wired...but I have not had a chance to do much testing with the components that are hooked up. I still have yet to mount the surrounds.

Once I have the system calibrated, and the 4 QS8's mounted, I will test the connections that are going to/from the receiver. Needless to say, it's been a really hectic couple of days. Basically, I am just glad that we closed on the old place, and are basically all moved into the new place. Talk about a relief!!!

Anyway, more to follow.

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#142192 - 06/23/06 06:18 PM Re: High Pitched Hum... [Re: inthedeck]
inthedeck Offline
veteran

Registered: 03/22/06
Posts: 164
So, I unplugged everything from the receiver. Now, all that is plugged in, is the speakers. The hum is still there.

Could it be the surge protector causing this?

Volume levels don't seem to matter, as in, no matter how high or low the volume, I can hear the high pitched hum. Maybe I should try and unplug things from the surge protector? That might/might not help, but that might help? I will try, and report back.

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#142193 - 06/23/06 11:22 PM Re: High Pitched Hum... [Re: inthedeck]
bugbitten Offline
connoisseur

Registered: 04/06/05
Posts: 2339
Loc: Madisonville, KY
Did you try changing inputs even with nothing connected. Or maybe try changing from dolby to dts to see if it makes a difference. Try to see if in input is bad.

Also try connecting directly to the wall outlet.


Edited by bugbitten (06/23/06 11:25 PM)

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#142194 - 06/24/06 01:01 AM Re: High Pitched Hum... [Re: inthedeck]
pmbuko Offline
shareholder in the making

Registered: 04/02/03
Posts: 16437
Loc: Ben Lomond, California
Good idea with the surge protector. Try plugging the receiver directly into the wall. Also unplug other devices that may be on the same circuit.
_________________________
I can explain it to you but I can't understand it for you.

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