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Author Topic: headphone jack feeds back?  (Read 2276 times)

sweetspence

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headphone jack feeds back?
« on: January 29, 2012, 02:23:25 PM »
i reciently bought a behringer vampire 112 modeling am and every thing worked great untill i tried to plug in headphones... so guitar it plugged in and volume is off i plug in my sennheiser headphone and the thing starts feeding back, everything goes back to normal when i unplug headphones. could it be leads are touching? or some sort of ground loop?

J M Fahey

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Re: headphone jack feeds back?
« Reply #1 on: January 30, 2012, 02:10:23 AM »
Strange.
*How* are you plugging your headphones?
Do they have an 1/4" stereo plug"
Do you use an adapter for 1/8" miniplugs?
Does any control have influence on the feedback?

sweetspence

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Re: headphone jack feeds back?
« Reply #2 on: February 01, 2012, 11:27:15 PM »
headphones are using a 1/8" to 1/4" stereo adapter and it feeds back into the main speaker and not the headphones. no controls have any affect on the feedback.

J M Fahey

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Re: headphone jack feeds back?
« Reply #3 on: February 02, 2012, 05:10:13 AM »
I think you are plugging your headphones in the Power Amp In or Loop Return .
The "real" headphones jack mutes the speaker, hence, no sound.

sweetspence

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Re: headphone jack feeds back?
« Reply #4 on: February 02, 2012, 11:27:11 PM »
heres the amp "phones" jack above guitar input..
http://www.behringer.com/EN/Products/LX112.aspx

bry melvin

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Re: headphone jack feeds back?
« Reply #5 on: February 04, 2012, 12:13:36 PM »
I have run into similar problems with using adapters

Check the length of the adapter with other stereo 1/4 inch jacks

I have run into adapters that are just a little short keeping the tip from activating the switch that cuts the speaker off

J M Fahey

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Re: headphone jack feeds back?
« Reply #6 on: February 04, 2012, 02:24:38 PM »
Now I believe you.
Amazing.
Only a MORON would fit the headphone jack (which handles the strongest signal possible in an amp: speaker level), of all places, just by the input jack, maybe even sharing grounds or al least being as close as possible.
Doubly so in a high gain amp. :trouble :grr

sweetspence

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Re: headphone jack feeds back?
« Reply #7 on: February 05, 2012, 09:40:59 PM »
yeah its odd to say the least.. i will do some tinkering to see if i can isolate the issue. on a good note this thing actually has some legit tones some of the emulations are so close its unreal. :duh

joecool85

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Re: headphone jack feeds back?
« Reply #8 on: February 06, 2012, 11:53:21 AM »
I'd take Bry's advice and check that the length of the adapter is right.
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