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Topic: TV adds hum in new mixer? |
David Mason
From:
Cambridge, MD, USA
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Posted 16 Nov 2006 3:00 am |
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| For many years I have hooked up a line out from the headphones output of my TV to a little mini-mixer, and a guitar with a few stompboxes to another channel of the mixer, so I could run scales while watching and add musical "commentary" to football games and such. I am now trying to run a line from the TV to the RCA jacks of a significantly meatier preamp arrangement, and I am getting a hum from the TV connection, even when the TV's off. Is this something fixable, by changing the way the TV's plugged in or adding a ground-doodad or something? I don't usually have any noise problems with the power coming in the lines; there are no obvious flourescent hum generators, dimmer switches or such. |
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Jack Stoner
From:
Kansas City, MO
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Posted 16 Nov 2006 3:03 am
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Are you using a shielded "audio" cable from the TV to the mixer? Not a "speaker" or "headset" cable which is not shielded. Then again have you tried a different cable? Maybe the one you have is bad.
Last, the "ground loop" problem. Try a ground "lifter" adapter on the mixer and see if that fixes it. |
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Robert Leaman
From:
Murphy, North Carolina, USA
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Posted 16 Nov 2006 6:38 am
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| Majority of TV line connections do not use a 3-wire wall plug. Try reversing the wall plug if the blades permit it. |
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David L. Donald
From:
Koh Samui Island, Thailand
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Posted 16 Nov 2006 6:59 am
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If it happens with it off it is a ground loop.
Try inverting the leads in the cable.
Lifting the ground on one of the units / flipping the plug etc.
Seems the new unit has a either stronger
or weaker grounding scheme.
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Larry Clark
From:
Herndon, VA.
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Posted 16 Nov 2006 2:57 pm
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| Also consider when you said you were now using "meatier preamps" they are now boosting a hum that you couldn't hear with the mini mixer. A headphone out jack is an amplified output as opposed to a more preferable, quieter line level signal. |
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