Strange problem with this wiring/grounding scheme - diyAudio
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Old 17th April 2007, 02:27 AM   #1
Leolabs is offline Leolabs  Malaysia
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Unhappy Strange problem with this wiring/grounding scheme

When nothing is connected to the inputs,very very quiet;when something is connected to both channel input,at max volume,there will be some low frequency noise on both channel.

Is this a ground loop problem between channels and how to tackle it???
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Old 17th April 2007, 02:38 AM   #2
BWRX is offline BWRX  United States
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Try disconnecting the shield from ground at the amplifier end.

Depending on how you have this wired and connected, multiple sources may not like sharing ground connections if they are all connected to earth ground at the outlet.
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Old 17th April 2007, 09:59 AM   #3
AMV8 is offline AMV8  United Kingdom
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I place a thermister between audio ground and earth/chassis within each pre amp and power amp. This avoids a direct connection between audio ground and earth but at the same time allows a direct connection in the event of a fault within any item. I use 10 ohm 15 amp thermister for power amps and 10 ohm 5 amp thermister with pre amps.

I connect between equipment as you seem to with the shield of interconnects connected at the pre amp only.

I think if you follow the above you should avoid problems with earth loops.

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