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Old 21st November 2005, 03:22 PM   #1
ClassA is offline ClassA  Taiwan
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Default noise from bass unit of speaker

A low frequence noise (like onggggggg----) comes from the bass unit of speaker when my power amp (QUAD 405.2) is on. You can hardly hear it when your are 15~20cm away from the center of the unit and one channel is louder then the other channel. I just replace new caps for my 405.2. Is it the possible case that some cap are damaged by soldering issue or the power transistor is old?
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Old 21st November 2005, 03:50 PM   #2
johnnyx is offline johnnyx  United Kingdom
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Are you sure that the new caps are the right way round, and that you didn't damage any tracks when you changed them? I would check your work . Were the amps OK before you changed the caps?
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Old 22nd November 2005, 02:40 PM   #3
ClassA is offline ClassA  Taiwan
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I think it may be caused by the mismatch between these two (L/R)OP amps.
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Old 22nd November 2005, 03:03 PM   #4
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That doesn't sound at all likely?, did the amplifier work OK before you changed the capacitors?. If so it's obviously something you did when you changed them, as already suggested.
Nigel Goodwin
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