In Reply to: RE: " Running 25 ft cables could be part of the problem with your preamp" ... posted by gregc4 on January 24, 2012 at 12:59:55:
DC offset is easy to measure and can cause huge problems. Most a/v enthusiasts are unaware of it. Just disconnect the speakers, and measure DC volts @ speaker connection on the amp while turned on, nothing playing. Anything other than 0 is DC offset. up to 100mV is okay, but under 25 or so is best. Issue can be in amp or anything upstream. i.e. if the source or pre-amp is sending anything other than 0mV when it's supposed to be silent, the amp will amplify that as well.
My amps range from 0-15mv, to about 120mV on an old Yamaha integrated.
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Follow Ups
- RE: " Running 25 ft cables could be part of the problem with your preamp" ... - acroy 01/25/1206:40:45 01/25/12 (7)
- RE: " Running 25 ft cables could be part of the problem with your preamp" ... - Roger Gustavsson 11:07:52 01/25/12 (0)
- RE: " Running 25 ft cables could be part of the problem with your preamp" ... - gregc4 09:59:28 01/25/12 (5)
- RE: " Running 25 ft cables could be part of the problem with your preamp" ... - Satie 11:19:38 01/25/12 (4)
- RE: " Running 25 ft cables could be part of the problem with your preamp" ... - gregc4 11:46:40 01/25/12 (3)
- RE: " Running 25 ft cables could be part of the problem with your preamp" ... - Satie 14:47:07 01/25/12 (1)
- RE: " Running 25 ft cables could be part of the problem with your preamp" ... - tyu 03:01:07 01/27/12 (0)
- "it appears I do not have an offset problem" ... - andyr 14:31:57 01/25/12 (0)