BC Dave
05-06-2004, 09:33 AM
Hi,
Several weeks ago I posted a thread about an extremely loud hum that would intermittantly eminate from my powered subwoofer, sometimes in the dead of night, waking up the family. I swapped out the sub for another one and changed the LFE cable and the problem remained. Anyway, I had an electrician friend over to see if he could help. First we hooked everything up to an Adcom line conditioner and powered up the system. The hum persisted. Next we used a 50-foot extension cord to plug the sub into another circuit, to rule out an electrical problem in the room. The hum persisted. Finally, he moved the sub several feet out from the corner, where it had resided behind my 32-inch JVC TV and... the loud 60-cycle hum disappeared. The sub is now sitting in the opposite corner of the room behind a couch and behaving itself. Can anyone explain this fix? Could it have been some kind of interference between the sub and TV being so close to one another? Although my main speakers are set to operate in "large" mode, no hum ever eminated from them -- just from the subwoofer. Thanks in advance.
Several weeks ago I posted a thread about an extremely loud hum that would intermittantly eminate from my powered subwoofer, sometimes in the dead of night, waking up the family. I swapped out the sub for another one and changed the LFE cable and the problem remained. Anyway, I had an electrician friend over to see if he could help. First we hooked everything up to an Adcom line conditioner and powered up the system. The hum persisted. Next we used a 50-foot extension cord to plug the sub into another circuit, to rule out an electrical problem in the room. The hum persisted. Finally, he moved the sub several feet out from the corner, where it had resided behind my 32-inch JVC TV and... the loud 60-cycle hum disappeared. The sub is now sitting in the opposite corner of the room behind a couch and behaving itself. Can anyone explain this fix? Could it have been some kind of interference between the sub and TV being so close to one another? Although my main speakers are set to operate in "large" mode, no hum ever eminated from them -- just from the subwoofer. Thanks in advance.