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Speaker hum

Would going from a 90db sensitivity to a 98db sensitivity speaker uncover a hum? I've been doing all the plug / unplug / cheater plug moves and haven't found it yet. It started when I swapped in new speakers and it's making me crazy. I have a 2-20 amp duplex receptacles fed directly from the breaker panel, same buss bar and grounds tied together in the 4 x 4 box at receptacles. I have an Odyssey Stratos Plus stereo amp and a NAD - C 658 BluOS Streaming DAC/Preamplifier.
mastercraft1990
elizabeth
6,726 posts
 
A hum ... Is it loud? or soft? Is loud enough to clearly hear 20 feet away? or just a few feet away?  Both speakers? or just one?            
If loud them most likely a ground loop, if just soft but annoying.. Then yeah you had it all along and never knew it.  
Is the hum there preamp disconnected completely Like unplugged and no IC.. from amp. but amp turned on.If yes just from amp. Then you got the culprit.Also, how different is the impedance of the new speakers from the old ones?


millercarbon's avatar
millercarbon
324 posts
 
With respect to the hum you are hearing now, all the speakers would have done is make whatever was already there 8 dB more noticeable.
jetter
1,035 posts
 
Is your set up attached to a cable box, i.e., you play your tv through it occasionally?  This is a commo source of hum, which I have experienced.  Needed to simply purchase a Jensen VRD-1FF IsoMax Digital RF Isolator which handily took care of the problem.
schubert
4,867 posts
 
Very easily, that is a huge jump !
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