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?
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?