I'd use a multimeter and disconnect your speaker, just in case. :)
Disconnect all your inputs and see if the problem goes away.
Speaker Oscillation issue ?
Hello All...
This is a problem that has been persisting for quite some time... I noticed my woofer on my right Harbeth 40.3XD was acting a bit strange . I turn off the music & the woofer is actually still moving in / out with no music? I tried moving the outputs to see if the problem follows to the other side and also swapping all tubes , no change....must be the amp acting up huh? Any advice appreciated...
Here's my gear :
Manley Monoblock Snappers
Manley Jumbo Shrimp Preamp
Harbeth 40.3XD Speakers