Posted by Lew on March 07, 2005 at 07:33:40:
In Reply to: Channel imbalance with biasing posted by Paul on March 05, 2005 at 09:27:53:
Are you saying that you can get the speaker to "crackle", but when you back off a bit the speaker
has markedly reduced efficiency compared to the other? If so, you may have a faulty
potentiometer. Try switching backplates between the two speakers. If the phenomenon goes
with the backplate then you do have a bias supply/potentiometer problem. Good news is that
you probably only have to send your backplate back to the factory, or if you are competent for
DIY,
they may be willing to send you a replacement part for you to install. I think that if you had a
bias voltage "leak" due to dust particles, as Lester suggested, you would not be able to get your
speaker to crackle at all, but I would never say never. (If the phenomenon stays with the speaker
panel when you switch backplates, then you do need to consider that you might have a bias
voltage leak between stator and diaphragm.)