Originally Posted by
grumpy
Seriously. Find a large flat-bladed screwdriver. Turn the "level adjustment" L-pads up
and then down, several times... listening for scratchy sounds from the speaker (while
playing music) or for jumps in level... either indicates an eventual need for replacement
of the L-pad behind the front panel.
Sometimes you can get away with just finding a place where the L-pad is happy (not
oxidized, burned, or otherwise damaged in a particular area of its rotation. They wear out.
Same with the Bi-amp switch in the back, near the speaker wire terminals. Turn it back
and forth several times... it might scrape off some crud or oxidation that has built up
over time (just put it back when you're done).
Have you figured out which driver (or all of them?) is sounding less loud?