In article , Meat Plow wrote:
On Tue, 18 Sep 2007 14:47:28 +0100, N Cook wrote:

Reported as fuzzy sound on the bass guitar E string even at relatively low
levels
but otherwise fine sound rendition or backing off the bass control .
Feeding a signal generator in then indeed a distinctly fluttery distortion
in the range 50 to 70 Hz on top of the wanted output, ok above or below that
range.
No external speaker output on this cube and before getting inside to scope
it or run an external speaker I took the front grille of in case of
parasitic rattling but no change. But putting a sock in the front/back vent
tube in the speaker surround cured it.
Where to go from here ? sci.acoustics.repair ? charge for an old sock ?

Try a different speaker.

Well it seems like it could be electronic or mechanical. Putting a sock around
a vent will usually make the cone move more and create more distortion, if
that is the problem. I can't believe there is a vent, and a 10 inch guitar
speaker can't reproduce 50 Hz unless its a HIFI driver. The description about
speaker surround, baffles me.

greg