Could be a bunch of things.  If you would be more specific about the noises
(distortion? clicking? ringing? buzzing? hissing?) and WHEN these noises
appear (all the time or when you are just cranking it up) we could probably
help you more.

But I'll take a shot in the dark: it could be "lead-slap" (I actually coined
this term while working at Phoenix Gold, but I don't think it has really
ever caught on).  This is when the speaker leads (before they get to the
voice coil) slap on the back of the cone when the woofer is really pumping.
It sounds like a sharp "popping" or "slapping" sound, often confused for
clipping.  Within an enclosure, it often goes unnoticed.  But up close, it
can sometimes be detected (especially in vented enclosures).  I once had a
pair of Soundstream SPL12's that BOTH did this.  I fixed the problem by
using some rubber cement around all the connections near the cone.  Again,
this is probably not your problem, but you never know.

MOSFET

cougerjet@hotmail.com wrote in news:1140670679.170792.145090
@v46g2000cwv.googlegroups.com:

What kind of sounds do you hear?

How is everyone giving this guy advice?  I couldn't even understand what he
was talking about!

Tony

I'm guessing that you have one of those flashy square kicker solo baric subs,
square speakers produce square sound waves making the music sound clipped,
unless you have a car that is rounded like the VW Bug. Sound waves should be
rounded and this is why most speaker manufactures make round speakers. Few
years ago Bazooka tried the same thing with a triangle sub, This was made to
produce low sub bass and very narrow upper bass, the trouble with that was
that too many people mounted the subs upside-down and ended up with  lots of
upper bass and very little sub bass. If I'm not mistaken Audio-Pipe sells
square to round speaker converters, Ask your local car audio store, most place
stock them.