[200q20v] static buzz through speakers while accelerating

[Vztante at aol.com]

The buzz is not speed dependent, rather throttle position-dependent.  The 
thing is, it doesn't buzz every time I step on the gas. It never happens at 
idle, or when the car coasts in gear.

Isn't the filter(interference reducer) attached to each speaker or it's amp, 
thus requiring replacement of the whole speaker/amp/filter?

TIA,

Mitch Frey
'91 Miata "Torqueless Tailwagger"(for sale)
'00 A6 2.7t
'91 200tq20v