Troy H. Cheek writes in a message to All
  
 THC> As I've mentioned here before, I feed scanner output through 
 THC> an off-brand 200 W car stereo amplifier I picked up on sale 
 THC> sometime back. As I may not have mentioned before, this amp 
 THC> has a 10 band graphic equalizer. While listening today to somebody 
 THC> who apparently had a loose ground in his mike, it occurred 
 THC> to me to start fiddling with the equalizer... 
  
What you were hearing is probably one of the higher PL tones that the scanner 
wasn't filtering out.  Anyway, a parametric equalizer would be better than a 
graphic equalizer.  A parametric type has several tunable filters that can 
either notch or boost the frequency that it is tuned to.  You can also make 
the bands wide or narrow.  For a PL tone, just make a narrow notch on the PL 
frequency, for a "mushy" microphone, tune a high band filter for some gain.
  
Rane makes a good low-end parametric (SP-15 or RA-15 models) that they sell 
for sound reinforcement and broadcast use.  It will set you back about $550 
(depending on where you buy it) so it is well within the range of many 
scanner users.
  
Of course you will then want to follow the equalizer with a good amp... maybe 
something by Bose or Sherwood.  And speakers...  I suggest Altec A-7!  Ya, 
that's the ticket!    With that setup you could run more watts into the 
speakers than most agencies run into antennas!  
 
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