Concerning _Annoying tones_, Scott Christensen said to Troy H. Cheek in 
SCANRADIO:
 SC> What you were hearing is probably one of the higher PL tones that the
 SC> scanner wasn't filtering out.  Anyway, a parametric equalizer would
 SC> be better than a graphic equalizer.
Oh, no doubt.  But while I have a graphic equalizer already bought and paid 
for and installed in my car...
 SC> Rane makes a good low-end parametric (SP-15 or RA-15 models) that
 SC> they sell for sound reinforcement and broadcast use.  It will set you
 SC> back about $550 (depending on where you buy it) so it is well within
 SC> the range of many scanner users.
My equalizer cost me something like $50 on sale...
 SC> Of course you will then want to follow the equalizer with a good
 SC> amp... maybe something by Bose or Sherwood.
And had an amp built in...
 SC> With that setup you could run more watts into the speakers than most
 SC> agencies run into antennas!  
And my little 40 watt speakers would no doubt thank me for it.  :-)
Seriously, it's good to know that such options exist, but sometimes it's just 
better for me to go with what I've already got onhand.
... Amateur Radio Operators do it with much greater frequency!
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