XPost: alt.engineering.electrical, sci.electronics.design, sci.e   
   ectronics.repair   
   From: grizzledgeezer@comcast.net   
      
   This looks a lot like the kind of tone controls mass-market   
   consumer-electronics equipment has been using for the past 60 years.   
      
   I don't know /exactly/ what your plans are, but the 1kHz corner frequency is   
   about the worst possible if you're trying to correct errors in the speakers   
   you're designing.   
      
   Unless you want a "tone control" that produces shrill treble and boomy bass,   
   you need to move the treble corner up, and the bass down.   
      
   Furthermore, it would make sense to design the speakers first, and see what   
   sort of correction they need. There are plenty of inexpensive drivers with   
   relatively flat response (if you believe the spec sheets). Neither they nor   
   most recordings will need much in the way of correction, so the best tone   
   control would be one that supplies small amounts of boost and cut at the   
   frequency extremes.   
      
   Unless you're looking for lots of boom and sizzle.   
      
   There are plenty of op-amps with a wider voltage range -- the 5534 and   
   TL-074 come to mind, but these are rather old designs. I'm sure someone will   
   be able to recommend something newer.   
      
   --- SoupGate-Win32 v1.05   
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