From: sonicprince@gmail.com   
      
   > If so, are they set as limiters to prevent speaker   
   > damage or are they active over a wide input range   
   > to increase bass loudness?   
      
   I don't think the cheap ones care about speaker damage.   
   Some might have varisters, others clamp the input.   
   I've only seen a moderate priced unit that compress's the input to make it all   
   muddy.   
      
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