From: nobody@but.us.chickens   
      
   On 3/23/2010 5:40 PM Audio Empire spake thus:   
      
   > On Tue, 23 Mar 2010 16:44:59 -0700, Ian Bell wrote   
   > (in article ):   
   >   
   >> Audio Empire wrote:   
    >>   
   >>> On Tue, 23 Mar 2010 08:40:00 -0700, Randy Yates wrote   
   >>> (in article ):   
   >>>   
   >>>> Is there ever a reason NOT to use a differential amplifier as   
   >>>> the first stage of a microphone preamp?   
   >>>   
   >>> I really can't think of any instance where NOT using a   
   >>> differential amplifier as a microphone input stage would, in any   
   >>> way, be considered beneficial.   
   >>   
   >> 1. They provide no galvanic isolation (transformers do)   
   >   
   > And this is important, when?   
   >   
   >> 2. If they have phantom power connected to them, user cock ups an   
   >> destroy the input stage (transformers don't)   
   >   
   > Most modern differential amplifiers are pretty well protected against that. I   
   > still wouldn't consider that an overwhelming reason to use transformers and   
   > still think that the disadvantages of transformers outweigh the advantages.   
      
   Why are we even discussing microphone transformers here? (I guess this   
   is the Usenet version of "telephone".) I mean, the OP didn't mention   
   them; neither did they mention phantom power, yet everyone seemed to   
   jump to the conclusion that this would be a crucial consideration.   
      
   I'd say that since a differential amp practically eliminates common-mode   
   noise, there's no reason *not* to use one (which, after all, was the   
   question the OP asked).   
      
   Sheesh.   
      
      
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