From: ruffrecords@yahoo.com   
      
   Randy Yates wrote:   
   > Ian Bell  writes:   
   >   
   >> Audio Empire wrote:   
   >>> 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?   
   >> Not heard of hum loops then?   
   >>   
   >>>> 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.   
   >> So the recent AES lectures on this very point were, er pointless then?   
   >>   
   >>> I still wouldn't consider that an overwhelming reason to use   
   >>> transformers and still think that the disadvantages of transformers   
   >>> outweigh the advantages.   
   >>   
   >>   
   >> I never said transformers were better, the OP just asked why you would   
   >> NOT use a diff. amp and I gave two examples.   
   >   
   > Thanks for the information and examples, Ian. Actually what I should   
   > have asked is, "Is there ever a reason NOT to use a differential   
   > (balanced) configuration for mic inputs?" whether differential amplifier   
   > or transformer. But I get you.   
   >   
   > --Randy   
   >   
   >   
      
   No problem.   
      
   Cheers   
      
   Ian   
      
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