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   rec.audio.tech      Theoretical, factual, and DIY topics in      41,683 messages   

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   Message 39,943 of 41,683   
   David Nebenzahl to All   
   Re: Impedence matching problem   
   22 Aug 10 18:04:56   
   
   From: nobody@but.us.chickens   
      
   On 8/22/2010 4:34 PM Bill Graham spake thus:   
      
   > I am new to this group, so I apologize for asking a question than may have   
   > been asked and answered many times before. I am a trumpet player, and I   
   > would like to mike my horn and add a chorus effect to the output of the   
   > mike, which I will then send to my 45 watt Beherenger keyboard amp and   
   > speaker unit. I am using an Audio Technica PRO 35 R condenser mike which has   
   > a low impedance output, since it requires a phantom power unit, and when I   
   > put this signal into any of several chorus units, the result is very   
   > distorted, since all these units are made for electric guitars, and they all   
   > have high impedance inputs, as far as I know. What I would like to know is,   
   > does anyone know of a chorus unit that can accept a low impedance input so   
   > it can be driven by a condenser mike without distorting? Or, if not, how can   
   > I change the mike output to a high impedance so it won't seriously overdrive   
   > the chorus effect unit?   
      
   Not an answer, but speculation (informed, I hope): since a   
   high-impedance input won't overload a low-impedance device (as it will   
   if vice versa), couldn't he just insert a pad (L pad? T pad?) between   
   mike and input? Seems like this is more of an attenuation problem than   
   an impedance-mismatch problem. (In other words, the mike is overdriving   
   the input: too much voltage.)   
      
      
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