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Re: Some clarification needed...

Posted by Mart (B) on September 22, 2001 at 06:52:40

In Reply to: Some clarification needed... posted by s.hum on September 22, 2001 at 06:05:27:

it was ...
4( 8ohm resistors )
4( 0.47mfd caps )
4( 10pfd caps )

This makes for 4 Zobels. 2 per channel. As such I recommended splitting the single Zobel usually used for a single cable per channel. So, instead of using a 4ohm resistor coupled to a 1mfd cap to conjugate ultrasonic instabilities above the Nyquist frequency, I opted to split it since the units are in parallel. You can also try a single 4ohm Zobel per channel at the amp but that's a side issue.

The bypass cap is either to bypass (be wired in parallel with) the Theta or the Zobel. ie:

  
 0----- 8ohm -----+----- 0.47mfd -----+-----0 
                  |                   |       
                  +----- 0.01mfd -----+       
  

  
 0-----+----- 8ohm ----- 0.47mfd -----+-----0 
       |                              |       
       +---------- 0.01 mfd ----------+       
  

(the idea of bypassing the entire Zobel is because non-inductive resistors at audio frequencies (where it is negligible) become inductive (no longer neglible) at radio frequencies. A disc cap is meant to operate there and would only short out frequencies above 2.3MHz.)

....just my 2¢

» moderate Mart £ «

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