Tweakers' Asylum

• 300pf per foot per 1999 Chris VH posting How to use data? - WilHenry 07:31:03 03/06/09 (3)
  In Reply to: RE: Characteristic's of Cat5 receipe cables for speaker filter? posted by WilHenry on March 06, 2009 at 07:18:47

  It pays to use the search. Now how to turn that info into values for filter?

  300pf times 10 feet equals 3000pf. What size resistor(s)?
  
  

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  Edits: 03/06/09

  • Start with what's been tried. R = 10 to 20 ohms. - Al Sekela 15:34:40 03/06/09 (2)
    In Reply to: RE: 300pf per foot per 1999 Chris VH posting How to use data? posted by WilHenry on March 06, 2009 at 07:31:03

    Keep the corner frequencies away from the audio band.
    
    There may be a benefit from matching the cable impedance if you can measure it or calculate it. The Walker recipe of ten ohms is clearly too low to match most speaker cables, so it is possible he was trying to load the amplifier. Even if the resistor is not a perfect match to the cable, the filter will be better than nothing at damping internal cable resonances.
    
    

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    • RE: Start with what's been tried. R = 10 to 20 ohms. - WilHenry 20:25:50 03/06/09 (0)
      In Reply to: RE: Start with what's been tried. R = 10 to 20 ohms. posted by Al Sekela on March 06, 2009 at 15:34:40

      Oh ok, I guess I'm going over the top a little. I was also a bit concerned about the capacitance of the cables but they don't seem to make the Denon amplifier run too hot plus I have the outlaws in the lines and they barely warm up even with HT. I ordered extra resistors (and caps) in case I want to put a filter at both ends of the cables. So I can try more ohms. Thanks, that's the advice I was looking for---what's been tried. I appreciate the responses.
      
      

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      Edits: 03/06/09
    • As Al says, when I did this with my DIY Cat 5 - bartc 19:53:40 03/06/09 (0)
      In Reply to: RE: Start with what's been tried. R = 10 to 20 ohms. posted by Al Sekela on March 06, 2009 at 15:34:40

      I used both 10 and 20 Ohm Rs and either worked fine.
      
      

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