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sub cable

Discussion in 'Cables & Switches' started by Mr Cat, May 12, 2005.

  1. Mr Cat

    Mr Cat
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  2. eviljohn2

    eviljohn2
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    That would do a decent job, I don't think you'd go wrong with one of Mark Grant's offerings either. :)
     
  3. Mr Cat

    Mr Cat
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    whats the difference between a 75ohm cable one a non 75ohm cable..??

    cheers
     
  4. eviljohn2

    eviljohn2
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    75ohms is the characteristic impedence although this is only really relevant at higher frequencies such as those used in digital audio and video transmission. Impedence is a function of the cables complex capacitance and inductance (overall termed reactance) and it's real resistance. By matching impedences throughout a signal chain we insure the maximum possible power transfer from one component to the next.

    However, the standard RCA phono plug was never designed with a characteristic impedence of 75ohms so no matter which cable you use there will still be a "bottleneck" at either end. I think that one or 2 models get quite close (Canare, Eichmann...) but havn't tested them. For a true 75ohm cable you need to use 75ohm BNC connectors.

    It's also worth noting that 50ohm cable and BNC connectors are available (usually used in computer networks) and that XLR connectors have a characteristic impedence of 110ohms.

    Basically, don't worry about it too much. :)
     
  5. Mr Cat

    Mr Cat
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    cheers - thanks for a fast and comprehensive asnwer, as always...! ;)
     
  6. Ian J

    Ian J
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    I'll second the suggestion for Mark Grant's cable which is not only better quality than the commercially available stuff with an expensive advertising budget to pay for but it's also under your budget
     
  7. Mr Cat

    Mr Cat
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    I've already bought it now - however, I'm looking for a new interconnect to replace my broken QED qnex 2...wanna pay upto 35 quid...
     

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