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In Reply to: RE: Thanks, Mike ... posted by emailtim on June 18, 2021 at 20:30:08
But:
1. I use Belden 1595A - which is 'plenum rated' (so the individual solid strands are insulated with teflon not PVC. I strip off the blue PVC jacket.).
2. I don't do the ott braiding which early users popularised. I don't think it's necessary - you simply use as many twisted pairs as you think are required for the current drawn by the driver(s), for the length of the cable, and then you have 3 options for using the strands:
a. use the coloured strand in each twisted pair (tp) for '+ve' and the striped strand for '-ve'. This option gives you the lowest inductance - which is a good thing, in a spkr cable. But it does give the highest capacitance - which can upset some amplifiers if the spkr cable is long).
b. separate all the tps and use all the solid-colour wires for the '+ve' leg ... and all the striped wires for the '-ve' leg. Twist all the strands in '+ve' leg together ... and all the '-ve' strands together - so you end up with two separate cables.
This option gives you the lowest capacitance - which is a good thing for very long spkr cables (like 30' plus!) - but it does produce the highest inductance.
c. use equal numbers of tps for '+ve' and '-ve'. Twist all the pairs together (remembering which pairs you have allocated to '+ve' and which to '-ve'!).
This option is in the middle of the above two, in terms of 'L' and 'C'.
Andy
Follow Ups:
Thank you for the details.
20 years, about time you give them a HiRez update with some Cat 7e !!! =)
AIUI, Tim - Cat 7e is only different to Cat 5e in its twisting ... and possibly is shielded?
So I doubt it would make a sonic difference, as spkr cables. More important, IMO, is to make sure the tps are:
1. solid core, and
2. teflon-insulated.
Andy
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