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Old 22nd August 2012, 03:18 AM   #4961
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Quote:
Supra doesn't seem to specify anything about the twisting (typically twists/meter is specified).
Yeah, it's a shame. The Rondo is twisted, the Ply model is screened, but from the cross section it doesn't look like it's twisted, but to me the the Linc is twisted and screened:

Supra Cables

But whatever "short pitch twisting" means is anyone's guess.

I couldn't care less about brand, and have no affiliation with Supra or anything, it's just one of the usual suspects that I found to offer twisted and/or screened speakers cables.

Last edited by tktran303; 22nd August 2012 at 03:21 AM.
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Old 22nd August 2012, 06:14 AM   #4962
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Pitch in this context refers to the angle of the twist, as in the pitch of a propeller (expressed in inches - 12 inch pitch meaning the propeller is pulled forward 12" with one revolution). There is supposed to be a pitch appropriate to 50 Hz which is not as short as the pitch to cancel 60Hz, although I don't know the specifics.
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Old 22nd August 2012, 06:22 AM   #4963
Julf is offline Julf  Europe
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Originally Posted by Russell Dawkins View Post
Pitch in this context refers to the angle of the twist, as in the pitch of a propeller (expressed in inches - 12 inch pitch meaning the propeller is pulled forward 12" with one revolution). There is supposed to be a pitch appropriate to 50 Hz which is not as short as the pitch to cancel 60Hz, although I don't know the specifics.
As a general rule, the tighter (shorter) the pitch, the better the noise immunity, but that is a very rough rule. In multi-pair cables, you want each pair to have a different pitch from the others.

Going back to the original question, the only data I seem to have is from ethernet cabling (UTP), and there we are talking about GHz frequencies, so not really relevant to speaker cables - but even there the benefit of shielding is only apparent when several cables have to share the same conduit.
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Old 22nd August 2012, 06:53 AM   #4964
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Originally Posted by ChrisPa View Post
Bruno has made no mention or recommendation of screened speaker cables, so I wouldn't bother

Surely wouldn't matter for the Hypex, but what about the rest of the system? Having a powerful long wave transmitter antenna close to a phono pre may not be the wisest decision.
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Old 22nd August 2012, 07:41 AM   #4965
Julf is offline Julf  Europe
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Originally Posted by analog_sa View Post
Surely wouldn't matter for the Hypex, but what about the rest of the system? Having a powerful long wave transmitter antenna close to a phono pre may not be the wisest decision.
I think that the twisting is better protection than shielding even against any possible radiated energy from the speaker leads. Twisting deals with electromagnetic fields, while shielding is for electrostatic fields.
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Old 22nd August 2012, 07:54 AM   #4966
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Quite possibly so. My knowledge of hf and antenna effects is not great at all. Has anyone measured the free-running oscillator leak-through to the output? It seems a couple of volts are normal for class D amps. Is Hypex any different?
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Old 24th August 2012, 12:01 PM   #4967
jtwrace is offline jtwrace  United States
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What & where is the link? This is on the home page from hypex.nl
Attached Images
File Type: jpg filter.JPG (37.7 KB, 480 views)
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Old 24th August 2012, 12:05 PM   #4968
jmbulg is offline jmbulg  Belgium
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http://www.hypex.nl/index.php?option...id=41&catid=46
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Old 24th August 2012, 12:14 PM   #4969
jtwrace is offline jtwrace  United States
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Originally Posted by jmbulg View Post
So it's DSP filters?
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Old 24th August 2012, 12:56 PM   #4970
jmbulg is offline jmbulg  Belgium
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So it's DSP filters?
That's what I understood, in the zip file are some executables among which "Hypex Filter Design v2.7.exe" modified on August 8th 2012.
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