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100.2.34.3
In Reply to: RE: Speaker cables -- different lengths for L/R ok? posted by BCR on November 24, 2015 at 10:26:30
Follow Ups:
And what makes you so sure?
OK, I did the math....Assuming 5mm diameter conductors spaced 8mm apart and a dielectric constant of 1:
Time Delay: 1.016nS /foot = 0.007315 deg / foot @ 20kHz
Resistance: 3.028 mOhms / foot
Inductance: 128nH / foot = 16.085 mOhms / foot @ 20kHz
Capacitance: 8pFd / foot = 1.005 uSiemens / foot @ 20kHz
Edits: 11/26/15 11/30/15
Good job. So let's assume a 4 ohm speaker with a 1st order low pass filter (a coil in series with the woofer which would typically have a DCR of 0.3 ohms), the impedance with a 10' cable would be 4.306ohms and with a 25' cable 4.318 ohms and the resulting loss from the extra 15' is 20xlog (4.306/4.318) or -0.02 db.
Some things in audio are hard to define and explain (why some cables sound different for example) and other things are just the result of simple classical physics.
Take a look!
THAT was a pretty useless post.
Although, I'm sure it helped to keep your ego inflated.
My ego has nothing to do with it. Simple math shows that the increased resistance is trivial.
More!
http://www.chord.co.uk/help-and-information/speaker-cable-guide/why-materials-matter/
Hogwash.
:)
So a 5 and a 3 metre pair, a 7 and a 4 metre pair and a 10 and a 6 metre pair were good."
You have me confused.
Which side of the discussion are your links supporting?
"Once this was all Black Plasma and Imagination" -Michael McClure
This part.The length of cable might be a problem with certain amps.
There is an obvious logic in keeping the lengths of speaker cable used in the hi-fi system the same. The vast majority of pairs of speaker cable that we supply are of equal lengths. Increasingly though, people are using odd lengths of speaker cable in a system. This is something that we researched quite carefully. What we found was that a difference in length of not more than 40% worked pretty well. So a 5 and a 3 metre pair, a 7 and a 4 metre pair and a 10 and a 6 metre pair were good. There are a couple of important points here though. Whilst the vast majority of amplifiers will be completely happy with a different length pair of speaker cables, some amplifiers use the speaker cable as part of the circuitry and in this case, cable lengths should be kept the same. Before using different lengths of speaker cable, it is important to check with the manufacturer of the amplifier.
Contact The Cable Doctor for further advice and recommendations for your particular system.
Find more advice and information about speaker cables in our speaker cable guide.
AA
"Once this was all Black Plasma and Imagination" -Michael McClure
I'll take "knowledge" for five hundred, Alex.
:)
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