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Old 1st May 2011, 03:04 AM   #1
tessier is offline tessier  Canada
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Default Any opinions on this article about cable resonances ?

Hi

Any opinions on this article about cable resonances ?

Are cable resonances real and can they be audible? : Empirical Audio

Thanx

Paul
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Old 1st May 2011, 03:20 AM   #2
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Originally Posted by tessier View Post
Hi

Any opinions on this article about cable resonances ?

Are cable resonances real and can they be audible? : Empirical Audio

Thanx

Paul
I won't say it can't be heard but those resonances are up around 10 MHz. The amplifier output they show is NOT an audio amp. It's a better than average std def video amp. To reduce the effects an inline 'terminator', actually more along the idea of a grid stopper would damp out all the resonance as it would form a single pole low-pass filter with the cable capacitance as one of the components.

You NEVER drive a cable directly from the output of an opamp as the capacitance changes the stability. Check any operational amplifier data sheet for capacitive loading issues.

Even when I was younger 10 MHz was a stretch.

G
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Old 1st May 2011, 03:24 AM   #3
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Old 1st May 2011, 04:12 AM   #4
infinia is offline infinia  United States
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before you can sell a so called solution you must invent the problem 1st.

1) real audio amplifiers have a limited bandwidth and not able to support the rise / fall times to excite so called zip cord resonances.
2) most amplifiers feature damped series inductors to decouple their outputs from seeing the bad zip cord resonances which are shown well beyond the bandwidth of any audio signal, that they say is a the problem.
these are not a real world examples or problems
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Old 1st May 2011, 04:35 AM   #5
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Originally Posted by infinia View Post
before you can sell a so called solution you must invent the problem 1st.
I agree with infinia. Interesting that at first glance, everything he covers seems to be true and correct, just completely meaningless.

For all the science he uses in the body of the article, he links it to real world audio with only one or two sentences of very vague reasoning or basis...

in the end, it's just more FUD.

If anyone really needed such cables, they should first look at why the amplifier is so poorly designed...
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Old 1st May 2011, 08:51 AM   #6
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Ah, yet another peddler of expensive wire deliberatly misapplying basic engineering / physics in an attempt to blind the gullible. I don't think many of us need to stay awake nights worrying that our speaker wire is resonating a couple of decades or more above the HF limit of human hearing.

A rather better page on the subject: Debunking the Myth of Speaker Cable Resonance — Reviews and News from Audioholics

Last edited by Scottmoose; 1st May 2011 at 08:59 AM.
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Old 1st May 2011, 04:52 PM   #7
DF96 is offline DF96  England
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Are cable resonances real? Yes, just like any misterminated transmission line.

Can they be audible? No, unless your loudspeakers and ears extend up to MHz frequencies.

One small note: if a cable resonance happens to coincide with an interfering RF source then the effect of RF interference may be made worse. In this sense, and this sense alone, they may become audible. The solution is to improve the RF rejection of the equipment by adding filters on each port. Simple LC or RC low pass filter, adds a few pence to the cost.
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