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In Reply to: Resonances in interconnects posted by Klaus on November 09, 2004 at 02:42:39:
All you need is some broadband noise from an external source to excite the resonances in any of these cables.Linear power supplies with capacitor input filters and junction diode rectifiers are excellent sources of noise. Nearby TV satellite or cable converters, wireless routers for home computers, portable phones, the X-10 wireless control devices, etc., etc., all contribute.
Keep in mind that RFI does not respect the audio component designer's wishes for the input and output ports. It can come out the input ports and go in through the output ports.
Regarding mechanical resonances, do you think there is no sound from your audio system behind your rack? Do you think your rack itself is not a resonant structure, or the equipment panels to which your cables are attached?
Follow Ups:
Hey Al,Are you saying that RFI and line noise cause cable resonance as well?
I mean, of course they do at some level, but appreciable?
"Let me help..."
where can i download it?
http://www.kimbanet.com/~eandpnewnam/pnK/penguin.htm
"Let me help..."
RFI is very real. Noise from amps, broadband, flourescent ballasts, etc., is very real, and very much hearable.I'm not at all certain that this is part of the "resonance" discussion.
Regarding mechanical resonance...also very real, and most definitely hearable. As has been demonstrated, every room has a resonant frequency, and everything in that room affects the resonant frequency. Hence bass traps, carpets, draperies, and the distance of the speakers from the walls all have an affect.
Every cable has impedance. (And resistance, and capacitance, and inductance, and reactance, and, and, and...). The question is whether or not any of this is material. That is, can you hear it, or can you hear the difference when any of these parameters change within the normal ranges of normal cable materials at normal ambient temperatures and normal audio frequencies.
No. RFI and line noise can cause resonance in a cable. The resonance is at such a low level that it is not discernable by human ears. I'm not saying that the RFI and noise aren't discernable, they most certainly are. I'm saying that any resonance set up by these phenomena are below the threshold of human hearing.
I'm among the converted.I ameliorate RFI grunge through strategic placement of ERS material.
I combat vibration with Vibraplanes, damping material and roller bearings.
I banish line noise with regenerated balanced power.
I've even got a lovely set of antique cable risers, (see eBay/insulators), keeping my speaker cables from ever touching the floor. Of all the tweaking, this is the only one I'm still dubious about. I've seen claims the cable risers work by reducing vibration in the cable.
Seemed far-fetched, more likely changing dielectric properties I figure. I have a polished concrete floor, close to a ceramic/pyrex insulator anyway. But those insulators are the first thing non-audiophiles ask about.
"Let me help..."
Sorry to disagree with you. These things are definitely obstacles to hearing all the detail on our good old Redbook CDs.The naive user would have to be very lucky to assemble a system free of electrical and mechanical resonances. Cables are part of the package, and my efforts to tame electrical resonances in them have given me a lot of satisfaction.
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