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In Reply to: RE: I mean voltage, more precisely EMF posted by Dave_K on July 16, 2015 at 16:48:39
Oh, I am referring to an ideal model where there is only current driven by a voltage source and not induced.
In any case, a case is made for separating high and low pass filters from each other. Some 'philes have heard differences simply by splitting the board in half and moving the respective filters apart. By virtue of this, the cable in a bi-wire config would also move apart. All this said, the theoretical field around two conductors (send/return) in parallel and close proximity is zero. There may be interaction within a single cable jacket with two pairs cables, but if the cables are inches apart, I don't think it matter nearly as much if at all.
Cheers,
Presto
Follow Ups:
Oh, I am referring to an ideal model where there is only current driven by a voltage source and not induced.
The whole point of this sub-thread was RV's hypothesis regarding the magnetic field interaction between the two cables causing low frequencies to modulate high frequencies.
Oh, okay. To me it sounded like at certain points that things became fuzzy about current versus voltage at various points in the circuit.One thing that came out of this thread that is of interest to me though, ponder this:
Why would having low and high-pass filter currents in the same cable be less deleterious than having two separate, but in proximity, cables for low and high-pass filter currents? Aka, could not the low frequency content also modulate the high frequency content if in the same cable? In that case, the field associated with the lower frequencies is located immediately to the high frequency field.
In the case for separate cables, they can be moved further apart - reducing or even eliminating any possible effects.
Cheers,
Presto
Edits: 07/20/15
Why would having low and high-pass filter currents in the same cable be less deleterious than having two separate, but in proximity, cables for low and high-pass filter currents? Aka, could not the low frequency content also modulate the high frequency content if in the same cable? In that case, the field associated with the lower frequencies is located immediately to the high frequency field.I don't believe the low frequency content in the cable can modulate the high frequency content in the cable. Modulation is a non-linear process. What non-linear property of the cable is there that could produce this modulation?
EDIT: Let me expand on this a bit. Suppose we could replace regular wire with some kind of non-linear semi-conducting material that did cause one frequency band to be modulated by another. Given that a full range voltage is applied to the cable by the amp, and thus a full range electric field is present in the cable, the modulation would occur regardless of whether or not there is induced EMF from the magnetic field of a nearby cable.
Regarding the basic question of how can single wiring be less deleterious, I would expect it's system dependent. The single and bi-wire circuits are different and not equivalent to each other, so it's plausible that with some systems and cables bi-wiring might make things sound worse.
Edits: 07/22/15
The more I think about it the only thing I can up with is that the low frequency content in a full range signal is *supposed* to be there along with the high frequency content where with bi-wire any low frequency current induced in the high frequency cable is *not* supposed to be there.In a moving speaker cone, multiple frequencies being reproduced at once is another matter...
I wonder if cable self inductance can be a possible source of modulation within the cable for a full range signal? (In this case I thought we were dealing with relatively tiny inductance values that had very little effect...)
Cheers,
Presto
Edits: 07/22/15
Self-inductance is still linear
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