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Post by 405x5 on Dec 11, 2016 20:57:27 GMT -5
"The world is flat, bees can't fly?, and the sky isn't blue...... really?" I've read all your posts in this thread to date. So far, this is all you've said that makes any sense to me. Bill |
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Post by yves on Dec 13, 2016 6:41:36 GMT -5
 Whoever designed this Bi-Wiring cable has missed the whole point of Bi-Wiring. The idea is to keep the two current paths isolated. That requires two separate cables, several inches apart. The wire depicted will induce capacitive as well as inductive coupling. The coupling can have a desired effect in that it cancels, or partially cancels out the part of woofer back-EMF that can neither be damped by the amp nor rejected by the high frequency crossover because neither the amp nor the crossover are perfect of course. To understand how it works, try to imagine that only the current flow resulting from the woofer back-EMF were at play (no coupling), now look at the direction of this current flow for each of the four wires separately, see how that direction affects the polarity orientation of each resulting magnetic field, and, finally, look at the coupling, or socalled "proximity effect" for each of the four wires and these four magnetic fields. Here's a good example.  |
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Post by mgbpuff on Dec 13, 2016 8:28:53 GMT -5
I think that the back EMF is sinked at the low impedance amplifier in bi-wiring., thus the high frequency drivers are less affected.
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Post by yves on Dec 13, 2016 10:27:17 GMT -5
I think that the back EMF is sinked at the low impedance amplifier in bi-wiring., thus the high frequency drivers are less affected. In the schematic I drew, think of this sink that you mention as being connected to the two midpoints of a pair of non-inductive bifilar windings wound around the same core. At the top right corner of the wikipedia article page linked below is a schematic of only a single non-inductive bifilar winding (the midpoint of this winding is on the right): en.wikipedia.org/wiki/Bifilar_coilSo the part of woofer back-EMF that manages to NOT get sucked out into the sink so to speak is going past the two midpoints I am referring to, but part of the key towards understanding what I have been trying to explain here is that there's not only capacitive and inductive coupling going on between both halves of a bifilar winding, but also between each of its halves and both halves of the OTHER bifilar winding. |
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Post by mgbpuff on Dec 13, 2016 10:54:04 GMT -5
O.K., I see your point. Not only do you have the amp sink effect of reducing coupling between the woofer and tweeter coils with bi-wiring, but you also get a differential current flow cancellation (much like XLR circuits) to further reduce coupling between high and low frequency circuits. Now how audible all this is is subject to trial. I have tried bi-wiring with my Revel Salon II speakers, but decided I liked doubling up the two speaker cables to effectively just gain a wire gauge increase. It sounded leaner bi-wired.
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Post by RichGuy on Jan 2, 2017 13:16:37 GMT -5
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Post by audiosyndrome on Jan 2, 2017 21:03:51 GMT -5
Like I said earlier, I = E/Z. Russ |
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