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In Reply to: RE: You will see the same voltage across both sets. posted by clifff on June 01, 2007 at 06:48:34
Yes, it would seem that you will see the same voltage at the ends of the two cables, but in reality, YOU WILL NOT. How much will this voltage differ?
By the amount that the impedance of the two different crossover sections differ vs. the finite impedance/resistance of the cables, and the amount of CURRENT flowing in each separate cable.
Due to the differing impedances of the two sections of a two-way crosover, the cable connected to the woofer section will see a lot of current at LF's, but very little at high frequencies, while the cable connected to the tweeter section will see some curent at HF's, but not very much at all for LF's.
This is due to the fact that the LF section will have a low impedance at LF's, but it will get higher and higher as the frequency goes up, while the HF section will have a low impedance at HF's, but it will get higher and higher as we go down in frequency.
I show this info, taken from a real speaker, at:
http://www.geocities.com/jonrisch/page9.htm
related pages are at:
http://www.geocities.com/jonrisch/biwiring.htm
http://www.geocities.com/jonrisch/biwiring2.htm
http://www.geocities.com/jonrisch/biwiring3.htm
So the people that argue that biwiring does nothing, because they are only thinking of voltages, are dead wrong, and really haven't given the matter much thought, or bothered to do some basic measurements.
The voltage differences will be on the order of fractions of a dB, with the yardstick being that a voltage difference that is 40 dB down from nominal will result in a 0.1 dB change in level. I have measured differences greater than that, and have provided evidence for sonic differences being relevant down to -90 dB below nominal, so there is a wide range of potential sonic differences that bi-wiring can be responsible for.
Jon Risch
Follow Ups:
Your reply is not really a reply, and certainly is not clear.
Pro-DBT pundits use deviations of 0.1 dB all the time to try and say that such a deviation could be responsible for a sonic difference.
I have measured voltage differences between the two sets of terminals as much as 0.5 dB, which is only 26 dB down from nominal. Almost all instances of bi-wiring vs. single wiring will cause a difference of 0.1 dB or more. Certainly these are within the realm of a possible sonic difference.
Of course, this is JUST the voltage differences between the two sets of bi-wiring terminals, it does not take into account the potential for inter-driver IM, etc. as outlined at the URL's I referenced in my earlier post.
Perhaps you would care to comment in detail?
Jon Risch
Scuttle back to the safety of your cable infernum.
I was trying out the new format, switched back to the Classic format, and got 'turned around'. However, it does seem that you figured out that I was trying to reply to you, so it wasn't a terminal mistake in that sense.
I suppose it is easier to not answer the question, and to blow it off with an ad homenium attack.
Oh well.
Jon Risch
Clifff, you might find that Jon has powerful friends, and we do not take well to you insulting him. Just a friendly suggestion. ;-)
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