Originally Posted by derrickdj1
Biwiring works by reducing of the tendency for strong bass signals to overwhelm the rest of the audio signal. The larger, more powerful bass signal can greatly affect the integrity of the much lower-energy components of both the midrange and fragile treble information.
One signal can't overwhelm another signal in a linear system. In a linear system, the laws of superposition and scaling must be true. If they are true, then signals that pass through the system can't overwhelm or even affect each other.
OTOH, if a system is nonlinear, then signals that pass through it can indeed overwhelm each other as you suggest.
Biwiring does not affect either the amplifier or the speaker. The amplifier sends out the same signal regardless, and the speaker receives the same signal regarless. If biwiring affects anything relevant, then it must affect the speaker cable itself, because the speaker cable is the only thing that sees a different situation in biwiring.
In biwiring the current through the speaker cables is again the only thing that changes when biwiring is set up. The speaker cables see the same voltages since one end of each cable is attached to the same amplifier channel. However, due to the difference between the tweeter as a load and the woofer as a load, each of the biwired cables does pass different currents once biwiring is set up.
So, the question is whether or not speaker cable is linear or nonlinear.
Running separate wires from the amplifier can have a profound impact on relieving the tweeter circuit from the back flush of EMF (elector-motive force) generated by the woofer.
Incorrect. In biwiring the woofer and the tweeter are still hooked in parallel, its just that the wire connecting them is quite a bit longer. If the speaker wire has a lot of resistance or a high impedance, what you describe could happen. However, even mediocre speaker wire has too low of resistance for what you describe to take place.
When the audio signal to the woofer ceases, such as when a loud bass note is finished, the woofer tries to stop moving. In trying to stop, it actually goes through a process of "settling" because it is too massive to just stop instantly. As it settles, it moves forward and backward repeatedly until it can completely come to rest. During this movement, as the voice coil is moving through the field of the magnet, it generates its own signal. That generated is sent backward up the woofer wires and into the crossover, where it corrupts the rest of the music signal.
You have returned the discussion to the issue as to whether speaker cable is linear or nonlinear. If speaker cable is nonlinear, then the corruption or as you previously described it: "overwhelming" could take place. If speaker cable is essentially linear, then as previously show neither corruption nor overwhelming can possibly take place.
This just based on theory, I have always understood that for the most part, bi-wiring and passive bi-amping don't make a large difference in SQ.
The relevance of a theory should be possible to establish in a laboratory. There should be some measurement or set of measurements that would shed light on the theory of biwiring. If the theory of biwiring predicts certain measurable occurrences, then we should be able to make measurements in a laboratory and determine whether or not they follow the predictions of any theory of biwiring.
The theory of biwiring predicts a number of things that we can test for in a laboratory context.
For example, biwiring predicts a change in the measured performance of a loudspeaker. It predicts less what you called corruption or overwhelming or as I pointed out would nonlinear distortion.
Let's cut to the chase. If biwiring has any benefits it would be due to the fact that speaker cable is somewhat nonlinear. If biwiring has any benefits, biwiring a speaker should reduce nonlinear distortion, particularly when the test signal is composed of a tone that is reproduced by the woofer and another tone that is reproduced by the tweeter.
I can tell you for sure from lab tests that I have done that biwiring does not make a significant improvement in the nonlinear distortion produced by a speaker. I can tell you for sure that speaker wire is highly linear.
Therefore, the claimed benefits of biwiring are not confirmed by laboratory tests. I invite anybody who has the necessary test equipment to duplicate and confirm or dispute my test results.