High end speakers without bi-wiring?


Recently, I've read quite a few posts that disclaim the benefit of bi-wiring. The claim is that for bi-wire capable speakers, there is no noticeable difference between bi-wired and single-wired connection, assuming good quality jumper cabbles are used for single-wired configuration.
Then, is there a move from high end speaker manufacturers to forget about the bi-wiring option and just provide single wire for their high-end speakers?
(Well, bi-amping is another issue, but let's not consider bi-amping.)
ihcho

Showing 3 responses by almarg

My Daedalus Ulysses speakers, and I assume other Daedalus Audio models, have only one pair of terminals.

Also, these comments from Coincident Technologies' Israel Blume may be of interest. I take no position on those comments myself, but they certainly seem worthy of consideration based on their source.
08-22-11: Bifwynne
Ok, well if bi-wiring is now out of vogue, what can you do if you have bi-wired dedicated speaker cables?? My cables are Kimber and they were not cheap. I guess one could simply let two of the four connects just hang loose, assuming they are taped up to prevent shorting the amp, but for some reason, that just doesn't seem like a good idea.
A logical thing to try would be connecting them in parallel (i.e., both + wires to the + speaker terminal, and both - wires to the - speaker terminal). That will have the effect of substantially reducing overall resistance and inductance. That effect, of course, may or may not be audibly significant or subjectively preferable.

Regards,
-- Al
08-23-11: Johnk
You have the same signal on both runs of biwire. The treble and bass do not just travel on the cable run you pick for them unless actively filtered.
In a bi-wire arrangement the current and the power corresponding to the high frequency and low frequency spectral components of the signal do indeed travel on the cable run that is picked for them, although the voltage waveform that propagates through both runs will be essentially the same.

The high pass section of the speaker's crossover will block (or at least greatly reduce) the low frequency currents that would otherwise flow through the wires connected to its terminals. Likewise, the low pass section of the speaker's crossover will block (or at least greatly reduce) the high frequency currents that would otherwise flow through the wires connected to its terminals.

Your comment would be applicable if the jumpers were left in place while bi-wire cables were being used.

Regards,
-- Al
John, envision a simple two-way biwired speaker, the speaker having a capacitor in series with the tweeter and an inductor in series with the woofer. An essentially identical full-range VOLTAGE waveform will propagate from the amplifier to both sets of terminals on the speaker, as I indicated above. However, since the tweeter and its associated capacitor are in series with the wires that provide a path between the amplifier terminals and the high frequency terminals on the speaker, low frequency CURRENTS cannot flow through those wires. Whether that capacitor is within the speaker or "before" it makes no difference with respect to that current.

Likewise with respect to the low frequency section of the speaker. The inductor will prevent high frequency currents from flowing through the wires connecting the amplifier to the speaker's low frequency terminals.
One can hook a loudspeaker up to your supposed treble run and signal will be full range to loudspeaker.
Yes, because the full range speaker will have a low impedance across the full frequency range. Whereas in the biwire situation the impedance looking into the high frequency terminals will be very high at low frequencies (resulting in little or no current flowing at those frequencies), and the impedance looking into the low frequency terminals will be very high at high frequencies (resulting in little or no current flowing at those frequencies).
Or simple swap of treble run to woofer would prove my point.
Low frequency currents will flow through whichever wires are connected to the low frequency speaker terminals, and high frequency currents will flow through whichever wires are connected to the high frequency terminals.

Regards,
-- Al