Glenn Richards wrote:
APR wrote:

All you are doing with bi-wiring is placing the terminal that joins
the the LF and HF driver circuit inputs at the amp terminals instead
of the speaker terminals. If the speaker wire is so inadequate that
you are able to measure any significant changes in HF linearity due
to the effect of speaker wire resistance then the wire run is too
long or the wire is too light.

Ok, for those people that still don't "get it", here's an experiment
that will demonstrate visually what's going on:

Take a 12V DC power supply (one of those bench PSUs capable of supplying
several amps will suffice) and a 12V 1W bulb (any type will do, it's
easier to perform the experiment using a MES bulb and batten holder with
screw terminals though).

Connect the bulb to the power supply using 5 metres of 13-strand zip
wire and power up. Observe the brightness of the bulb.

Now take a second bulb and holder, and attach a few inches of the same
wire to the second holder. Connect the second bulb in parallel with the
first so that it is "chained" from the first bulb, ie you've got 5m of
cable from PSU to first bulb, then a few inches from the first bulb to
the second bulb. Make this connection with the power turned on.

As you connect the second bulb, you'll see the first bulb's brightness
decrease. This is caused by a voltage drop in the cable. Disconnect the
second bulb and the brightness of the first will increase again.

Now replace the short piece of wire on the second bulb with another 5
metre length, and connect the two bulbs in parallel by attaching two
sets of wire to the power supply. This time when you connect the second
bulb the first one won't dim, and the second will light up at full
brightness.

This is exactly what is happening with your speaker cables. The cable
run acts like a series resistor, and the load (in this case the driver
voice coil) causes a voltage drop across that series resistor. By
bi-wiring you are avoiding the load from the LF driver causing a voltage
drop to the HF driver. (Again this is a greatly simplified description
of what's going on.)

No it isn't! Your experiment is being done with dc. Repeat the
experiment with 50Hz to one bulb and 10kHz to the second bulb, both
bulbs being fed through a single amplifier and fed through a simple
capacitor or inductor "crossover". You will now see that the bulbs don't
change their brightness.

S