Andy, Ignore my two posts below, my attempt at humor.

What all the reply posters are suggesting is that there is no benefit from
bi-wiring. Several of these posters have undertaken extensive measurement
and also listening tests re bi-wired compared to a single run of two core
wire to speakers.

The only benefit to be seen from bi-wiring is to reduce the resistance of
the wire between amp and speakers. Two sets of wire will have lower
resistance then one set of wire. As several posters here will state, you can
do just as well by strapping two cores of wire together (parallel) to give
twice the cross section of wire and thus lower resistance. This is only
relevant if the core of the wire you are using is not of adequate cross
section for the power being fed to the speakers.

My suggewstion would be don't pay big dollars for exotic speaker cables and
prove to yourself if bi-wiring works or not.

If your amp has two sets of switchable speaker connections then connect one
speaker with one pair of cables to Speaker A connection, connect the other
speaker to Speaker B connection using bi-wiring. Use your standard length of
cable as you normally would. Put your speakers side by side and put your amp
on Mono and play some music. Switch between bi-wired and standard wiring
with your speaker selection switch. Get a mate to do the switching, you sit
10 foot back and don't look and have him switch between speakers in a manner
thar results in you not knowing which wiring is active and see if you can
tell the difference.

Get back to us here and let us know the results.