biwire trick

If the wires are the same type and close to the same length and are all grounded together at the binding post on the amplifier end then this cannot possibly make any difference at all - unless you fixed a poor contact when making the change or unless you concentrated harder than usual trying to discern a change (in which case most people do hear a change or think they do - due to the placebo effect)

Just about everytime some kind of change is made, you always read this comment :

but the sound definitely improved: fuller, more natural, larger stage

And agree with Shadorne's comment :

or unless you concentrated harder than usual trying to discern a change (in which case most people do hear a change or think they do - due to the placebo effect)

Shadorne and Riley804, I'm not so sure.

Keep in mind that the swap Tholt is describing will result in different frequency components flowing in the + leg and the - leg of each two-conductor pair of wires. It seems to me that would in effect amount to a change in the inductance of the cables, because the magnetic fields associated with current flow through adjacent conductors would no longer be equal and opposite.

As you probably realize, depending on cable length, cable type, and the impedance of the speaker at high frequencies, speaker cable inductance can sometimes have a significant effect on upper treble response. And upper treble response would seem to be something that can subjectively correlate with soundstaging.

The connection swap would also reduce the degree to which any noise pickup that may occur is common mode. I would not expect that to generally be significant in an amplifier-to-speaker connection, because of the low impedances and relatively high signal levels that are involved, but I would be hesitant to totally rule out the possibility.

As you know, I am certainly one who tends to be skeptical about a lot of tweaks that are reported, but in this case I would not rule out the possibility that the differences were real.

Best regards,
-- Al

you guys just got almarged.