I have identified one theoretical reason why biwire may be helpful, Forget about the Hot speaker wire: look at the return. The return terminals of the woofer and tweeter are tied together, and then returned to ground through the non-zero impedance of the speaker cable. This provides a mechanism for the two drivers to interfere with each other. Separate return wires would eliminate this.
Another thing that I have done, and which seems to be a success, is to replace the tweeter padding resistor with the resistance of small-size tweeter cable. In my case this is easy to do, because the tweeter padding resistor is externally mounted and its value is easily changed to suit listener preference. With my MG 1.6 I like one ohm. So, I made the tweeter wires so that they have one ohm, round trip. The main advantage of this approach is cost reduction. I was able to biamp three speakers for about $8.50, and I still have some wire left over.
Did biamping help? Don't know. They sounded good before, and they still do.
Another thing that I have done, and which seems to be a success, is to replace the tweeter padding resistor with the resistance of small-size tweeter cable. In my case this is easy to do, because the tweeter padding resistor is externally mounted and its value is easily changed to suit listener preference. With my MG 1.6 I like one ohm. So, I made the tweeter wires so that they have one ohm, round trip. The main advantage of this approach is cost reduction. I was able to biamp three speakers for about $8.50, and I still have some wire left over.
Did biamping help? Don't know. They sounded good before, and they still do.