Bi-wiring with different metals?

I didn't think different conducting metals would create phase/timing issues over such a short run (8ft) but it costs nothing to ask!
My question was inspired by having bi-wireable speakers, and equal lengths of heavy copper cable and silver cable; I might give it a try.

As for Musicnoise's experiment, I might get around to that when I have a bit more time; I don't think I can vanish into the front room for that long without raising the ire of the wife & kids!

Carl
Were you able to ever conduct Musicnoise's experiment? What were your results? Has anyone been able to do the test above and care to share their results? It sounds really cool but I could never execute it. No time or patience on my part. I'm getting listening fatigue from my system right now and it may be the new Zu Wax SCs I just got. I'm just starting the 200-300 hour break-in time. If the fatigue doesn't subside after some time I was thinking about using silver SCs on the highs of my Kefs and the Zu Wax on the lows. They are really nice well built cables.

I have a pair of PS Audio XStream Statement Bi-Wire speaker cables. Bought 'em on closeout in 2005, so they were probably a 2003 or so product. When they were manufactured, they were the only cables designed specifically for bi-wiring. That is, the bass run was optimized for LF transmission and the treble run was optimized for midrange/treble. As such, the bass includes 3 or so very thick solid core copper conductors making for about a 6 ga. conductor. The treble run consists of smaller strands of silver-plated copper. For my bi-wirable Mirage M5si's they were just what I was looking for. They soundly trumped the MIT MH-750 double run I'd used before, and the signal transfer is so efficient I no longer felt a need to bi-amp these speakers.

The transparency and immediacy of the speakers improved significantly and the imaging and treble are very nice. Physically these cables are ridiculous--2" diameter and they weigh about 2 lbs. per foot per side. The cable is so heavy it's been known to snap off the banana plugs and I use a C-clamp to keep the cable from pulling my center channel speaker off its shelf.

But the sound makes 'em worth it.

It is just vaguely possible for thermoelectric effects to be audible. Probably NOT on speakers, but almost certainly on MC phono, where such effects could amount to a couple MV DC.