There doesn't seem to be anything wrong with what you're planning to do. Use wire of reasonable quality (shielded single strand is probable better), copper is fine.
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The NAD T750 being a receiver, not really a 5 channel amp, you need to make sure it can be setup to send a full range stereo signal to ALL channels ALL the time. For instance the rears channel amps may produce a signal only for a DSP generated surround sound. Same with the center.
If you can figure this out, then if more pwr will make the speakers sing and you have it, why not use it. I would recommend u go to Home Depot and spend $15 on 14g copper wire for multiple runs of speaker cables. Use this and experiment before buying cables.
I wouldn't bi-amp with two different power levels. You would have 50 W going to the woofers (or tweeters) and 30 W going to the tweeters (or woofers.) I guess you could balance that out with the gain settings but that also assumes that you can do a full range out on all channels like "Mybuddy" was talking about. Anyway, I would probably just run the two 50 W channels to the speakers and be happy (or sad.)
Monitor Audio speakers like to be bi-wired, so as a minimum do it if you can. Bi-amping will work as long as your NAD can send an unprocessed L/R signal to the rear channel. The difference in power output between the front and rear channels will not be an issue. Run the front channel to the woofer and the lower powered rear channel to the tweeter.
The difference in power output between the front and rear channels is already an issue. We've seen to that.
The speakers were designed to give you a nice balanced frequency response. Having a different power level to the tweeters/midrange than to the woofers will mess that up, to some degree. It may not be a big deal, you might even like the way it sounds better. Who really knows at this point? You let us know after you try it.
Okay, well, it looks like I just got some Silver 3i's, so as soon as I get them, I'll biwire them with mediocre wire and check it out. I'll stay away from biamping them with what I have due to the potential complicatedness of the situation. Anyway, when I run the receiver in 2 channel mode, I get 60W instead of 50W. I've heard these speakers on less power and thought it sounded the same as on an amp with more power (only it was quieter, so I had to turn the knob up).
Any suggestions on specifically what kind of wire to buy?