The arrangement you described (M-200 plus one channel of 770) would bi-amp them, but I'll leave the potential benefits to some of the local gurus -- the absence of an external crossover in the bi-amp arrangement is going to do the most to reduce the benefits. As for bi-amping using only the 770, you could use two channels of the 770 to drive a single speaker (just substitute an unused channel of the 770 for the 200 in your original arrangement), with very similar benefits and limitations. You could also bi-wire with the 770 -- connect the 950 pre-amp output to the 770 without splitting it, then connect both speaker cables to the binding posts on that channel of the 770 (I do this for my mains and center using spade connectors).

If you lost the jumper plates to connect the low and high binding posts, you can use a short length of speaker cable instead and eliminate the bi-wire/bi-amp cabling.

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