Bi-Amping with one amp?

...4 channels... only if the speakers you're hooking them up to have connections for bi-wire on the back.

The point is moot now. The Bryston has sold. Didn't even have time to try bi-amping.

"Thanks guys. The question was mostly out of curiosity. Not sure if I will actually try this but it is good to know."  

Even though the amp you wanted to bi-amp with is gone, it's still worth pursuing at some point in the future.  There are some very audible improvements to be had.  

Simple answer, as Eric said, is "yes and yes".
The question is how much benefit you'd get with 4 more-or-less identical amp channels.  Bi Amping has two main benefits that ic an think of offhand:
1. Separate the two loads so if one is demanding or near clipping the other is largely unaffected. Note if they share a common power supply this may not be entirely true. I'm sure the bryston does.
1A. this also often implies just plain more power. Which, all things equal, is always good.

2. Choose amps that better suit each task - good woofer control and lots of power for the bass; less power but "purer" (warning: meaningless subjective term!) sound for the mid/treble.  Might be tubes for timbrel warmth or a small class-A amp, or?????
I have npot had speakers that accept bi-amping for ages. But on an old customer's prodding, i did juts switch from a stereo amp to a pair of (identical) balanced monoblocks with vastly more power and the benefits of E2E balanced.  Its effortless, although at first blush one might say "sounds pretty much the same". It does, only slightly more dynamics, slightly quieter, and when things get loud, ...it just gets loud No drama.
G