Many moons ago I bi-amped a pair of Arcam amps with, I think, Monitor Audio Gold Ref 10s, though it may have been Neat SXs.
I really enjoyed the set up and experimented with one amp in mono mode per speaker then one amp stereo mode, one for treble, one for bass.
I can't remember which I favoured but either way bi-amping really opened up the sound and I've never gone back.
With my current Crofts I have one 7R per speaker as there's no stereo option so I can't try splitting them by bass /treble, only by left / right channel.