No, they can be bi-amped but not tri-amped.
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I wish they could be triamped.
I'm bi-amping mine using four Manley 250 monoblocks.
I think a single pair of Atma-Sphere MA-3s would sound quite nice with these speakers.
As you can see, the fact that I don't like box speakers or solid-state amplification is costing me a small fortune.
(But it's worth every penny :-)