I agree with Rumadian - the key is low damping factor. Hawks love amps with low damping factor. It just lets them open-up and gives them a huge amount of body.
IMO you need a stable damp, but the watts aren't hugely critical.
I've run Bryston (3B-ST: plenty of power, plenty stable) with Hawks and it sounded good, but honestly a vintage Sherwood S-8900 (top-of-the-line vintage receiver from the days when a top-of-the-line Sherwood was as good as Mac) with 60 watts and a much lower damping factor than the 3B-ST sounded amazingly superior. Anyone could hear the difference immediately.
IMO you need a stable damp, but the watts aren't hugely critical.
I've run Bryston (3B-ST: plenty of power, plenty stable) with Hawks and it sounded good, but honestly a vintage Sherwood S-8900 (top-of-the-line vintage receiver from the days when a top-of-the-line Sherwood was as good as Mac) with 60 watts and a much lower damping factor than the 3B-ST sounded amazingly superior. Anyone could hear the difference immediately.