Tom - most are using Axiom's own amps, which work very well. I have 10 channels of ADA-1500's ... others have ADA-1000's (which I tested, and they were excellent) and ADA-1250's.
The options are almost endless within Axiom's own amps, including a monobloc version of the ADA-1500.
For value, Axiom also does special deals when combining their amps with the Active LFR-1100's.
Other options outside Axiom can also work great - the speakers are pretty efficient.
Do you have a budget in mind? What is your room size?
