Best amps to use with Sound Lab speakers

I had tried a number of hybrid amps, like the modified NYAL Moscode 600, which gave a nice presentation. Unfortunately, my Sound Lab M-1's could not play loud enough or with enough punch. I was also using a passive line stage. The switch to the Bel Canto PRe-2 with the Bryston 14B-SST did the trick.

I am using David Berning Quadrature Z amplifiers on A-1PX speakers with beautiful results.

I am using audiovalve challanger 180 monoblocks with great results.