What is the best premp for Atma-Sphere MA-1 3.3 amp?

Room size is approx 16' x 26' with 10' ceilings. M-60's with Zero Autoformers (not enough power) Bricasti amplifiers as well as Merrill Audio Veritas and even tried the new Merrill Element 118's. There were other amps as well and again just could not get the SL 545's to sing.

(Dealer disclaimer) 

So, do you think 545 was just too small for your room?  Not because of weak amp?

Room size is approx 16' x 26' with 10' ceilings. M-60's with Zero Autoformers (not enough power) Bricasti amplifiers as well as Merrill Audio Veritas and even tried the new Merrill Element 118's. There were other amps as well and again just could not get the SL 545's to sing.

@sksos M-60s with ZEROs simply won't have enough power to make the Sound Labs play. Just as a FWIW: amps that have an extremely low output impedance like the Element simply won't be able to play a speaker like the Sound Lab- there likely was nothing wrong with the speaker; it just wasn't being set up properly. In a room of that size you'll need some power! For more on how this works see:http://www.atma-sphere.com/Resources/Paradigms_in_Amplifier_Design.php
Sound Labs (like all ESLs) are not Voltage Paradigm devices. So amps that can double power as the load impedance is cut in half aren't going to work very well on them. Sound Lab is by no means the only speaker that is a Power Paradigm device- lots of horn a full-range single driver (example of the latter: ZU loudspeakers) are as well. SETs fall into the category as well.

I know that Atma-sphere amps don't change power output according to speaker impedance. Are there any SS amps that have this type of response?  I couldn't find any.