Friend of mine had the same problem with his Maxx 2's, large room and kept blowing the mid-range. SPL's not high either.
He traded for SoundLab U1-PX's after he heard mine. IMO its worth auditioning electrostatic speakers.
Couple of quote from friends who own large hi-fi stores: (1) "On Saturday I had an interesting situation in the store, in one demo room I had ML's new CLX being driven by Ref 7&3 & Evo 600 mono's. In another room Maxx 2 & FBI & 505CD, It was chalk & cheese the CLX system was totally organic whilst the Maxx 2 set up was pure 'Hi-Fi'....
(2) "No offense to Dave Wilson but his designs have always been hi-fi to me and its no accident that his first speaker, the original WAMMs, had (and still do) two electrostatic elements in it. I am not a fan of the Wilson sound but I must say I like the Sophias and Watt 7s (not the 6s) in the areas where they are musically involving the lower mids. Gayle Sanders (Martin Logan) best effort was and still is the CL series of full range electrostatic and their latest CLX is their best effort yet. I think they lost the plot when they started developing hybrids and subwoofers/cone loudspeakers and home cinema.
It was people like Roger West (and Quad) who stayed true to the electrostatic loudspeaker and only redeveloped the Dynastat hybrid as a way of offering his electrostatic technology to a wider audience because of price. Roger once told me if he had his way he would make his full-range ESL even bigger a true wall of sound. Incidentally the first SoundLAB creation way back in 1978 was a hybrid design called the R-1".