Atma-Sphere M60 monoblocks + ML ESL 11 = Inferior combo

Good observation, @audition_audio. Just one of the things that makes the RM-200 as unique as it is. And he gets 100 watts out of a pair of KT-88’s not by driving them hard (which of course shortens their life, something Modjeski was very much opposed to), but by creative engineering. How he did it can be discovered with a little research.

Modjeski often said he only introduced a new amplifier when he had something new to offer, not just to fill a market need. He gave talks at two or three of The Burning Amp Festivals in San Francisco, sharing the stage with Nelson Pass, one of the few of his contemporaries he held in high regard. Those talks were videotaped, and may be found on YouTube. Essential viewing!

Andy, Roger Modjeski designed his Music Reference RM-200 tube amp specifically to deal with low-impedance loudspeakers. When they occasionally become available on the used market, they fetch around $2,000 for the original version, a grand more for the Mk.2. A pair of KT-88 tubes are used to create 100 watts (per channel), into all impedances. The RM-200 is a VERY unusual tube amp.

In his original review in Stereophile, Michael Fremer placed the amp in the mag's Class A Tube category, and in a follow-up review found the Mk.2 iteration to be an even better amp. It has remained his "moderately"-priced reference tube amp for over a decade, and he recently declared the RM-200 MK.2 to be one of his most-cherished hi-fi possessions.

Too bad more audiophiles don’t investigate the suggestion of @ticat, myself, and a few others, and look into the Eminent Technology LFT-8b. A planar-magnetic loudspeaker, in some ways very much like the Magnepan, but in other ways dissimilar.

The LFT-8b is more like an electrostatic than are Maggies, in both sound and power amp appropriateness. No offense to either Magnepan or owners of their outstanding loudspeakers (I have owned four pair, one currently). But if you want a planar loudspeaker that will mate with the Atma-Sphere M-60 (or generally any tube amp), the LFT-8b is a great option. It’s modulus-of-impedance is a very even 8 ohms, the p-m panel itself (which sits atop a sealed 8" dynamic woofer for the reproduction of 180Hz down, via a second set of binding posts) an almost ruler-flat 11 ohm load, ideal for all tube amps, none more so than an OTL such as the Atma-Spheres (with which I am very familiar, having used a pair of M-60’s with my QUAD ESL’s, a/k/a 57’s).

Despite very positive reviews in The Absolute Sound, Hi-Fi Choice, Hi-Fi World, Hi-Fi Pig, Positive feedback, and from Harry Weisfeld of VPI (who declared the LFT-8b to provide the best midrange reproduction of any loudspeaker he has ever heard. The ET LFT driver reproduces 180Hz to 10kHz, with NO CROSSOVER!), U.S.A. audiophiles continue to ignore the best value loudspeaker (imo) of any on the market.

Part of that blame can be attributed to the low number of Eminent Technology dealers (which pales in comparison to those of Magnepan), but E-T will ship you a pair to audition in your system. Some E-T owners prefer the LFT-8b to not only the Magnepan MG-1.7i (I have heard both---it’s not even close), but also the MG3.7i, which retails for more than twice the price of the LFT-8b.

I expect this post will be ignored as have been all like it in the past. It’s your loss, not mine ;-) .