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

@andy_wonderwall no worries, and sharing some of the same, probably should have mentioned I run custom made hybrid electrostatic speakers on dual mono tube amps myself. 6ohm, 93db sensitivity would seem easy to drive. Not as much as I hoped with prior attempts using lower power parallel single ended amps in strapped triode mode. Back and forth I went with higher powered tube and revisiting some capable SS amps to find the best match. Your Atma 60 amps and your 4B3 amps are both on my bucket list. I can imagine your 4B3 amp lights those MLs up. When I put a good SS amp on my hybrid ES speakers, it does open a larger door and deeper room into what a capable electrostatic speaker can do.

If I had your Atma 60s I’d be fast on the hunt for a good matching speaker just to be able to truly appreciate and hear those fantastic tube amps. Your 4B3 solid state would be a nice match for my own speakers, and have kept that on my favs list to acquire as a future keeper amp. Lucky challenges to have, you have great taste, happy listening to both :)

ML's + Zero auto transformer = Very good sound. Used that set up for years.

BTW... same PP 40w tube amp + ET LFT8 = similar sound but no autoformer required.

My 11As sound far better with the Lux 509X than they did with ARC Ref 75/3 combo. Albert Sportis turned me on to this synergistic pairing after he told me of his extensive experience. Great guy.

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 ;-) .

@decooney

Thanks for good advice. And yes. Both types of amplification, stellar in their own way. If I ever would have the budget to have a smaller separate system the M60s would be on the list together with speakers suited for the technology. But for the moment I am focusing on a large scale system with the ML´s 11s as foundation, (alternative ever the larger 13s one day). So I need to adopt suiting amplification. The 4B3 is an excellent partner! That SS has a lush sweet bold powerful sound together with the MLs for sure. Could definitely be my end game. But what would this hobby be without setting new personal frontiers? Another mountain to climb :-)? I am lucky to have a dealer that are willing to borrow me MBL N15s monoblocks so that I can compare different technologies on the MLs.