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


Hi guys,

Today I borrowed home a pair of pure OTL-Tube M60 mononblocks to combine with my ML ESL 11s (which base are partially driven by a Class-D amplifer of 275 watts) with very poor results. Unfortunately, although the M60s where only to cater for the diaphragm panels (at least in theory), when combined with the speakers, the soundstage collapsed, vocals felt muffled and absent deep into the sound picture, almost hidden away, and the base went out of control (got larger and louder in a negative way). I also lost details. The Monos are a pair of brand new demos and shined this morning together with a pair of smaller Vivid monitors.

My current SS - a Bryston 4B3 delivers so much better combined with the ML ESL 11s. Someone that can explain what I did just experience? I thought that OTL tubes and High sensitive Martin Logans of todays generation where to be a marriage in heaven.

Kind regards 

 

  

andy_wonderwall

Showing 8 responses by andy_wonderwall

@atmasphere

Thanks for reaching out. 

First all of. Let me tell you the M60s sounded just fantastic with a pair of Vivid Kaya S12 in my local hifi shop. So intimate, wonderfully vocals. Organic sound. A midrange to die for. Got me intrigued. Maybe the Zeroimpedance could be one way to solve the problem. I know MLs are hard on all Tube designs. People who have been successful on large MLs seem to be those who have invested in some heavy "hybrid-tube" stuff from ARC or VTL (like 250watts and above in strength). How do you think the ma-2 would handle the ESL 11? Zeroimpedance, still to be required?

Kind regards

Andy

 

Hi Guys,

Thanks for your input! Indeed I know that the MLs are demanding when it comes to impedance, but I for sure has a learning curve ahead of me when it comes to OTL and Tubes in general. I guess I didn’t expect the same energy and presence in the room with only 60 OTL watts, but now I learned what is what. At least it was obvious that the MLs are designed in a way that they demand something else. Today I swapped the M60s in for a pair of MBL N15 monoblocks. These are designed to attack MBLs omnidirectional speakers and have plenty of power under their hoods to cater for Extremes etc. Going to be interesting to see how the ML fare under their command.

  • Analog toroidal transformer with protective shield
  • Weight. Ca 40 kg.
  • Continuous power (<1% THD, 8/4ohm) 352W / 615W
    Dynamic power (<1% THD, 8/4/2/1ohm) 402W / 786W / 1.50kW / 1.0kW

Some sort of Class D.

 

@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.

@bdp24

Thanks for advice. 

These speakers sounds interesting. Will not break the bank either. 

Its a shame no dealer in Sweden carries them. Would be interesting to listen to them to see how they compete (in my ears) to a pair of large MLs.

KR

@decooney 

A Theoretica Applied Physics Bacch SP-adio. It is a crosstalk eleminating sound processor with a DAC doubling as a pre-amp. Works gr8 for me. But combining with a nice tube preamp is also something to consider! 

@gdnrbob 

The pair I am borrowing are a pair of demos. Lets see at what price point they are for the moment.

…and you are right. They probably can handle any loads. Sounds terrific and have outgunned my beloved Bryston in most areas, Ive learned during the course of this day.