Amps Atma-Sphere M-60 Mono blocks OTL design


I just purchased a used OTL Atma-Sphere M-60 mono blocks that I have sent to Atma-Sphere to be upgraded to the current model 3.3 and I also added the option of a higher quality power supply and V caps.

I have sold my old trusted Eggleston Andra 2’s speakers and have built some monitors using Aurum Cantus ribbons (102db) and Aurum Cantus midwoofers (90db) that are both rated as 8 ohm nominal. I have a DEQX Premate and will be crossing over to (2) JL Audio F-113 subs at 80hz.

Currently I am using a solid state high power stereo amp (Pass Labs) that I used with the Andra 2’s.

The Atma-Sphere M-60 is rated at 60 watts class A and is said to work better with higher impedance loads.

It will probably be a few weeks until I get the M-60 and was hoping someone could provide opinions of what to expect.

I listen to late 60 early 70’s classic rock music mostly. Sometimes loud.

ozzy

128x128ozzy
As an owner of 'vanilla' MA-1's, I can say they exceed all my expectations. I can hardly believe that he can 'improve transparancy' or 'smoothness'. But, now you got me thinking maybe I should....
Bob

Finally got the Treo's installed and with the Atma-Sphere amp and pre, they sound wonderful.

Well it seems that my used M-60's that are at Atmasphere getting updated to the current model did have the power supply upgrade and the V-Caps previously installed. However, the V-Caps were the tin foil version not the latest version with copper. So, I still decided to go with the latest copper version, but I asked for the tin foil caps to be returned with the unit.

Looks like it won't be shipped out till next week. Darn...

With V-caps and the 3.3 upgrade, I also opted for having dual speaker binding posts installed on each unit. My DIY external crossover was made so that each driver is independent of each driver. I thought that would be a nice add on. Ralph thought so also.

Ralph told me that this Friday they will be playing my M-60’s. I’m hoping that means its at the last stage and will be shipped soon.

I feel like a kid waiting for Christmas!

ozzy