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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

ozzy
jond's avatar
jond
6,057 posts
 
ozzy between this and your graphene contact stuff experiment I think we need to dub you "The Tinkerer"! Not sure I've ever seen someone do so much to their system in such a short period of time ;-) glad you're having fun and keep keeping us posted!
charles1dad's avatar
charles1dad
10,250 posts
 

Hi Ozzy,

IMO there's no specific areas to really analyze. I'd just listen to a variety of music you enjoy. Your ears and spontaneous response to what you hear will determine the best combination for your listening.

Charles

ozzy's avatar
ozzy OP
7,645 posts
 

jond,

Yeah I never should have retired. Too much time on my hands... but I'm really enjoying myself.

charles1dad,

Thanks, so far it seems that as I increase the multiplier the music comes  forward. But I need to investigate further.

ozzy

ozzy's avatar
ozzy OP
7,645 posts
 
Well I think the best is the 2x connection. In a few days I will remove it and hear the amps solo to compare.

ozzy

gdnrbob
4,507 posts
 
Not to be a pain, but I wonder if you should leave the transformers set at a connection for a period of time.
I only say this because, when I adjusted my Vandy M5-HP crossovers, Johnny Rutan said they need to settle in for a few days before they exhibit their true character. This situation may be different, but I thought I would post my thoughts with the hope of having you make the best informed decision.
(BTW- I recall reading that Steve McCormack felt that the Zero Transformers made a significant difference even with his SS amps).
Bob
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