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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
charles1dad's avatar
charles1dad
10,250 posts
 
Ozzy, 
I'm glad that the acquisition of the Atma-Sphere power amplifiers worked out well for you,  it's apparent that you're very pleased with their sound.  What is their most noticeable contribution to your system?
Charles 
ozzy's avatar
ozzy OP
7,652 posts
 

charles1dad,

I say its the purity of the sound.

ozzy

charles1dad's avatar
charles1dad
10,250 posts
 
Hello Ozzy,
Well, that says quite  a lot. Purity is immensely desirable yet hard to achieve, it goes hand in hand with naturalness.  This is the mark of genuinely top tier components IMHO.  Congratulations 😊
Charles 
gdnrbob
4,508 posts
 
So, Ozzy, you managed to do the calibrations without help from DEQX?
I am reading the manual. It is pretty detailed, but seems doable.(I still haven't finished reading it completely).
 My biggest concern is interpreting the graphs. Not so much the deviations of frequency but time and phase lag. Maybe it becomes clearer when using it.
Bob

ozzy's avatar
ozzy OP
7,652 posts
 

charles1dad,

Thanks!. I finally received my 1970's new Russian output tubes. With these tubes and my newer 1950's RCA driver tubes, I think I can finally be ready for the final voyage.

But, Ralph says for tube longevity to put these new tubes on standby for 72 hours before using them. That means no music until Tuesday night! Yikes!

gdnrbob,

Yes, I have done probably a dozen or more calibrations. But I guarantee no matter how many times you read the manual the first time you try it you will be going back and forth through the instructions mumbling words that you won't be proud of.

I still have a problem interpreting the impulse response graph and the corrections settings. But most everything else I could help you with. Al is also very knowledgeable about the DEQX and its settings.

ozzy


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