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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
ozzy's avatar
ozzy OP
7,653 posts
 

gdnbob,

I can’t really comment about DEQX support. ( I hope I don’t have to find out). In actuality the DEQX is more complicated than the on line info shows. But, many of us are now mastering all the quirks and can help you. I must say the finished calibration does not sound in any way digital or with the negatives I have experienced with previous room correction devices. (The current one that comes to mind is the DSPeaker).  The DEQX is the real thing!

bugredmachine,

Now that I’m getting more time with my Atma-Spheres I am so impressed that I can’t imagine anything sounding better!

The heat in my audio room will increase about 4 degrees, IF I have the amps on all day.(12+ hours). This amount is probably not much more than when I used the Pass Labs the same amount of time.

I must add that Ralph at Atma-Sphere is a A+ dealer and will provide help when needed. Highly recommended!

ozzy


o_holter
980 posts
 
In my experience, amp / speaker / room matching is the way to go with OTL amps. I can get my MA-1s to sound okay with 8 ohm speakers but I chose speakers that have been developed for OTL (Audiokinesis) and have not looked back. It is only then, that you fully hear what the amps are capable of.
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
7,653 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 
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