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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

128x128ozzy
ozzy's avatar
ozzy OP
7,542 posts
 

I just found a used set of the Zero-Autoformers for a good price. Perhaps next week I will be able to try them with the M-60's to see if they provide any benefits with my DIY speakers.

ozzy

atmasphere's avatar
atmasphere
11,960 posts
 
Yes, but can the M-60 power these to rock music levels?
I play in a rock band. Audiophiles in general don't play **any** system to rock levels :)
charles1dad's avatar
charles1dad
10,250 posts
 
Ozzy, 
I'm interested in your findings with the Zeros due to mixed results I've read about.   Your easily driven speakers could sound better without the transformers. 
Charles 
ozzy's avatar
ozzy OP
7,542 posts
 

armasphere,

I didn't quite mean rock concert levels.

charles1dad,

Yeah, I concur, but this will complete the process of trying to get the best out of the M-60's.

ozzy

gdnrbob
4,460 posts
 
Keep us posted. I, too, am interested in what you discover.
B
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