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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
7,466 posts
 

atmashere,

Does the usage of the Zero’s draw more AC current? That is in monthly energy cost?

I ask this because the M-60's meters move a little now.

ozzy

realdeal
63 posts
 
There is always way  to design an OTL without using the ZERO,an OTL with  output transformer?? 
dragon_vibe
430 posts
 
If you want my opinion on someone who owns the M60, The New Nirvana OTL Amp from Atma-Sphere and the MP3 as well as the MP-1.

Their is nothing that comes close to OTL Sound when paired with the right speaker your more or less at the end of your journey. These amps will give you transparency that only more expensive Solid state amps can achieve. A Sound which is neither Tobey or SS. Goose bumps during listening and a feeling of being their at a live event. Iv exchanged audio gear for the past 20 years and when I heard OTL nothing ever seems the same or sounds good enough. Speed, PRAT, Expansive Soundstage, Emotional Feelings, Live Sound, Transparency. The Amplifier just sounds like it does not exist. Their is hardly any colouration or distortion.

Personally i think Ralph sells his gear too cheap, the only gripe with OTL is they need to be paired with a good Speaker but their are alot of options on the market and if you cant find one suitable then the Zero can help you out.
ozzy's avatar
ozzy OP
7,466 posts
 
realdeal, dragon_vibe,

I still can’t believe how great the sound quality is with my updated M-60’s.
I am using dual Zero’s with my DIY bi-wire speakers and will not turn back. With the Zero’s I noticed no degradation in sound quality but they sure did allow my DIY speakers to really open up. Especially in tone.

Now, I have such a soothing sound but detailed and with a wide open soundstage. I never came close to achieving this sound with solid state amps.

ozzy

tzh21y
1,654 posts
 
great amps.  listened to them many times.  very nice
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