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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
 

jond,

Just a crazy ole' audiogonner gone wild!

ozzy

ozzy's avatar
ozzy OP
7,466 posts
 

Atmasphere,

So, should I place the Zero’s before or after the crossovers?

ozzy

atmasphere's avatar
atmasphere
11,806 posts
 
If you put the ZERO after the crossovers then the crossovers won't be operating the way they were supposed to. So before.

Now if I got this right, your speakers are home made? Could you build 16-ohm speakers? Then no need for the ZEROs at all.
ozzy's avatar
ozzy OP
7,466 posts
 

Ralph,

Thanks again for the help.

At this point, I have spent a great deal of time, effort and $$$ to get speakers and the proper crossovers for an 8 ohm load.

But, that being said the M-60's still sound very good without the Zero's.

ozzy

ozzy's avatar
ozzy OP
7,466 posts
 

Well I just placed the 2nd pair of Zero's into position.

Wow! what an improvement! 

Now, with biwiring and the dual Zero's there is much more detail in the bass, mid, treble along with better dynamics.

Ralph and others this is truly the best I have heard thus far with the M-60's.

ozzy

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