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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
bigboltz
55 posts
 
ozzy, 

So you're the one keepin Ralph and his crew busy!  I'm waiting on an MP-3 that is being updated to 3.3.  The wait is torture!  I finally found a unit on the used market, but it was a very early model. I did get lucky, as the seller was in Minnesota, and kindly offered to drop it off. Its been a few weeks now, but I'm sure it will be worth the wait.  It will be replacing an AtmaSphere UV-1, and feeding a pair of M-60 3.1 driving Vandersteen Quatros.  I cant wait.  Though now I'm probably gonna want to send in the amps for updates... 
gdnrbob
4,445 posts
 
Bigboltz, do the M-60's have enough power for the Quatro's? I ended up going with the MA-1's because I thought it would be a bit too much for them.
BTW- My MP-3 took a while to complete, mostly due to the remote option, but as I said to ozzy, your patience will be rewarded.
B

ozzy's avatar
ozzy OP
7,467 posts
 

bigboltz,

Sorry, I'm waiting also. It probably will be a few more weeks before I get them. Hopefully sooner, but they are waiting for some electrolytic caps to arrive.

gdnrbob,

Thanks, I don't know about you but its hard to be patient when there are several if's that need to be explored. Such as; will it have enough power for my DIY speakers? I think so, but until I can place it in my system I can't be sure. Will I like the sound quality more than my Pass Labs equipment etc.? We'll see.

ozzy

jond's avatar
jond
5,810 posts
 
ozzy took a look at your pics nice job on the new speakers! Congrats on your new amps also, I've only heard atma-sphere amps once, at the Capitol Audiofest this summer, and the sound was fantastic. I am sure you will be very happy and finding out your amps are more up to date than you thought is a very happy outcome in a used transaction! Hang in there and savor the anticipation!
bigboltz
55 posts
 
gdnrbob

The M60s drive my Quatros with no problem.  I rarely get past 12 oclock on the volume and its more than enough.  Vandies have a rep of liking alot of power, but are a fairly easy load. 8ohms pretty much strait across. Plus, with the powered subs and hi-pass, no issues.  I thought about the volume control, but I'm already stretching my budget. What do you think of it?  

And I'm really curious about the phono stage. I'm hoping its great, I sold my Allnic 1201 to make this possible.  Tell me I wont be too disappointed!
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