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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
 

With V-caps and the 3.3 upgrade, I also opted for having dual speaker binding posts installed on each unit. My DIY external crossover was made so that each driver is independent of each driver. I thought that would be a nice add on. Ralph thought so also.

Ralph told me that this Friday they will be playing my M-60’s. I’m hoping that means its at the last stage and will be shipped soon.

I feel like a kid waiting for Christmas!

ozzy

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
4,444 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
7,466 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
5,807 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!
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