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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
 

Well it seems that my used M-60's that are at Atmasphere getting updated to the current model did have the power supply upgrade and the V-Caps previously installed. However, the V-Caps were the tin foil version not the latest version with copper. So, I still decided to go with the latest copper version, but I asked for the tin foil caps to be returned with the unit.

Looks like it won't be shipped out till next week. Darn...

gdnrbob
4,444 posts
 
Your patience will be well rewarded.
B
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

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