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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

Showing 1 response by sbank

sbank's avatar
sbank
3,378 posts
 
@ozzy, the M60s are great amps and they should be a super match with your new speakers WITHOUT zero transformers. Congrats. @charles1dad is correct, it's all about the impedance match not about bass (sorry Meghan Trainor!) 

FWIW, IMHE those much praised zeros can cause a greyish, whitish haze over the music that really ruins it for me. I would never make them part of the solution. There are plenty of speakers better suited to OTLs, you shouldn't need them. Cheers,
Spencer
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