Zu speakers with Atma-Sphere M60 amplifiers

You can safely remove output tubes from each amplifier to reduce power output and heat.

Good luck.

Dealer disclaimer.

If you have to much gain (very little volume control) you can also replace V2 with a jumper plug to lower the amps gain. I run Avantgarde Duo Omegas with M60s with only 4 tubes per amp and V2 jumper-ed out. Atma-Sphere can set you up with a pair of plugs or you can DIY them if needed.

you might ask Zu (Sean) to make sure the impedance is correct for OTLs---as I recall, you can have this adjusted at the factory.

05-09-10: Keithr
you might ask Zu (Sean) to make sure the impedance is correct for OTLs---as I recall, you can have this adjusted at the factory.

That's a good point. Certainly worth checking with Zu Audio, but be certain to tell them specifically which amp is being used.

As I recall from a dealer who once sold Zu Audio and still sells Atma-Sphere, the tweaked Zu impedance was more important for use with an Atma-Sphere S-30 amplifier. The output impedance of the M-60 amps is lower than the S-30.

Hi folks:

Thanks for the guidance here. I know the factory can implement a mod that increases the impedance but I thought that if I changed amps for any reason, the factory configuration would be more forgiving with most other amplifiers. I'm happy to hear the M60s will drive these speakers adequately.