Zu speakers with Atma-Sphere M60 amplifiers

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.

Check out this thread, toward the bottom:

http://forum.audiogon.com/cgi-bin/fr.pl?cspkr&1259232779&openfrom&10&4#10

Ralph says he likes the Druid better with the M60s than the S30. If the Definitions are similar, they might follow suit.

David

Regarding impedance, which is what is important when discussing matching to Atma-Sphere amplifiers, the Definition and Druid are two completely different speakers.

Definition MK2 - 6 Ω nominal full bandwidth; 8 Ω nominal from 40 Hz - 35 kHz equal weighting

Druid - 12 Ω (nominal full bandwidth)

Considering these specs, and the fact that the S-30 has a higher output impedance than the M-60, it stands to reason Ralph would prefer the Druid with the S-30.