Zyx Universe. O.24 mv vs .48 mv with low eff spkrs

I haven't heard the UniII, but having heard the Uni in Doug's system, I can only imagine how good it is. Now go out there and get some speakers that are designed for that kind of an amp...look out!!!! You may not be getting much sleep for a while.

swampwalker

I have Daedalus Ulysses on the way which are right getting Lou's V2 upgrade

I never get much sleep with all my hobbies
usually it's live music

Audiotomb- Never heard the Daedalus at any length but I know Almarg loves his. Enjoy. And don't miss any live music to listen to the hifi. It's great fun but it's not the real thing, as I am sure you know.

05-23-14: Swampwalker
My own experience is that you do have to be somewhat concerned about hum and noise when you go to very high eff speakers; the higher eff the more careful you have to be....

Relevant to this point I see that the MA-1's description (under the "order" tab) indicates that the following are available:

Jumper plugs for high efficiency speakers -- Replaces tube in the voltage amplifier section of Atma-Sphere power amplifiers, thus reducing gain for high efficiency speakers. Recommended when efficiency of speaker is over 100.

As I indicated earlier the efficiency of the Ulysses is spec'd at 98 db/1W/1m, and I suspect that you won't have any issues with hum or hiss. But considering the high gain of your preamp I wouldn't completely rule out the possibility that you might find yourself operating the volume control undesirably close to the bottom of its range. In which case these jumper plugs would appear to be a solution.

Enjoy! Regards,
-- Al

Those jumpers are an under-appreciated option on Atma amps. Did wonders in my system when I had an S30.