perfect speakers for atmasphere amp and preamp

Merlin VSM, Soundlab, Classic Audio Reproductions.

Most good ones with the right sensitivity and the higher the impedance, the better. IMO the autoformers negate much of the otl advantage.

Probably many or most of the models mentioned in this thread about high efficiency speakers, although the power capability of your MA1's may be overkill for some of them.

Coincident and Devore would undoubtedly be good choices to consider, as would Daedalus. The Daedalus Ulysses, which I own, are nominally only 6 ohms, but are a very benign 6 ohms in terms of the flatness of their impedance vs. frequency curve, and also, I'm fairly certain, in terms of avoidance of significantly capacitive phase angles, especially with the all-poly crossover option that is offered. See the comments near the end of that thread by Jazdoc, Atmasphere, and others.

Regards,
-- Al

Wilson, Audiokinesis, JM Labs, Vandersteen, Coincident, Daedelus, Quad, Ridgestreet Audio, Ref 3A, Magnaplanar, to name a few not already mentioned.

If it were me, and there were no price or room constraints, I'd be looking at both Classic Audio Reproduction speakers with the field coil drivers (recommended on many occasions here by Ralph/Atmasphere) or a perhaps a pair of Avantgarde or similar but more custom designed horns. The best I have heard were a pair of custom GOTO horns at last years Capital Audiofest. These running off some very nice Audio Note tube amps were very fine indeed!

Audio Note speakers (some of the less expensive versions) would likely get an audition with me though I have not heard these yet.

Were I more financially challenged, I would definitely take a look at a pair of the better Audiokinesis speakers, like teh Jazz Modules.

I have heard the PSB Synchrony speakers do very well off of other similar qualty higher power tube amps, like Rogue, so those are another I would consider on a budget.

I am also a fan of the better Triangle speakers. These might be one of the better quality more budget friendly speakers I can think of that are quite tube friendly as well.

Of course, Zu's are popular these days as well. I would be interested in auditioning those.