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I've been designing speakers with Ralph's smaller amps (S-30 and M-60) very much in mind for years, but my speakers tend to be bigger than average (though usually not "T-1.5 big"). I do horn speakers that hopefully don't sound like horns, well at least not in the negative ways that the word "horn" can bring to mind.
In a fairly compact speaker, you might consider High Emotion Audio and Omega Loudspeakers.
At what they do well the Quad 57s are just magnificent. If you decide to do a stacked pair, contact me for a tweak suggestion.
Best of luck in your quest,
I have had a number of people listen to my Jazz Modules. One in particular who is pretty well known in the audio world mentioned that they sounded better than the German and other exotic horns he has heard. If you do visit Duke and hear his speakers I'm pretty sure you'll drop that exotic requirement. I only sold my Jazz Modules because my bi-amped ESL 57 set up with multiple woofers in a "swarm" array (ala Duke) gave me the benefit of what the ESL 57 does best without the bass limitations and resonance issues of those speakers.
Thank you very much, Clio09. I don’t mind my Jazz Modules being replaced by Quad 57s + swarm! Very nice combination.
Dragon, thank you for having considered my speakers.
Cosmetically they certainly are not exotic, nor do they use any particularly exotic technology in the drivers, aside from optional Beryllium diaphragms for the compression drivers. I now have access to a master woodworker who has built T-7s for John Wolff, so I can offer excellent cabinetry on a custom basis, but he is not cheap.
Speaking of which, have you considered the T-7? Field coil motor, wizzerless fullrange cone, beautiful tonal qualities, and magnificent cabinetry.
I don’t know whether this would be "exotic", perhaps merely "unorthodox", but some of my models deliberately approximate the acoustic effects of being in a significantly larger room, which imo has psychoacoustic benefits.
If you are serious about hearing what I do, I would like to put you in touch with a colleague of mine who a) has more of my designs on hand than I do; b) has a much better audition set-up than I do; and c) has contributed ideas which have significantly improved my designs. I spoke with him just a few minutes ago and he'd enjoy it very much.
At the risk of stating the obvious, they should have a high, relatively flat impedence curve for the most part, although as others noted, they are reported to mate well with Quads. Also Soundlabs and Magnapans, IIRC. I have used them successfully with Merlins, Hornings, and now with a DIY pair of open baffles with field coil mid/tweet and conventional mid/low bass units. From personal experience, if you have the room, they are fantastic with the Classic Audio speakers, being able to reproduce live SPL rock music in a very large room with the M60s.. If you want to get an opinion about how they mate with a particular speaker, you should ping Ralph (Atmasphere screen name), if he doesn't show up here on his own. You will get an honest opinion with, IMO, no marketing hype.
I am well aware of the smaller inconvenience of owning OTL gear but in my honest opinion for this level of quality in enjoyment I am more then willing to compromise. Once the match of the speaker and amplifier is complete all you experience is pure magical bliss!
The T1.5 Classic Audio Loudspeakers are excellent and magical theirs nothing like it. Its just flows with music in a emotional way that sparks your deepest feelings so easily, I feel like I'm transported somewhere else.
The speakers are full field coil. These are a keeper I would never part with them. Mines are paired with the New Atma-Sphere Amplifiers "Nirvana". A Super Regulated OTL Amps LOL The best Atma has developed till date I guess.
The OTL amps have been a revelation. I was more in to SET and certain push pull class A design but never experience this form of lucid feeling from a sound system.
Its going to be hard to find a speaker that can perform like a Classic Audio Field coil but in a smaller and less expensive package and designed for smaller rooms.
I have been considering smaller horn speakers or Single wider-band drivers too. Just not settle down yet and need to go out and listen to some of the manufactures that are based in the EU.
My ultimate goal was to build a smaller system with another set of Atma-sphere gears this time with the MP-3/MA60. Once you go OTL you cant go back :-) Everything else just sounds slower and less transparent. I cant seem to enjoy my previous gear (for second system) and thus had to sell some of them off.
Good suggestions here, thank you all.
I remember Ralph telling me he used Bud Fried's loudspeakers when he developed his amplifier, and I'm not sure there's a better match for either. The series crossovers and true transmission line couples magically with the OTL. Even after a couple of attempts at revival, sad to say the brand has faded into the vapor.
For what it's worth, though still owning several other speakers, including several Frieds, after hearing the Quad ESL57, which Bud brought to the USA, I've stopped thinking about loudspeakers. No other brings as much reality