high-efficiency loudspeakers

If there is a 'best'... I look at what would be on the short list.

Another vote for Classic Audio Loudspeakers. 98 db 1 watt/1 meter, 16 ohms, 20Hz (honest) to 35Khz). Optional field-coil powered woofers and midrange; first breakup at 35KHz so very smooth and very fast.

Ralph is there an established price list for the "Classic Audio Loud speakers" ?

It depends on which model and which options. So they can be anywhere from $8000 and up. I've not seen an established price list- just give John a call.

@dodgealum , while the Deadalus is a very nice speaker (and easy to drive), its not really what I would call 'high efficiency' although they are at the high end of what seems to be 'moderate efficiency'. He specs 96db+ on his site, but that is a sensitivity rating, not efficiency. The sensitivity rating requires that you take the impedance of the speaker into account because the rating is based on voltage rather than power.

So for example, if the speaker is 96db and 6 ohms, its actual efficiency is around 94.5db. 97 or 98 db might be the bottom end of what is considered high efficiency, with many examples being over 100db.