Check out Coincident Speakers I think they are 94 db but Ive heard them on a set amp and they sounded excellent.
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I picked up a pair of used Klipsch RB-75's last summer and I could not be more pleased. Real wood veneer, 1.75 inch horn titanium compression tweeter, 8 inch woofer. Very efficient at 97dB and spec'd at 42Hz extension at -3dB. I am driving my pair with a Yamaha A-S1000(90w/ch) integrated amp but have heard others that have experienced great results with low wattage tube amps. Expect prices to range from around 500.00 to $600.00 on the used market. These 20 inch tall 32 LBS "bookshelf" speakers scream with volume but excel also with delicate musical pieces.
"... very easy to drive due to lack of complex xover."
Actually it is the impedance curve (both phase and magnitude) that the amplifier sees and interacts with; the amplifier has no idea how "complex" the crossover is, nor does it care. Intuitively we would think that a complex-looking crossover presents a more difficult load than a simple-looking one, but we really don't know without seeing the impedance curves.
Duke, as usual, is correct. Crossovers in fact will (almost always) make a pairing of drivers easier to drive than they would be without crossover induced transfer functions. And crossover 'losses' are another often perpetuated myth, .05-.1db loss is irrelevant.
Hoffmans Iron Law is always in effect, it's a Law afterall. Unfortunately many manufacturers take liberties with their claimed sensitivity and bass extension specifications. Not to pick on the Ref 3a which is a nice speaker, but just to illustrate that point - and that Hoffmans is unbreakable - this link shows how a claimed 93db sensitive speakers is in fact only 86.7db sensitive.