Opinions on efficient bookshelf speakers 95db?

Devore

"... 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
dealer/manufacturer

Coincident Triumph Extreme II are worth a serious consideration.

Sonist- Concerto 2's get my vote.

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.

http://www.soundstagenetwork.com/index.php?option=com_content&view=article&id=1150:nrc-measurements-reference-3a-mm-de-capo-be&catid=77:loudspeaker-measurements&Itemid=153