Driver efficiency vs. overall speaker efficiency

Pragmatist, if more current is drawn to achieve a higher sound level, the efficiency hasn't increased. Or am I making a mistake here? A higher efficiency means more output with teh same cuurent.

Satch...Efficiency is stated as dB per VOLT (not current). Of course the current will be more with a 4 ohm load, but that's the power amp's problem.

Satch:

I'm not an expert,so allow me to quote my source:

http://www.northcreekmusic.com

If you link through to the page that describes their rhythm speaker,in the fine print,it talks about an mtm set-up and its effects.(It's the paragraph labeled "Sensitivity and Impedance".)

No free lunch.

High-efficiency speakers-

Are they just going to give more sound-per watt, or will they also communiate more texture (micro-dynamics?) of the sound, along with the extra dB?