Good speakers less efficient?

I've noted that many of the better speakers are 4 Ohm and not very efficient. What high performance attribute causes this correlation?

raduray11-29-2006 12:04am

mrtennis Details Discussions Posts This discussion Message User 3,295 posts 11-29-2006 at 05:32pm Copy Comment URL Report Comment Edit Delete dipolar radiators have efficiencies in the 85 to 88db range. i happen to prefer this type of speaker. depending upon the room and the impedance curve, they can pose a challenge fot a tube amplifier. if one prefers this design to other designs... well, draw your own conclusion.