How important is the efficiency of a speaker to you?

Efficiency is not important to me in that good quality full range efficient speakers are large and bulky. Large and bulky is the last thing I need. My goal has been to downsize. Otherwise, some of my favorite speakers sound wise are very large, very bulky, very expensive and very efficient. Think large horns for example. Wonderful stuff done right but not where I am going practically. There is a very practical reason why most speakers sold are smaller and correspondingly less efficient. They too can sound very good especially with modern advances in amplification and most people have limited room and don’t want to have to deal with large heavy and bulky speakers. Some do though and more power to them.

PS: Would love to have a pair of Klipshorns, at least in theory. 

@lonemountain +1.

More Efficient just means louder. Alone it has little to do with what amps will drive the speakers well ie produce the intended sound completely. That has more to do with how difficult a load which is more about impedance, not efficiency.

So really all more efficient means is a flea powered tube amp can make them go louder before clipping sets in. It does not mean one is getting all they can out of the speakers regardless of amp. That’s not to say the results will necessarily sound bad, just not optimal, and different with different amps, not the same

Take Fritz speakers as an example. If you check out the website you find these are designed to be an easy load for any amp but are not high efficiency. They will sound more similarly good off most any amp and still achieve decent SPL with most any amp, so they are an excellent choice for someone who wants to get best end results using most any amp. The site also shows how the Fritz speakers compare In this regard to other popular speakers. 

Class D amps are certainly a lower priced option, but most folks still are not that impressed with the SQ. 
 

Most folks not impressed?   Say what?