How important is the efficiency of a speaker to you?

Dear @phusis  and friends:  we have to remember that atmasphere is a tube electronics and from several " vintage " years his flag ship argument to hit class A and AB solid state amps always is that: harsness/brigthness " but with out real facts. His article is only bla bla bla as always in that regards.

If he can proves what is his solid state agenda then that comes here and shows at least 10 SS top/high power amps tha showed what he said in the last 10 years with measures of those amps and what the reviewers said it about. Here one example  and the other is my very old 20.6 monoblocks  where just does not happens his bla, bla, bla,:

Halcro dm58 monoblock power amplifier | Stereophile.com

R.

Loudspeaker power handling vs. Efficiency. Magnetic flux modulation compression see here.😎

Mike

In my experience low sensitivity speakers not just make unpleasant compression but also mask microdynamics and texture. It is so obvious that producing low sensitivity drivers is much cheaper. Weak magnets are cheaper, heavier diaphragms are cheaper, rubber suspension are cheaper. But you pay for marketing, and a beautiful box that was lacquered dozens of times.

Dear @alexberger  : Yes you are rigth and I can see your Altec Lansing drivers, that  EMT, the Tamura and the like. Congratulations.

R. 

Again: efficiency is just ONE aspect out of many that has to be addressed in high performance loudspeaker design.  High performance drive units are so much more complicated than "how loud they are", with so many more aspects to them than efficiency alone.  Would you judge a car's track performance on miles per gallon?   

For an alternative dicussion about drivers from a man who is highly respected everywhere in the world for driver design, try this.  Billy explains much better than I:

.ATCWhitepaper.pdf (transaudiogroup.com)  .   

Brad