I think amps sound better in their their optimum power range instead of a very powerful amp barely putting out even a small fraction of its power...learned that decades ago from guitar amps. I like an efficient speaker with an amp that's digging in a little, like my Heresy IIIs and one of two amps I use with them: A Dennis Had Firebottle SEP or a Pass XA-25. Works for me. It seems that a very high percentage of speakers are in the 89 or less DB range requiring at least my Had amp to stay away except at low levels. A shame. Give me some clear horns over any "conventional drivers in a box," except for nearfield recording monitors.
How important is the efficiency of a speaker to you?
I went to an audio meeting recently and heard a couple of good sounding speakers. These speakers were not inexpensive and were well built. Problem is that they also require a very large ss amp upstream to drive them. Something that can push a lot of current, which pretty much rules out most low-mid ( maybe even high) powered tube amps. When I mentioned this to the person doing the demo, i was basically belittled, as he felt that the efficiency of a speaker is pretty much irrelevant ( well he would, as he is trying to sell these speakers). The speaker line is fairly well known to drop down to a very low impedance level in the bass regions. This requires an amp that is going to be $$$, as it has to not be bothered by the lowest impedances.
Personally, if I cannot make a speaker work with most tube amps on the market, or am forced to dig deeply into the pocketbook to own a huge ss amp upstream, this is a MAJOR negative to me with regards to the speaker in question ( whichever speaker that may be). So much so, that I will not entertain this design, regardless of SQ.
Your thoughts?