How important is the efficiency of a speaker to you?

It is extremely important to acquire a speaker that has a good synergy with the amp that powers it.

Tube gear is likely to be noisier than ss gear

@daveyf agreed. However, one can get the speaker first then get the matching amp subsequently - this has been my current strategy.

I have 2 speaker types.

Efficiency doesn’t matter - I purchased a full range herculean braced full range medium sensitivity speaker from a AXPONA demo that "resonated" with me. For this audio chain, I’m interested in transparency and dropping the noise floor.  I use highly regarded SS electronics

Efficiency matters - I wanted a "neutral", affordable, reasonable sized, speaker that can handle flea watt amps and other low powered tube amps. Purchased a 100db speaker specifically to explore tube amps including flea watt. I didn’t think much about synergy as I plan to experiment hearing different tube amps starting with the 300B, and the manufacturer confirmed I can also try a 45 tube amp.

Good luck with your speaker search

@kennyc The only thing that I think also needs to be added, or considered, when one goes and just buys a speaker that is requiring a monster amp upstream, is this…. That particular amp will most likely ( I can think of maybe one tube amp that might work, and it too is very expensive) be a very expensive ss high powered amp.The problem is that many of these very inefficient speaker designs, which can sound excellent, are also typically very pricey by themselves. So, not only is one now digging deep to just buy the speaker, but also one has to consider the potential for in many cases doubling the cost to acquire the amp,unless of course we are talking about Parasound’s…@rauliruegas

@atmasphere 

Im going to depart with your thinking when you say things like

"There are attempts to get around the thermal compression problem with lower efficiency speakers, such as vented pole pieces and the like. The incentive is high because lower efficiency speakers are a lot cheaper to make."

This is simply not true.  As mentioned before and elsewhere, lower efficiency drivers may sacrifice some efficiency to gain other features that improve performance such as lower distortion, better linearity, better low frequency extension etc.   The idea that lower efficiency is always done as a cost saving excercise is clearly not true.   

Brad

@lonemountain You are inferring something I did not say with this statement:   

The idea that lower efficiency is always done as a cost saving excercise is clearly not true.   

I don't need to repeat myself here. But it may interest you to know that high efficiency drivers, in particular woofers can be 10x more expensive than drivers of similar bandwidth and power handling that are not efficient. As an example the TAD 1602s (15", 97dB, Fs 22Hz) are typically $4000.00 each. Put a field coil into the mix and the driver gets even more expensive.

What I said when you quoted me is correct.

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.