High efficiency speakers vs Low, pros and cons

You cannot separate the loudspeaker from the amplifier that drives it. There is nothing in either approach (low power/high efficiency vs. high power/low efficiency) that makes one inherently better. Outstanding musical performance can be achieved by both methods.

Please take this with a grain of salt, as these are gross generalizations. High efficiency speakers may be more suceptible to noise infiltration, may have greater impedance swings, and may have looser bass. I repeat, these are gross generalizations.

Speakers that are high efficiency ( 95 - 96 dB's and up ) tend to sound punchier aka "more dynamic". This is even truer for "ultra high efficiency" designs ( 100+ dB's ). Having said that, most of them also tend to be bandwidth limited and lack the ability to handle gobs of power / play at sustained high volume levels. They tend to use inexpensive low mass* drivers that break up and distort if pushed hard. As such, the benefits of high efficiency are only good if used at lower power levels. As Unsound said, these are pretty vague generalizations, but ones that i've come to realize via past experiences. There are exceptions to every rule though and more than one way to skin a cat. Sean
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* the more mass you have in a driver, the harder the motor must work to push it, hence a loss in efficiency.

I wouldnt worry too much about it...find a speaker u like...then mate with appropiate power...as much as people want to make it...this is not rocket science....I also agree there are no real advantages to hi-efficiency designs other than low power/tubes can be used...

Phasecorrect is right on!