High efficiency speakers vs Low, pros and cons


I've got a pair of Von Schweikert DB-100's ordered and they will be arriving soon. They are 100db efficient.

What is the purpose of high efficiency speakers other than being driven by low powered amps like SET's? Do they possess something that lower efficiency speakers do not have? They seem to point out any deficiencies in ones system. Does that make them "better" if your system is matched really well?

Just a few questions. Thanks.
richardmr
Roy aka gma@pcisys.net: Thanks for your contribution regarding speaker design and the way that you worded it. It was very well put and easy to understand. I'm glad that you have the ability to speak in terms that the average audio enthusiast can follow along with. Your post was a great contribution as far as i'm concerned. Then again, it agreed with what i've been trying to say, so it's no wonder that i like it : ) Sean
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Thanks guys. I'm glad you learned from them and that my writing wasn't too confusing.
Best regards,
Roy
Many good points here gents!

I do not agree that all amplifiers sound "the same" at one Watt. However, most amps will operate in Class A at low output, and definitely sound their best there - it may well be that they sound less different at one Watt.

I would add that the laws of physics define a relationship between low bass limit, efficiency, and box volume. So for a bass woofer, the designer who wishes to increase efficiency must either compromise bandwidth (low frequency limit) or make the box bigger.

Cheers,
CRP
What about those Frogs? They listen to single source, high efficiency designs with mono SETs....call me a buzzkill...but I actually like separation, panning, ect....