Best Efficient versatile Speaker reaching 30Hz?

Audio Note speakers will do that.
The An-E is 95db effiend and goes from 18hz-23khz at ± 3db. Although they
say on thier website -6db which is just another way of saying it.

http://www.audionote.co.uk/speakers/speakers/speakers_an-e.htm

Cheers,
Nick

There is a Von Scheikert (sp?) model called the DB93? (I am really butchering this name here) that is very efficient and goes pretty low. It has a built in powered woofer section............ Any it looks very interesting. Maybe someone else can chime in on this with a bit more (accurate) info.

Chris

The Wilson Alexandria.

Nominal Impedance: 8 ohms
Woofer: One 15 inch - One 13 inch
Midrange: Two 7 inch (vented enclosures)
Tweeter: Ambience: One 3/4 inch Supertweeter
Tweeter: One Inverted Titanium Dome

95 Db @ 1 watt. Down to 18 Hz. Good luck with coming up with the coin for a pair. Pretty amazing that they are that efficent with the drivers they have.

Burton

I believe Soliloquy 6.3i and 6.5is would both fit the bill and not break the bank. Unfortunately I don't know the status of the company, but there are usually a few used ones at reasonable prices. I have their 5.3's that don't quite make your cut, but are outstanding speakers by any account and offer great bang for the buck. Underwood Wally sells them new and B-stock at reasonable prices and is an excellent dealer.

BTW, I don't think I'd agree that "efficiency is the key" when it comes to speakers. Perhaps you are not stating this well. I've certainly heard ineficcient speakers that sounded great, and efficient speakers that sounded bad within specific respective systems. I think "synergy" would be a better word. With that in mind it may be good to be more specific about what you'd be pairing these off with and what exactly are you after that you don't have now.

Marco