Easy to drive, outstandingly natural sound from 40-50 Hz up.....AN-E, O/96, others?

Big Tannoy - the legacy arden do 35hz - 30kHz and an easy 93db driving speaker.
But O93 should be cheaper and easier to pick up in the US (tannoys in UK relatively cheaper $7000 new for the Ardens) and I would have prob been keen on them and Audionote AN’s as alternative.
Think all 3 are ones to lose yourself in music with.

Take a serious look into the Spatial Audio speakers. Their entry models have a coaxial compression driver (midwoofer functions as horn like Tannoys) with 93db sensitivity. Zero horn "honk." The nominal impedance of their Triode Master M3s/M4s is 12ohms.

I’ve heard some of the other speakers mentioned here, including the ANs and Spendors, and the performance of even the entry-level Spatials is on par. I was almost deterred by their pro-driver compliment but one must keep in mind they are custom spec’d by Spatial, not off-the-shelf units. They can produce high SPLs with just a few watts but are robust enough to power an auditorium. 

I’m very particular about tonal balance, hence my being a fan of Spendor Classics. The Spatials produce a nearly identical midrange (a little better honestly), a bit more sparkle on the top end and superior decay. Never fatiguing. The bass is incredibly defined and better than anything else I’ve had in house. I have their smallest model in a rather large room and the bass impact/slam is still very good. Best thing about them is you can get all this performance for 1/2 the price of comparable ANs or Spendors. 60 day in-home trial.

Mitch, a few things. Looking at your systems page ( very nice ) the Khorns would be too far apart from one another. The Lascalas would be my choice ( why I have the Lascalas as well ). Yes, I had a side business, and started damping horns ( and other areas of speakers / equipment ) 50 years ago. My ears recognized the " ringing " and resonances that was very apparent, and I used products such as mortite, clay, and then as time went on, Dynamat, and self adhesive roofing repair tapes, such as Peel and Seal and U Seal, available at Lowes and HD. Significant improvements in sq. I did not stop at horns, as I do the driver baskets of woofers, the magnet assemblies, and in the case of mid horns that are held with brackets at the rear of the horn, to the cabinets ( such as the Khorn and Lascala, as there are others ), these areas as well, as they vibrate and resonate with higher volume. I am a Klipsch Heritage fanboy, as I find the 5 original Heritage models designed by the one and only PWK himself, to be the best at their respective price points, yesterday, and still today. Many others feel the same, many others do not. I was in the audio business, in NY, for over 40 years, sold at stores, was a rep and did consulting. I owned a lot, and heard just about everything. I do not claim to have the best ears, nor be the most knowledgeable in sound system set up. Admittedly, there are many speakers that do some things very well. What I do want to say is, I discovered, a long time ago, a reproduction of musical playback, that has stood MY test of time, and has "easily " satisfied my listening desires, and pleasures, with every type of music available, compared to others. With tubes and solid state, with low power and high power, with analog and with digital, with music and movie soundtracks, it is here. Klipsch, as a company, keeps " the mans " dreams and designs going, after he is gone, and they are still selling, here and abroad. You are welcome to pm me, or keep this as an open discussion. Enjoy ! MrD.

I assume I came on too strong....guns ablazin…..

too strong?  Nah, just too busy here.
I wish I would have tried this stuff years ago.  It is tough to switch directions now that I have my speaker system pretty well dialed in for great sound, but they are inefficient and need lots of power to sound their best.  
There is a 50 watt amp I would like to try but it wouldn't stand a chance with my speakers.  The amps I have are 90+ percent of the way to nirvana but just falling short in one area.  Since I already own the speakers, trying different amps until I find something better may still be the easiest direction for me.  Problem is, I have tried several pretty good amps and the amps I own now are better than all of the others I have tried, and I don't want to spend a fortune trying high powered amps.  One recent change I made is to try going DAC-direct, first with the Metrum Jade I recently purchased for a second system and then just this week with Metrum's flagship Adagio I purchased after hearing the Jade.  The Adagio has been warming up for a couple of days and I will get to listen to my system without my preamp this weekend.

I was hoping to see some recommendations in this thread for relatively high sensitivity speakers (like 95dB +) that can be driven hard with 50 wpc and that display tonal density, strong dynamics, and a natural sound without added edginess, shrillness, honking, or other issues sometimes reported with horns and other really high efficiency speakers.  I think there are a few of those types of speakers mentioned here that would be worth hearing, but I am not convinced Klipsch speakers meet all of those goals....although there is an interesting pair of Belle Klipsch speakers that were recently listed for sale.  I need to go to show where I can hear some different high efficiency speakers.