Speakers for a Large Room (20’x37’)

To answer a couple of questions, my ceiling is 10', and I listen mostly at low to moderate volume levels.  The need for a speaker that plays really loudly is low priority.  
@islandmandan You say your Tannoys are custom but I wonder if you could equate them to the Ardens,or perhaps a larger model.

@yyzsantabarbara  Thanks for the pointer to the Yamaha NS5000.  I'll do some research.

My main space is 45x25x16 broken up into LR, kitchen, and DR. My Zu Def 4 speakers are on the short wall and effortlessly fill the space using only a 300b SET. In my experience a high efficiency speaker is desirable in a huge space. 

Yamaha NS5000 for a home demo:

Yamaha - NS-5000 3-Way Bookshelf Speakers with Stands (musicdirect.com)

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Flagship Hi-Fi 5000 Series - Yamaha USA

NS-5000 - Overview - Speakers - Audio & Visual - Products - Yamaha - United States

I'm sorry @danager  but I missed seeing which speakers you were referring to.

@fiesta75 Thanks for the reference to the JBL Everest.  Lots os folks thought it was the bestof show at the recent CAF.

Sorry I meant to say:

Klipsch / Speaker Lab Corner Horns. They are a fantastic deal used. I live near Seattle and there are usually a pair or two for sale every month or so. The Speaker Lab SK versions are even cheaper. Volti and some others have upgrades for them. New horn and drivers and crossovers which is what I planned to do with mine when I purchased them but they sounded so good that I just wrapped the midrange horn with dynamat and enjoy them. For me the most amazing part is how good they in the kitchen. They fill the whole level with great sound