Higher Efficiency Speakers


I am going to start my quest for speakers. My room is 13.5x13.5 but open on two sides... so not an ideal space. But never the less this is what I have to deal with.  I have a set of Vandersteen 2ce Sig ii but would like to upgrade. Was thinking about something horn. But seems when you go that route it gets way out of my price range.  Thought maybe look around for some Used Vandersteen Quattro CT but budget starts to stretch at that point. Like to stay under $10,000. What would be good speakers to look for to demo? If my room was alittle bigger.  I’d almost go the other way, and look at Small Maggie’s and Monostrap my amps.
System
Atma-sphere M60
Atma-sphere UV-1 ( Probably the most Modded. Will be at the end of the month. Lol) 
Bel Canto Dac

128x128Ag insider logo xs@2xpstores
Terrific.  Absent noise issues, the M-60 is a great amp for almost any reasonable loudspeaker.  I was just concerned about the OP's situation because of his plans to utilize high efficiency speakers.  


Those Salk 3’s are beautiful, but also 88db - not the most efficient.

Don’t lose sight of Decware, either:
http://www.decware.com/newsite/HR1.html
Unless the speakers are up against the wall and your seating against the opposite wall (not ideal, both your seating and the speakers should be at least 2ft off the walls, use a sofa table or something to take up space if you want). 
 
Ideally wattage should double with the halting of impedance, so even though your amp is 60W into 8ohm, it is 45W into 4ohm (unless this is a typo), meaning if you use a 4ohm speaker, you are efficiently feeing it <25W if it were an 8ohm speaker. 
 
At 10ft away and wanting 100dB peaks, you would need 91dB or higher efficency. 
 
The Noesis 215RT would be excellent at <$7500 shipped, not sure if the looks are for you though. 
 
Salk also custom makes speakers, so you could go that route, it would just take a long time as they would have to find the suitable drivers, test that it would work well, fine tune it, etc.
Klipsch Heresy IIIs...a steal at around 1500 bucks new (look around), not sure anything comes close...built like a tank, unique slanted fat little things that sound beautiful, and 99db efficiency works with anything.
Owning a pair of Salk Song 3 BeAT's that are driven by a Primaluna Dialogue HP integrated,  in a similar sized room, I can attest they sound marvelous and are plenty efficient.

However, pstores specifically was looking at horns below 10k being driven by a less powerful tube amp. That is why I suggested the Spatial X2, however they are not true horn with the AMT driver, but these open baffle speakers are and within budget

Pure Audio Project Trio 15 Horn 1
$8k
96 db 

https://www.pureaudioproject.com/trio15-horn-open-baffle-speakers/