looking for a more efficient speaker.....

@kennesawjet

I had a similar experience: Decades ago I had Genesis Vs, designed by Arnie Nudell, which combined a triangular shaped head (open baffle midrange + front and back circular ribbon tweeters) below were externally powered woofers. I went through many highly regarded amps trying to get a happy marriage. Nothing made magic until I bought a Kinergetics KBA 75 (Class A) only then did they come to life. You might check with the factory, or ask on the boards, or here specifically what amp works best with...

hth

spendor d line

Living Voice IBX or the upgraded OBX lines.  94dB...

Speakers are like car motors, the start working there best when they start making power and speakers work better when they hit 90db are louder. Most high sensitivity speakers give up a performance at low levels and the bass performance is not great.  I have own JBL’s and Klipsch and would never go back. These types of speakers were designed to be loud speaker, for theaters where you need volume  . Back in the 60s and 70s they were the best. Good luck

@jew16384 

What are you talking about? A light weight vehicle with a big horsepower motor will blow the doors off a heavy vehicle with the same motor.

I have Emerald Physics 3.4s Open Baffle @ ~ 99dB. No flea amp here. My amp is a LSA Voyager 350 GaN amp (500w+ at 4ohms): they are very happy together!