looking for a more efficient speaker.....

OP,

Thanks for sharing your system. After giving it a little thought. The speakers are the most important choice in your system and largely determine the sound quality of a well balanced system (that is cost effective). Typically the speakers are the first choice and then all the supporting electronics are chosen. I recommend this approach.

Do you speakers sound ideal? If so, swap our your electronics to get the best sound out of them. They are pretty old. Perhaps auditioning speakers makes more sense. You want to find speakers that sound right to you… that you have an emotional connection to. Then, if necessary, swap out the electronics to get the perfect sound out of them. This is the shortest route to having a system that perfectly reflects your sonic values.

I would spend time auditioning speakers, until you find some that really connect with your emotional center. If tears come to your eyes… buy them… then optimize your electronics.

@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