looking for a more efficient speaker.....

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!

soix  also i talked with dr lee at acoustic zenn, ask if there could be a problem with the wow II's since i got rid of the tara labs for the same reason.  he told me not to tighten the interconnects to tight this will alter the headroom and clarity and he was right, just fyi.......

That’s very interesting, especially as I too have AZ interconnects/cables and probably over-tightening myself.  Is this a recent issue or has it been present the whole time you’ve had this setup?  Only other thought I have is swapping tubes in your preamp.  Best of luck, and please keep us posted.