Pitting my JBL L150A's against a beat, beat, beat set of Klipsch Cornwalls gave me a PhD in the Importance of Efficiency haha. I had upgraded to a Marantz 3600 pre amp & Marantz 510M power amp. But 300 watts RMS just wasn't enough to rattle my ear drums properly with the JBL's. but whoa damn, those Klipsch's loved every watt. They just didn't have the refinement, articulation or as deep & tight bass the L150A's gave me. When I got the Adcom GFA 555 II's and bridged them, whoa yea. They came alive with 600 watts alright. The "Cornholes" have been put in the garage, and I'll probably toss one of the GFA 555 II's out there to run them. Main system is currently evolving- going to try Crown Pro Audio stuff and see where that takes me..
But the Cornwalls were so enjoyable that I went on a Klipsch kick for a minute. Bought and tried Forte I's, II's and am still looking for Chorus II's.
You might consider adding a set of Heresy 1s to your list if you haven't experienced them already. IMO they're tighter and more responsive than the Cornwalls. Not much good below 50Hz so you'll need a separate sub if you like the low boom, but the mids and highs are incredible even with a minimal amp. I'm running them on an old Denon DRA-275R 40Wx2 receiver that I bought used on eBay years ago for $50 and the way they sound you would think they're getting five times that power.
I've actually never seen those Adcom GFA-555s before, those look really cool. I've been thinking of upgrading to a more powerful amp with a separate pre-amp, I may have to look into them further.
EDIT - If you do get some Heresys or you're looking to improve your Cornwalls, Crites Speakers makes/made some great crossovers. My original Heresy crossovers were in seemingly good shape visually so I wasn't expecting a big difference, boy I was wrong. It made such a difference that my dad bought a set for his Heresys he's had new since '71. I just checked the website and it appears that Bob Crites unfortunately has passed away, hopefully someone in the family carries on his business because he made some amazing products.
https://critesspeakers.com/
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