I heard from former Ivy owner that the KRELL MRA was the only amp that properly drove his Ivy in his large (approx 60-70) sq/m room. That said, the pass labs xa 200.5 wasn't enough. In a smaller room, same Ivy sounded adequately powered by pass labs xs 300.
You should try gryphon mephisto stereo or solo. My friend is driving his ivy signature with Gryphon amp. Started with gryohon stereo, follow by gryphon mephisto solo within 6 months & now biamping with mephisto solo & mephisto stereo. I m using gryphon mephisto stereo with Savoy signature . Superb
I used to own the much smaller Eggleston Rosa. I always had Pass Class A amps. Eggleston and Pass used to demo together in Audio Shows. I found that more power was always better with the Rosa. You could try contacting Eggleston directly or the guys at Pass.
Boulder / Halcro are great SS amps .
That is a big sound speaker by the way although i never heard one
6 12 inchers per side
The min imp is quite high 5 ohms and a reasonable eff, a powerfull tube might work also
What i found on their site :
Frequency response is from -4dB @ 13 Hz to well beyond 24,000 Hz.
Efficiency is 88dB.
Impedance is 7 Ohms, nominal.
Minimum impedance is 5 Ohms.
Tweeter: 1″ cloth dome.
Mid-bass: Twelve 6″ double-magnet driver, with a 3″ voice coil diameter.
Bass: Six 12” woofers loaded in parallel chambers in pressure driven configuration.