Here is an interesting and potentially helpful tool from iFi to help match headphones and amplifiers.

ifi-audio.com/home/headphone-calculator/

"What are your ‘go to’ headphones? Or are you hunting for your next special pair? With the exclusive iFi Headphone Calculator, you can check out whether our gear will drive them. And do the same for any other product on the market, whatever the brand."

Works for iFi products, plus any other amplifier you have the specs for, and a wide range of headphones.

😀 But it always seems to conclude that you need an iEMatch, which in a lot of cases isn’t necessarily the case.

AMR-iFi R&D

Tried the tool but couldn't find all the required info for two amps. Just continue to play it by ear I guess.