I don't know.. my general rule these days is unless I'm trying to colour the sound in some way or add something like more stage width I try to avoid amping my IEMs. (with the exception of dedicated dac/amps). I have been pretty guilty in the past though using a stack with low impedance IEM.
Anyway, feels like we've flogged the A83 horse to living death by now lmao. Feels like it's been about 2 years. Mine are completed with thier groovy cable, I just use them with Cayin N6 atm. I'll give my unit points for hanging in there remaining function.
I'm on the hunt for a new IEM, about $1k or something. Maybe K3003, SE846, JH Angie with a few more hundred on top. If Fidue would just hurry up with an A83 successor it would make my life a lot bloody easier.