I finally picked up the speakers and amps, and set it up last night.
Unfortunately, I seem to have an issue with the PS5 and the x3700h.
The screen keeps flickering black, and from reading up, it seems to be a PS5 VRR / 4k/120hz problem.
If I connect the PS5 to the TV and run eARC to the amp, no problems. If I connect the PS5 to the amp, I get this problem.
I thought this issue was fixed if the amp was made after May 2021, with a SN lower than 70001. Mine is in the 90000 range, so do I have a faulty unit?
EDIT: I have tried changing cables, updating the firmware on the amp, and updating the PS5. Also tried restarting both machines from cold (i.e. unplugged from wall, then replug before turning on).