The Belari is fine for the high output Denon or the AT440 but not the low output of the moving coil AT.

An MC stage is for low output cartridges. A mm cartridge's higher output could cause the MC stage to overload and distort.

Running a cartridge through two stages would double the riaa equalization. I am sure that would sound terrible.

I once owned the AT and found it to be a thin sounding cartridge. I have read where it has more warmth since switching to an aluminum cantilever.