Minimum sample rate is 48khz/24 bit.
I believe the max limit drops from 192khz/24bit when there are over a certain number of connections per a controller. I believe the EA5 drops to 96khz/24bit max when three outputs are used on it. Two outputs I believe stays at 192khz/24bit and you could keep it that high and have four outputs if you had two EA5s.
That being said, I think Qobuz, Tidal, and Amazon Music HD hardly ever go above 48khz/24bit.