Oppo here too (BDP-95). I've never measured it but I assume you're asking about operational / fan noise. Once in a while, usually between songs, I can hear some fan noise. The music masks any other noise I might hear. I only hear slight spinning noise on startup and stop, not while the disk is spinning. Honestly, in my listening position there is enough other ambient noise (a/c, 4 dogs, wife tapping on her phone or computer, birds outside, etc. that any operational noise is almost mute. I turn the volume up.
These observations are in my seated position. If you're right on top of the unit, especially without music playing, the fan noise is more noticeable (when running).
I do play a lot of digital files through the Oppo as well from a solid state drive. The same comments apply except there is an addition click, like the sound of a relay, between every song, during the silence. I don't know what this is or why it does it. This sound is from the player, not through the speakers. I've been curious if anyone else experiences this.
