You've probably done your research already, but it's an 11 year old model DVD player. Oppo is known to have excellent on board DA converting. Most all of their players have a "+" and "--" on the remote for controlling the RCA output volume. Very handy if you use remote-less vintage gear.
Here is info from Oppo, with a link to the user manual:
https://www.oppodigital.com/support/dv980h/dv980h_support.aspx