A:AnswerNo. Consumer speakers marketed as "digital" are not digital. They are analog. It is just marketing.
If you are interested in digital speakers, first read this.
https://en.wikipedia.org/wiki/Digital_speaker#:~:text=Digital%20speakers%20or%20Digital%20Sound,a%20form%20of%20loudspeaker%20technology.
A:AnswerAs long as the Onkyo has a 3.5mm output, it will, otherwise, you might need to get an adapter. The only input these speakers have is 3.5mm and they don't have a RCA to 3.5mm adapter.