Novice question - DAC on receiver/transport
Not that my aging ears will here the difference - BUT:
Had an old 5-cd Sony Changer with RCA/component out.
Recently stumbled into a champion $2 bargain - (Sony DVP-S7700, broken DVD - but CD transport just fine; sitting on a shelf in the dying days of Tweeter) - and simply hooked it up with the RCA jacks.
It occurs to me now (in the dying days of Circuit City) that I should pick up a cheap digital coax cable instead of using the RCA audio jacks.
My receiver is a nice - but older - HT receiver Onkyo Integra (DTR 7.1).
So I guess my questions are:
1) If I leave RCA connections, DAC on the receiver is used, correct?
2) If I use Digital Coax, how do I know which DAC is used? Is there a way to determine if it's the Sony CD/DVD DAC or the Integra DAC?
3) If I can select between the two, should I be using the Sony one or the Onkyo Integra one?
Sorry for simple nature of question.