I have a SA-DX940 5.1 Channel Technics receiver. I've got to m10 Polk book shelf speakers and a match 100W polk powered sub. I also have said reciever hooked up to my PC via SPDIF. My optical cable is hooked up to the computer it's self, so even though it's SPDIF it's still on board audio.
I'm wondering if I should invest in an external DAC, would this further improve my home audio?