@tcotruvo There is no issue with using RCA splitters to go to both your active speakers and subs.
There are many DACs that will be better than the one inside of the Node 3. It you’re not planning to invest thousands, you should just look into Node mods like the linear power supply upgrade and others that will improve the sound of the Node 3 itself. If you are planning to invest thousands, you may as well spend double and move on from the Node 3 on a dedicated streamer as it will bring even more clarity into the delivery. Of course, you can always get a good DAC first and upgrade to a better streamer down the road.