If you truly want better sounding digital ,then go to little green computer to see options
never have separate modem,routers i bough5 the latest docsis 3.1 motorola 8702 combo much faster,more cohesive , and get rid of the crappy $10 power supply
$299 12v Zlinear power supply for starters , for sure helps streaming
then a converter hub from Ethernet to fiber optic to a Sonore Deluxe as your digital converter end point with has very low noise regulators and Femto clocks a good LPS there .I use the excellent Linear Tube Audio LPS ,it’s the best under $1200 I have found for $750 ,, a substantial upgrade in sound that goes to your server .and good quality Ethernet cables is important and very Audible.remove all weak links in the chain. Digital noise is jitter that can and does travel house to house if you hav3 coax cable coming into your house.