A Reference or of the highest standards ,many of us cannot afford.
you build your Reference Audio system as to the highest your budget will allow .
the speakers by far are usually the most expensive , I see the front end Dac on par as importance for this s where all music starts and it’s signal purity,
once compromised it cannot be made up for down stream ,,
andyes all cables especially digital can make a big difference in resolution .
you need 2 Quality Ethernet cables as well as usb , then a Quality Ethernet hub with a LPS power supply ,also your router very important if streaming
linear Tube Technologies excellent LPS for $700 betters anything even at $1k and up to 8 amp, this LPS can be ordered up to 19-20 volts 8 amps and needed on the router ,all new ones are normally 12v around 4 amp, same with power cords , and system cables look for connectors Copper ,NotBrass ,3x better conductor Thst much less resistance sounds much better.