I’m positive this is a less than smart question, but have not found the reason while researching… if the WiiM Pro will only be used for streaming Apple Music over Airplay 2 via Wi-Fi network AND the integrated amp (Emotiva BasX TA1) has Bluetooth, are output cables necessary? And if so - which would provide the best sound quality (Line Out RCAs), Coaxial, or Optical? Appreciate your time.