Balanced audio circuits rejects common mode noise such as Hum etc, The quality of cable is not particularly critical, and it is possible to transmit an audio signal for many miles using ordinary unshielded telephone cable. Cabling used in Radio Stations and Recording Studios is of fairly ordinary quality without affecting the audio quality in any way. The last few feet between CD player and Power Amplifier should not matter at all unless something not related to the cable is seriously wrong.
