some info about the Changer-
CDX-646 10 Disk Changer is compatible to all Sony Head Units with shuttle control. Its 1-Bit D/A converter virtually eliminates the audio signal distortion created at the time of digital-analog conversion. The 8 times over sampling digital converter function uses an 8 second memory buffer to practically eliminate CD errors. CD Text feature allows the head unit to display additional text information stored in the CD software.This shuttle is able to playback CD-RW disks.This unit is no different in that respect to a Pioneer or JVC in the sense that all you really need to do is have a compatible h/u and simply run the wires discreetly.