I have a CD 5500 which is not reading CDs. Apparently B&O do not carry the requisite spares. I have not been able to source a pre-owned unit but have found a CD 6500 model. I have a Beolink system, a 5500 Master Control panel plus BeoLink 1000 hand helds. Does anyone know what compatibility issues I my face if I linked in the CD 6500? Thanks David