question about clarion

My co-worker has a nice older clarion cd player. His sub works fine when the cd player is on tuner mode but the sub cuts out completly when he plays a actual cd. i told him his cd player is prolly fried and old? but could it be something else?

prolly has the remote wire wired to the power antenna (most cd players shut off antenna power when switched to CD)

I have seen that pretty often, actually

ill ask him about that but im pretty sure hes had it wired the same way for atleast a year and all of a sudden the sub stopped working when he went to cd mode. any other ideas if this is the case?

then it would have to be something internal to the CD player