ZONE!
I'm having a similar problem. Best I can tell for you it wont make too much of a difference (for 2 channel listening that is). It depends on which component you want to do the DA conversion (which one has the better DACs). If you're curious, just goto circuit city and try the optical cable (disconnect the others). From what I understand (and I'm not 100% on this) COAX is better then optical (romyus). I think it has to do with the manner in which the signal is transferred. the optical changes the digital to another code with must be changed back. The coax remains unchanged during transfer so you sacrifice less. (I could be off on this). FYI, coax cables are orange and look like RCA jacks- the 3 you have connected now - you may not have one.)
I'm having a similar problem. Best I can tell for you it wont make too much of a difference (for 2 channel listening that is). It depends on which component you want to do the DA conversion (which one has the better DACs). If you're curious, just goto circuit city and try the optical cable (disconnect the others). From what I understand (and I'm not 100% on this) COAX is better then optical (romyus). I think it has to do with the manner in which the signal is transferred. the optical changes the digital to another code with must be changed back. The coax remains unchanged during transfer so you sacrifice less. (I could be off on this). FYI, coax cables are orange and look like RCA jacks- the 3 you have connected now - you may not have one.)