DVD-Audio discs (different from regular DVD's) and SACD's must be output as analog, so for those you need the six analog cables. Regular DVD's and CD's are best off using the digital output, however, which is why I don't suggest investing in the extra six cables now unless you have or plan to get any discs in those two formats - especially since neither format is very healthy these days. You can get a three-pair set of PCA's from Outlaw (they're listed on the order form for this very purpose).