That's clearer, Peter. Yes, that's what SPDIF stands for, but the reason that I questioned it was because I thought that you were thinking of using the Denon pre-outs, which are analog.
The basic premise here appears to be flawed: a digital connection doesn't necessarily help a hum problem. The digital 1s and 0s aren't themselves corrupted by the voltage at the hum frequency, but unless the entire connection is adequately shielded, the hum voltage will ride in and be amplified along with the real signals. If you use the same in-wall wiring which you believe is picking up hum, it'll continue to do so.
