Doing that won't hurt anything, and it will most likely function in a reasonable manner. I can envision a couple of ways, though, that there MIGHT be at least slight adverse effects on sound quality.
One issue might be an increase in ground loop-related noise currents flowing in the digital coax, which might affect jitter at the point in the DAC where digital is converted to analog.
Another issue might be "crosstalk" within the integrated amp between the two sets of signals it is receiving. That is, a little bit of one signal leaking onto the other, with timing differences between the two signals (resulting from differing delays in the two dac circuits) exacerbating the consequences.
Both of those possible effects are system dependent and essentially unpredictable, and could very well not be issues at all. But before proceeding with the comparison you want to make it might be a good idea to first do some comparisons that would allow you to assess those possibilities.
Also, keep in mind as you do these comparisons that since the DAC is new its performance may be changing over time due to breakin.
Regards,
-- Al
One issue might be an increase in ground loop-related noise currents flowing in the digital coax, which might affect jitter at the point in the DAC where digital is converted to analog.
Another issue might be "crosstalk" within the integrated amp between the two sets of signals it is receiving. That is, a little bit of one signal leaking onto the other, with timing differences between the two signals (resulting from differing delays in the two dac circuits) exacerbating the consequences.
Both of those possible effects are system dependent and essentially unpredictable, and could very well not be issues at all. But before proceeding with the comparison you want to make it might be a good idea to first do some comparisons that would allow you to assess those possibilities.
Also, keep in mind as you do these comparisons that since the DAC is new its performance may be changing over time due to breakin.
Regards,
-- Al