Adept optical fiber since my first amp, I've never looked at the topic of digital coaxial. But with today's technology, I came back a little in order to exploit digital coaxial inputs of my amp. Okay, I'm not a sound engineer, but I make no difference between optical and coaxial connection (in acoustics).
The quality is present !!!
The PCM, Dolby Digital and DTS are transmitted without loss !!!
PS:
Just a tip, calculate the exact length of your cable !!!
A too long cable may be noisy unlike fiber optic ...