Hi Ninja, thanks for the assistance. So if I go optical to the Q5, it picks up automatically without me having to change any settings in the PS4? That sounds simple enough, and I'll give it a shot tonight thanks.
P.S, the intention isn't to use the Sony golds, so no need to worry about that. I just needed a way to connect my Audeze headphones (sines or LCD's) without plugging then straight into the controller port as I'm not getting sufficient power to drive them properly when doing that. With the optical route, I can use the balanced out on the Fiio to get the power I need.
Thanks again, much appreciated