I'm currently using my iMac to listen to audio files via Schiit Bifrost/Valhalla + Sennheiser HD650 combo, sourcing audio from iMac's optical spdif minijack.
Now I'm all into upgrading my system to WA7 + Audeze LCD3, however I noticed that WA7 doesnt have optical SPDIF input, only coaxial RCA and USB. So I'm virtually left with two options: USB connection, which usually is considered to degrade signal comparing to "clean" optical/coaxial, or TOSLINK-to-RCA adapter, which I suspect also may degrade signal quality. After investing so much money in top quality headphones and amp/dac I dont really want to loose even slighter bit of quality on connection.
So, what are your suggestions in this situation? Apple iMac + WA7 + Audeze LCD3 look like nice combo for me, and should be popular set up, please share your experience. Thanks!