Hi all, I have a pair of Audio Technica ATH-A900s (Audio-Technica - Products - Other - Discontinued - ATH-A900), that have a 40ohm impedance. I use them quite a lot for early morning TV viewing from a Sky box and a new Xbox One, both of which have optical outputs. Currently they are running into an old Pioneer receiver which has 2 optical in's that I can switch between, but I'm not sure the headphone socket on that receiver is a decent signal for my cans - the sound doesn't seem to reflect the quality of the phones. Regardless though, its a massive overkill for what I need! So I'm looking for a small unit to sit under the TV, ideally USB powered (in use, and not just for charging), and take an optical signal, and give me a decent headphone amplification too. (I don't mind if I only have 1 optical input, as eventually the Sky box will run through the Xbox One, so I'll only need the one). I'm slightly confused about the DAC side of things - I'm assuming I do need one, since the optical is a digital signal? I'd really appreciate some suggestions for suitable units around the 100 quid mark. Cheers all, and hello again!