I have a old Pionner Elite VSX-45tx that I've been using to power my speakers, it has USB audio on it, and I've been using that. should I use a toslink cable instead or should I scrap the whole thing and get a real DAC? I'm using this because it free and my Dad had no use for it anymore. do PC 360's need a amp? I feel like my onboad sound can't play them as loud as I like.