I know dacs are digital to analog converters, so with a ps3 and only hdmi connection, what specs should i look for in a receiver? I was looking into some older model nad's or possibly arcam , b&k. However, those older ones are fiber optic only. Will those sound better than lets say, hdmi connection to a pioneer 1018 as i have now, listening to dolby truhd on bluray? any advice is appreciated. thank you