hi i have ripped all my cd's to windows media player via they're lossless codec, currently running it out of my laptop via 3.5mm jack in to sony amp f4403 (its old !) and some ancient castle standmount castle speakers (they're huge not sure of model) i believe from what i have read , that a dac would be of great use to such a system. i cant stretch very far financially and i need a usb dac for my laptop - all the cheap ones seem to be optical or coax. however i have seen this http://www.maplin.co.uk/productsearch?criteria=Digital-to-Analogue%20Audio%20Convertor at maplin and wonder if it might be a worthwile improvement. has anyone used one in a hifi ? all the reviews are positive, but they are mainly by people using it to connect tv's to a 2 channel stereo.