Can I hook up my speaker system to both computer and stereo?
OK, the simple way: get a mini-jack splitter to take 2 ins and connect the 2 sources direct – get an RCA to mini-jack cord and run it from your auxillary output on the back of your stereo to your new speakers. There’s probably better and more sophisticated ways of doing it – but you need to tell us things like where your stereo is compared to your speaker system, what sort of outputs exist on you stereo, etc.