Anyone know how I can find out if my stereo is compatible? Is it just a matching connection type or something? This is the system I have. It's a few years old.
On the Airport Express is a 3mm mini jack, much like a headphone socket on an iPod. Different kind of signal to an iPod's headphone jack, but that's not important.
On 95% of stereos you'll have RCA sockets for line-in so what you need is probably is something like this: