The Airport Express or an Apple TV device do just what you're describing, as long as you're using iTunes to manage your music files on either a PC or a Mac. You can use up to three Airport Express devices at once. I've got one in my living room and one in my basement taking a wireless signal from the Mac in my office.
The port on the Airport Express or the Apple TV outputs a digital signal through a mini-Toslink connection, which goes into a Toslink input on your DAC, assuming you have one. An analog signal is available from the same port by using a mini-stereo plug but the quality won't be as good as using the digital signal through a decent DAC.
The retail is $99 for either box and the Airport Express is usually available refurbished from the Apple Store for $69. If you don't need the wireless router functionality of the Airport Express the Apple TV is probably a better deal since it does all kinds of other cool stuff, as well.
The port on the Airport Express or the Apple TV outputs a digital signal through a mini-Toslink connection, which goes into a Toslink input on your DAC, assuming you have one. An analog signal is available from the same port by using a mini-stereo plug but the quality won't be as good as using the digital signal through a decent DAC.
The retail is $99 for either box and the Airport Express is usually available refurbished from the Apple Store for $69. If you don't need the wireless router functionality of the Airport Express the Apple TV is probably a better deal since it does all kinds of other cool stuff, as well.