You were never really clear what exactly you were trying to accomplish.
The only off the shelf WiFi audio streaming (not media streaming) I know of is the Apple Airport Express which you can stream audio from an Apple device to the Optical/Analog 1/8" mini output of the Airport Express. This is true streaming audio from a device.
Other options are sending audio from a dedicated computer to another device over a custom interface such as the rWave from Arcam and other audio streaming.
The common option is media streaming and media servers with remote control. That's the most practical way to accomplish remote control of audio and other media. The media exists either on the playback device or a NAS solution and is read by the playback device which can then be output through just about any DAC you can imagine (USB will almost exclusively require an actual computer running OSX, Windows, or a Linux/Unix OS) remote control can be accomplished with Apps or dedicated RF/IR controllers.