Several manufacturers, including RCA and X10, offer wireless audio devices that can transmit a stereo audio signal up to 300 feet. These devices use either the 900-MHz or 2.4-GHz spectrums, which are also used by cordless phones and wireless video cameras.
Most wireless audio transmitters include dual RCA jacks that can be connected to a sound card’s line-out jack with a splitter cable. Most wireless audio receivers have dual RCA jacks that can be connected to a stereo receiver with a standard RCA interconnect cable (male-to-male RCA).
Some wireless audio devices are capable of delivering good sound quality, but interference from portable phones and other electrical devices can be a problem in heavily populated areas. Moreover, devices that use the 2.4-GHz spectrum can interfere with many wireless networks.
Wireless audio transmitters can be purchased for under $100, but you are much better off spending a little more for a wireless digital media receiver (more on that in a moment). These devices use standard wireless network protocols and can transmit higher-quality sound than wireless audio systems (Figure 3-7). A wireless connection between your computer and stereo system gives you the flexibility to transmit music from your computer to multiple rooms. Digital media receivers that use "wi-fi” network protocols provide the best quality sound and the most flexibility.
Figure 3-7. Wireless audio
Devices that use the 2.4-GHz spectrum can cause interference with ...