See also:

• Recreation: Audio  (193)
• Shopping: Consumer Electronics: Communications: Wireless: Radios: Digital  (19)

• Ambisonic.net - An alternative method of surround sound encoding, with technical articles, discography of ambisonic recordings, equipment listing, FAQ, and the Sursound mailing list.
• TalkBackwards.com - Upload a song or voice recording and hear it played backwards online to see if it contains any hidden messages, or just for the fun of it.