PureFi Keep Alive
OS X background app to keep your Logitech Purefi Anywhere from going to sleep when plugged into your mac.
Just open the app and leave it running in the background. All it does is play a sound you can't hear (a 22 kHz tone) through the speakers for 1 second, every 60 seconds. That keeps the speakers from powering down to "save battery power", which they do even when running on AC...