The Velodyne WiConnect System allows any subwoofer (and most powered speakers) to receive the audio input wirelessly. It has both a wi-fi transmitter and receiver for frequencies in the range of 6 Hz to 16 kHz at 3 dB down. This system also has 4 selectable channels that won't interfere with other wi-fi devices in your home and has a transmission range of 50' with a power on/connection indicator light.
Note: The WiConnect System has a very wide bandwidth (20 to 16 kHz ± 0.5 dB).
Thus, it can be used in some cases for full range signals as well.