wireless subwoofer transmitter

who makes a good one, if there is such a thing?
Any wireless line level system will work. Here's one: http://www.outlawaudio.com/products/OAW3.html
This must be converted to digital for transmission. How come outlaw audio does not provide specs for the digital conversion?
I have the Velodyne , it works great
Some of the new RELs offer a bespoke wireless system...a great idea albeit one that adds cost to the speaker.