Radial Engineering Catapult TX4 Cat5 Audio Receiver (4x4 XLR In/Out)TX4: Transmit with 4 XLR ins & 4 XLR outs. The Radial Catapult is a 4 channel audio snake that lets you send analog or AES digital audio signals over standard Cat 5 or Cat 6 shielded twisted pair cable. This allows stage techs to take advantage of the relatively low cost of this abundantly available cable for return snakes or for transporting balanced audio across a large stage. For the system contractor, the Catapult lets you take advantage of pre