The RX400 Rack Mount ENG Receiver has been distcontinued and replaced by the RX-12R.
The RX4900 is a single rack unit containing four stereo receivers. It has the capability of receiving eight channels of audio while used with stereo transmitters. The RX4900 provides all necessary power and antenna distribution internally for each of its four receivers. The antenna inputs of the RX4900 have a complimentary loop output so multiple RX4900′s can be connected to a single antenna system.