RX45 is a 1U rack-mountable audio matrix feeding 4 selectable inputs to 5 stereo outputs. An inbuilt audio player section features playback from USB media, DAB+ tuner or Bluetooth. Each zone output has a push button and LED ladder on the front panel for selecting the input source and adjusting level and tone settings in the master section. Connecting optional TR86 wall plates via CAT5 cable enables remote source and level selection for any zone. The output for the selected zone may be monitored through a headphones output on the front panel. The RX45 system is expandable using multiple RX45 units cascaded together via dual CAT5 links, with DIP switches to assign one of 8 different IDs to each connected RX45 unit, providing up to 40 distinct zones. Additional DIP switches can be set to link the audio player from one unit to one or more connected slaves. An optional CS-20 call station can be used to address up to 20 different zones for announcements.