EXP1x Remote Audio Expander on August 30, 2015 | Marketing Team The EXP1x Remote Audio Expander The EXP1x adds eight RAD ports to a HAL1x via the Expansion Bus. The EXP1x requires a HAL1x to operate. DR remotes are also supported on any RAD port, so the EXP1x also adds additional DR remotes. The graphic below shows most of the range of RADs and DRs that connect with shielded CAT 5e cable (or better). 512 inputs and 512 outputs are possible if 32 EXP1x Expanders are cascaded to a HAL1x. All of the RAD input and output devices are found here. Specifications for the EXP1x are in the HAL1x and Expanders Data Sheet (6M)