iDR D-Out is an add-on digital audio expander for the iDR-4 and iDR-8 audio mix processors. It provides AES3 and SPDIF format digital audio outputs to add to the analogue audio connections on the main unit. The iDR D-in has 8 inputs arranged as 4 pairs. The iDR D-out has 8 outputs arranged as 4 pairs. These provide AES3 and SPDIF outputs simultaneously available. Only one input and one output expander may be added to the iDR system bringing it up to a maximum 16×16 audio matrix. This may be any combination of the analogue and digital expanders available for the iDR system. These units do not have any processing built in. They simply convert the AES3 and SPDIF formats to work with the 8 channel wide iDR digital bus which feeds the main unit via a CAT5 STP cable. The processing and mixing is handled by the main iDR-4 or iDR-8 unit which features the full 16×16 DSP matrix. iDR D-out has 8 front panel LEDs in addition to the 3 status indicators. These are 3-colour soft LEDs which can be assigned as audio meters, mute indicators or patch related indicators. They are programmed in the usual way using the iDR System Manager software. Control of the expanders is via the DR-Link port using a CAT5 STP cable. This means that two CAT5 cables are required to interconnect an expander to the main unit. Maximum distance between the units is 250 metres. Local mains power is required. iDR D-out can be rack mounted or free standing. There are no user controls on the front panel, only the status and assignable LEDs.