The DL251 is a 5U 19" fixed-configuration rack I/O unit with 48 mic/line inputs and 16 mic/line outputs. The DL251 is limited to analogue connections only and provides a more cost-effective solution for those not requiring the flexibility of MIDAS modular I/O hardware.

MIDI (in, out and thru) and one Ethernet control port are fitted as standard. Three AES50 ports handle the (n+1) redundant digital audio interface. The DL251 is capable of being switched between 96 kHz and 48 kHz via a front panel switch.

On the rear panel there is a Mute All Outputs button for onstage re-patching. The unit is also equipped with dual-redundant PSUs.