The Midas DL371PRO9-01 for the Midas PRO9 Digital Mixing Console is a 7U 19″ rack-mount unit, which houses up to 7 DSP audio processing cards and routing hardware. Employing an advanced FPGA (Field Programmable Gate Array) architecture, it has three removable power supplies, only two of which are required for full operation. The power supplies are auto-voltage sensing, auto-switchover, hot swappable, outfitted with locking AC connectors, and are identical to, and therefore interchangeable with, the PSUs in the control center. The engine has dual-redundant HyperMAC ports, in CAT-5e and optical variants, which provides the digital equivalent of a 384-way (192 in + 192 out) multi-core between the stage and FOH (Front of House).

The DL371PRO9-01 also has eight AES50 ports, which facilitate connections to the PRO Series DL351 stage box, and/or other AES50 I/O hardware. It is also possible to use any PRO Series with DL251, DL351, DL451 and DL431, plus the Klark Teknik DN9696 high-resolution audio recorder and DN9650 network bridge. The processing engine is loaded with 6 modules in the standard configuration.

The system is designed so that it can be expanded over time as the needs of the end user evolve. The PRO3 version of the DL371 DSP engine can be upgraded to the PRO6 version by the addition of a fifth processing card, as well as the appropriate licensing installation on the control console. Similarly the PRO6 version can be upgraded to the PRO9 version with the addition of a sixth card. All three models include an extra-cost option of adding an N+1 redundant card, which will automatically assume processing roles in the event of a card failure within the system.