The DSP Mix Engine Card is an option for the VENUE FOH Rack or Mix Rack that enables you to expand the processing power of your VENUE system. Each 9-chip DSP card allows you to increase your system’s processing power for additional TDM plug-in processing. You can install up to five DSP Mix Engine Cards into an FOH Rack (which comes standard with three), or up to three DSP Mix Engine Cards into a Mix Rack (which comes standard with two).