The Benchmark rack mount tray is ideal to rack two half wide 1 RU System 1, System 2, or System 3 products. This tray is compatible with all half-wide DAC1, DAC2, DAC3, ADC1 and MPA1 units. Units with or without rack ears can be mounted in this tray (in any combination). This rack tray is required when at least one unit is not equipped wi