Check the listing for details. ARC Audio LR2 Programmable DSP Level Controller. Condition: New. Listed at 60.00 USD. The ARC Audio LR2 is a programmable single-function remote controller designed to provide direct, intuitive control over select ARC Audio DSPs and DSP amplifiers. As part of the ARC Audio DNA DSP ecosystem, the LR2 allows users to assign one clearly defined control function—such as master system volume, subwoofer level, or bass boost—to a single physical knob for quick, on-the-fly adjustment without accessing software. What sets the LR2 apart is its ability to control up to two ARC Audio DSPs simultaneously, making it an ideal solution for complex multi-processor systems or installations where system-level adjustments must remain perfectly synchronized. When connected to a single processor, the LR2 functions as a dedicated control interface.