Sound System Protection in 2 easy steps... Step 1: Insert key to `unlock' front panel and adjust VU meter pre-set until the peaks of the incoming audio illuminate the red endstop 0dB LEDs. Step 2: Adjust max output level pre-set until sound system volume reaches the maximum permitted SPL as specified by the installer or client. Remove key... and sleep soundly. The new Drawmer SP2120 Speaker Protector offers both strict level control and tremendous peace of mind to the contractor, installer...