: Do not mount the unit inverted or vertically with downward airflow. Ensure at least 50mm of clearance around ventilation openings to prevent overheating.
: To prevent accidental changes, press and hold both the Set and Power buttons simultaneously for 3 seconds. Repeat to unlock. Receiver & System Operations
Audio Choice | Qm4 Manual 'link'
: Do not mount the unit inverted or vertically with downward airflow. Ensure at least 50mm of clearance around ventilation openings to prevent overheating.
: To prevent accidental changes, press and hold both the Set and Power buttons simultaneously for 3 seconds. Repeat to unlock. Receiver & System Operations audio choice qm4 manual