Boss Audio BV9973 User Manual - Page 7

Installation NOTES: Choose the mounting location where the unit will not interfere with the normal driving function of the driver. Before finally installing the unit, connect the wiring temporarily and make sure it is all connected up properly and the unit and the system work properly. Use only the parts included with the unit to ensure proper installation. The use of unauthorized parts can cause malfunctions. Consult with your nearest dealer if installation requires the drilling of holes or other modifications of the vehicle. Install the unit where it does not get in the driver's way and cannot injure the passenger if there is a sudden stop, like an emergency stop. If installation angle exceeds 30 from horizontal, the unit might not give its optimum performance. 30 Avoid installing the unit where it would be subject to high temperature, such as from direct sunlight, or from hot air, from the heater, or where it would be subject to dust, dirt or excessive vibration. DIN FRONT/REAR-MOUNT This unit can be properly installed either from "Front"(conventional DIN Front-mount) or "Rear"(DIN Rear-mount installation, utilizing threaded screw holes at the sides of the unit chassis). For details, refer to the following illustrated installation methods. -5-