User manual ALPINE PDX-1.600M

[. . . ] Bolts or nuts used for the brake or steering systems (or any other safety-related system), or tanks should NEVER be used for installations or ground connections. Using such parts could disable control of the vehicle and cause fire etc. Return it to your authorized Alpine dealer or the nearest Alpine Service Center for repairing. The wiring and installation of this unit requires special technical skill and experience. [. . . ] NOTE: A magnetic screwdriver is recommended to prevent the screw being dropped while tightening. Attach the four joint caps in the four corners of the first unit with 2 machine screws (M2. Stack the second unit on top of the installed unit, aligning the second unit's feet with the joint caps of the first unit. Remove the four corner top caps of the second unit using the hexagon wrench (large, supplied). Insert the four machine screws (M4 x 36, supplied) through the top of the second unit into the four joint caps of the lower unit to connect them together. Next, install the third unit as described for the second unit in B above. Before making connections, be sure to turn the power off to all audio components. Connect the yellow battery lead from the amp directly to the positive (+) terminal of the vehicle's battery. cAUTION Caution on connection terminals/parts · Do not allow other objects (particularly electrically conductive) to get too close or in contact with any of the unit's terminals/parts (power supply, fuse, speaker output terminal, RCA connector, etc. If you make this connection yourself, ensure the connection is correct by following the instructions below carefully. To prevent disconnection of the leads or dropping of the unit, do not carry the unit by the wire. If in doubt, consult your dealer or Customer Support regarding correct wire gauge to use. Strip back between 7-10mm (9/32"-3/8") of the power wire's insulation to expose the conductor. notes: · If the length of the exposed conductor is too short, a poor connection may occur causing operation failure or sound interruption. Conversely, if the exposed conductor is too long, an electrical short-circuit may occur. Loosen the unit's wire terminal hexagon screws, and insert the exposed conductor into the terminal and finally tighten to secure the connection. Locate the unit and route the leads at least 10 cm (3-15/16") away from the car harness. Keep the battery power leads as far away from other leads as possible. Connect the ground lead securely to a bare metal spot (remove any paint or grease if necessary) of the car chassis. If you add an optional noise suppressor, connect it as far away from the unit as possible. Your Alpine dealer carries various noise suppressors, contact them for further information. Your Alpine dealer knows best about noise prevention measures so consult your dealer for further information. [. . . ] Crossover Frequency Adjustment Knob (LP FILTER) Permits adjustment of the crossover frequency, by rotating the knob to select any frequency between 50 to 200 Hz as the crossover point. " Subsonic Filter Mode Selector Switch a) Set this switch to "OFF" to eliminate any SUBSONIC filtering of the low frequencies. This allows the amp and subwoofers to reproduce frequencies above 15 Hz. Those frequencies below 15 Hz, which are inaudible, are filtered and no longer heating up the amplifier. [. . . ]