[. . . ] Increasing the number of woofers per channel at low frequencies (below 100Hz) produces an acoustic coupling effect. This acoustic coupling effect increases your power output by about 3dB per speaker, or the equivalent of an additional 10W per speaker. [. . . ] Place the amplifier in position, and attach the amplifier to the mounting surface securely using screws. Installation precautions Before you drill or cut any holes, investigate your car's layout very carefully. Take special care when you work near the gas tank, fuel lines, hydraulic lines and electrical wiring. Attach all audio system components securely to prevent damage, especially in an accident. SHOCK HAZARD!There are no user-serviceable parts within the unit. OUTLAW MOSFET Amplifier User's Manual - page 4 Connecting the amplifier Before doing any wiring, look through this manual and identify the diagrams to follow for power, input and speaker connections for your particular installation. Connect the power ground terminal to the closest point on the chassis of the car. Connect the remote terminal to the remote output of the head unit using 16 gauge (or heavier) wire. Connect an empty fuse holder within 18" (45 cm) of the car battery, and run 8 gauge (or heavier) cable from this fuse to the amplifier location. Then connect the fuse holder to the "BATT+" connection on the amplifier. If multiple amplifiers are being used in your system, either: · Run a separate pair of cables from the battery and a chassis ground point to each amplifier. -or· Run a #4 cable from the fuse holder at the battery to a distribution block at or near the amplifier's location. Then run separate cables from the amplifier to this distribution block and to independent chassis ground points. Connect all line inputs and outputs (if used) using high-quality cables. [. . . ] Check that the minimum speaker impedance for the amp model is correct. In some applications, it may be necessary to add external cooling fan(s). [. . . ]