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Detailed instructions for use are in the User's Guide.
[. . . ] Never connect left and right channel speaker cables to each other or to the vehicle body. This unit is designed for 12 VDC, negative ground systems. Make sure that your vehicle has this type of electrical system before connecting the power cable. When making connections to the car's electrical system, be aware of the factory installed components (e. [. . . ] You can then increase amplifier gain until the sound from the speakers becomes distorted. 4 Crossover Frequency Adjustment Knob (MRPF257 only) Permits adjustment of the crossover frequency, by rotating the knob to select any frequency between 50 to 200 Hz as the crossover point. 1 Crossover Mode Selector Switch (MRP-F257) a) Set to the "HP" position when the OFF HP amplifier is used to drive a tweeter/ midrange system. the frequencies below the crossover point will be attenuated at 18 dB/octave. B) Set to the "OFF" position when the OFF HP amplifier will be used for driving full-range speakers. The full frequency bandwidth will be output to the speakers with no high or low frequency attenuation. 2 Crossover Mode Selector Switch (MRP-F256/ MRP-T306) a) Set to the "LP" position when the OFF HP LP amplifier is used to drive a subwoofer. the frequencies above the crossover point will be attenuated at 18 dB/octave. B) Set to the "HP" position when the OFF HP LP amplifier is used to drive a tweeter/ midrange system. the frequencies below the crossover point will be attenuated at 18 dB/octave. OFF HP LP c) Set to the "OFF" position when the amplifier will be used for driving full-range speakers. The full frequency bandwidth will be output to the speakers with no high or low frequency attenuation. 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. Do not connect this lead to the fuse block. Locate the unit and route the leads at least 10 cm away from the car harness. â· Keep the battery power leads as far away from other leads as possible. â· Connect the ground lead securely to a bare metal spot (remove the coating if necessary) of the car chassis. â· If you add an optional noise suppressor, connect it as far away from the unit as possible. Your Alpine dealer carries various Alpine noise suppressors, contact them for further information. â· Your Alpine dealer knows best about noise prevention measures so consult your dealer for further information. 5 RCA Input Jacks Connect these jacks to the line out leads on your head unit using RCA extension cables (sold separately). [. . . ] If any of the above conditions exist, the remote turn-on lead of your MRP-F257/MRP-F256/ MRP-T306 must be connected to a switched power source (ignition) in the vehicle. Be sure to use a 3A fuse as close as possible to this ignition tap. Using this connection method, the MRP-F257/MRP-F256/ MRP-T306 will turn on and stay on as long as the ignition switch is on. If this is objectionable, a SPST (Single Pole, Single Throw) switch, in addition to the 3A fuse mentioned above, may be installed in-line on the MRP-F257/ MRP-F256/MRP-T306 turn-on lead. [. . . ]
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