[. . . ] GTO752 OWNER'S MANUAL 4x 1x 1x 10-3/8" 263mm 12-1/4" 310mm 0 1 2 2-1/8" 53mm 56 78 34 B A B C 9A C D E A B C GTO752 CAR AUDIO POWER AMPLIFIER OWNER'S MANUAL Installation Warnings and Tips · Disconnect the negative (­) lead from your vehicle's battery. · At the installation sites, locate and make a note of all fuel lines, hydraulic brake lines, vacuum lines and electrical wiring. [. . . ] · FLAT: Select for full-range speakers when no subwoofer will be used in the system. · HPF: Select for midrange speakers or full-range speakers when a subwoofer is used in the system. 8 Bass-Boost Control · Set the Bass-Boost control according to your preference, being careful not to apply enough boost to damage your speaker(s). A Protect LED · Illuminated under any of the following fault conditions: battery over/under voltage, short circuit in speaker wires, amplifier is too hot, amplifier's output circuit has failed (DC voltage is present in the amplifier's output). B Setting Input Level A Turn Input-Level control counterclockwise to 6V (minimum). B With a dynamic music track playing, turn the head unit's volume control to the 3/4 position. C Turn Input-Level control clockwise until the music is so loud that it no longer sounds clear (distortion is present in the output). D Turn Input-Level control counterclockwise gradually, just until the music sounds clear, once again. C Setting the Crossover A Crossover setting for 5" or larger full-range speakers when no subwoofer is included in the system. B Crossover setting for midrange and/or full-range speakers when a subwoofer is included in the system. [. . . ] JBL is a trademark of Harman International Industries, Incorporated, registered in the United States and/or other countries. 2, route de Tours 72500 Château du Loir France declare in own responsibility that the product described in this owner's manual is in compliance with technical standards: EN 55013:2001+A1:2003 EN 55020:2002+A1:2003 Klaus Lebherz Harman Consumer Group, Inc. [. . . ]