User manual JBL PRO PRFMR

[. . . ] · Before drilling or cutting holes, use a utility knife to remove unwanted fabric or vinyl to keep material from snagging in a drill bit. · When routing cables, keep input-signal cables away from power cables and speaker wires. · When making connections, make certain they are secure and properly insulated. · If the amplifier's fuse must be replaced, use only the same type and rating as that of the original. [. . . ] Power Connection Connect a wire (see chart at right for appropriate gauge) directly to the vehicle's positive battery terminal, and install an appropriate fuse holder within 18" of the battery terminal. Route the wire to the amplifier's location, and connect it to the amplifier's Positive (+12V) terminal. Be sure to use appropriate grommets whenever routing wires through the firewall or other sheet metal. Failure to adequately protect the positive wire from potential damage may result in a vehicle fire. When you are done routing and connecting this wire, you may install the fuse at the battery. Remote Connection Connect the amplifier's Remote (REM) terminal to the source unit's Remote TurnOn lead using a minimum of 18-gauge wire. NOTE: When using the speaker level inputs, connect the remote (REM) terminal to the source unit. If your source unit does not have a remote turn-on connection, connect the amplifier's (REM) terminal to the vehicle's accessory circuit. Speaker Connections Refer to the application guides on the pages that follow. High-Level Input Connections The GTO75. 2 II, GTO75. 4 II and GTO755. 6 II amplifiers are equipped with speaker-level inputs that allow you to add an amplifier to head units that do not have RCA line outputs. The speaker outputs for the source unit should be connected to the amplifier using the supplied connector (square four-wire plug). Minimum speaker impedance for bridged operation is 4 ohms. Subwoofer Rear Left Front Left Figure 9. 6-Channel operation: GTO755. 6 II amplifier driving full-range front and rear speakers and a pair of subwoofers. Subwoofer ­ + Rear Right ­ + Front Right ­ + GTO755. 6 II (partial end panel) ­ + ­ + Rear Left Front Left Figure 10. 5-Channel operation: The same as Figure 9, with the subwoofer output bridged to drive a single 4-ohm subwoofer, providing the speaker with more power. Subwoofer ­ + Right ­ + Left + ­ GTO755. 6 II (partial end panel) Figure 11. 3-Channel operation: GTO755. 6 II amplifier configured for 3-channel operation, where all of the channels are bridged for a subwoofer and a pair of component speakers. 5 INSTALLATION AND SETUP SETTING THE CROSSOVER(S) Determine your system plans and set the crossover mode switch accordingly. If you plan to use the GTO75. 2 II or GTO75. 4 II to drive full-range speakers, set the crossover mode to FLAT and skip to "Setting Input Sensitivity. " Initially set the crossover frequency control midway. While listening to music, adjust the crossover for the least perceived distortion from the speakers, allowing them to reproduce as much bass as possible. Systems using a separate subwoofer set the crossover mode to HP (high pass) for your full-range speakers. Adjust the crossover frequency to limit bass and provide increased system volume with less distortion. For subwoofers, choose the highest frequency that removes vocal information from the sound of the subwoofer. If using the GTO75. 2 II or GTO75. 4 II to drive a subwoofer(s), set the crossover mode to LP (low pass). NOTE: The GTO301. 1II, GTO601. 1II, GTO1201. 1II and the subwoofer output of the GTO755. 6 II are low-pass only and do not have a crossover mode switch. [. . . ] Install the control module in the front of the vehicle within easy reach of the driver. SETTING THE BASS BOOST The GTO755. 6 II, GTO301. 1II, GTO601. 1II and GTO1201. 1II are all equipped with a bassboost control. This allows you to adjust the bass output of your system at 50Hz up to 12dB and enhance low frequency. AUX OUTPUT GTO amplifiers (except GTO755. 6 II) are equipped with full-range outputs that can be used to connect additional amplifiers. [. . . ]