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SubwooferRightLeft– + + – + – GTO755.6 II (partial end panel) 5 APPLICATIONS – GTO755.6 II The GTO755.6 II can be configured for 6-channel, 5-channel or 3-channel operation, as shown in Figures 9 through 11. Input Mode Switch: • Use INT (internal mode) to send a signal from the front and rear inputs to the subwoofer. • Use EXT (external mode) when sending a dedicated signal to the subwoofer inputs; e.g., if your source unit has a subwoofer output. NOTE: For simplicity, Figures 9 through 11 do not show power, remote and input connections. NOTE: Minimum speaker impedance for stereo operation is 2 ohms. Minimum speaker impedance for bridged operation is 4 ohms. Subwoofer– + – + + – + – + – + – GTO755.6 II (partial end panel) SubwooferRear RightFront RightRear LeftFront Left SubwooferRear RightFront RightRear LeftFront 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 APPLICATIONS – GTO755.6 II The GTO755.6 II can be configured for 6-channel, 5-channel or 3-channel operation, as shown in Figures 9 through 11. Input Mode Switch: • Use INT (internal mode) to send a signal from the front and rear inputs to the subwoofer. • Use EXT (external mode) when sending a dedicated signal to the subwoofer inputs; e.g., if your source unit has a subwoofer output. NOTE: For simplicity, Figures 9 through 11 do not show power, remote and input connections. NOTE: Minimum speaker impedance for stereo operation is 2 ohms. Minimum speaker impedance for bridged operation is 4 ohms. Subwoofer– + – + + – + – + – + – GTO755.6 II (partial end panel) SubwooferRear RightFront RightRear LeftFront Left SubwooferRear RightFront RightRear LeftFront 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. Figure 9. 6-Channel operation: GTO755.6 II amplifier driving full-range front and rear speakers and a pair of subwoofers. 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. 6 6 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. SETTING INPUT SENSITIVITY 1. Initially turn the INPUT LEVEL control(s) to minimum (counter clockwise). 2. Reconnect the (–) negative lead to the vehicle’s battery. Apply power to the audio system and play a dynamic music track. 3. On the source unit, increase the volume control to 3/4 volume. Slowly increase the INPUT LEVEL control(s) toward three o’clock until you hear slight distortion in the music. Then reduce the INPUT LEVEL slightly until distortion is no longer heard. NOTE: After the source unit is on, red LEDs (on the top panel) will light, indicating the amplifier is on. If not, check the wiring, especially the remote connection from the source unit. Also refer to “Troubleshooting” on the next page. Figure 12. Control end panel. REMOTE LEVEL CONTROL The GTO755.6 II and all three GTO subwoofer amplifiers have inputs for an optional remote level control (RLC). This will allow the amplifier’s input level to be adjusted from the listening position. Connect the optional remote level control using the RJ-11 jack on the side of the amplifier. Install the control module in the front of the vehicle within easy reach of the driver. Under the dash or in the center console are both suitable locations. SETTING THE BASS BOOST The GTO755.6 II, GTO301.1II, GTO601.1II and GTO1201.1II are all equipped with a bass- boost 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 addition...
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