[. . . ] Disconnect the () negative lead from your vehicle's battery. · Check clearances on both sides of a planned mounting surface before drilling any holes or installing any screws. · At the installation sites, locate and make a note of all fuel lines, hydraulic brake lines, vacuum lines and electrical wiring. Use extreme caution when cutting or drilling in and around these areas. [. . . ] 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). The GTO301. 1II, GTO601. 1II and GTO1201. 1II amplifiers are not equipped with high-level inputs. NOTE: When using the high-level inputs, the AUX outputs can be used to pass a line-level signal to another amplifier. Wire Gauge Chart Amplifier Maximum Minimum Model Current Draw Wire Gauge 34A #8 AWG GTO75. 2 II 85A #8 AWG GTO75. 4 II GTO755. 6 II 87A #8 AWG 40A #8 AWG GTO301. 1II 69A #6 AWG GTO601. 1II GTO1201. 1II 115A #4 AWG These recommendations assume 7' 10' wire runs. If your installation differs markedly, you will need to adjust the wire gauge accordingly. IMPORTANT NOTE: If you are planning to use optional neon tubes, install them before making any electrical connections to the amplifier (refer to"Installing Neon Tubes" on page 6).
Figure 1. Terminal connection end plate.
GTO75. 2 II
2
APPLICATIONS GTO301. 1 II, GTO601. 1 II AND GTO1201. 1 II
The GTO subwoofer amplifiers are single-channel amplifiers. There are two sets of terminals to make it easy to connect multiple woofers. Either set of (+/) terminals may be used when connecting woofers. To the right are two application diagrams to help plan your subwoofer system installation. Figures 2 and 3 show how to configure the GTO subwoofer amplifiers (models GTO301. 1II, GTO601. 1II and GTO1201. 1II). NOTE: For simplicity, Figures 2 and 3 do not show power, remote and input connections. NOTE: Minimum speaker load is 2 ohms.
GTO Amplifier
(partial end panel)
GTO Amplifier
(partial end panel)
+
+
+
Subwoofer
Subwoofer
Subwoofer
Figure 2. GTO subwoofer amplifier with one woofer connection.
APPLICATIONS GTO75. 2 II
The JBL GTO75. 2 II amplifier can be set up for stereo or bridged-mono operation, as shown in Figures 4 and 5.
HP LP FLAT
HP
LP FLAT
NOTE: For simplicity, Figures 4 and 5 do not show power, remote and input connections. Minimum speaker impedance for bridged operation is 4 ohms.
MODE
FREQ
MODE
FREQ
GTO75. 2 II
(partial end panel)
GTO75. 2 II
(partial end panel)
+
+
+
Subwoofer
Figure 4. GTO75. 2 II amplifier set up for bridgedmono operation.
3
APPLICATIONS GTO75. 4 II
The GTO75. 4 II can be set up for stereo 4-channel, 3-channel or bridged 2-channel operation, as shown in Figures 6 through 8. NOTE: For simplicity, Figures 6 through 8 do not show power, remote and input connections. Minimum speaker impedance for bridged operation is 4 ohms.
+ +
+
+
GTO75. 4 II
(partial end panel)
+
Figure 6. GTO75. 4 II amplifier in 4-channel (stereo) operation to drive front and rear full-range speakers.
Subwoofer
+
GTO75. 4 II
(partial end panel)
+
Figure 7. GTO75. 4 II is set up for 3-channel operation to drive a set of full-range speakers and a subwoofer.
+
GTO75. 4 II
(partial end panel)
+
Figure 8. GTO75. 4 II used in bridged 2-channel mode to drive a set of components or subwoofers.
4
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. [. . . ] 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. 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. [. . . ]