car audio power amplifier owner’s manual THANK YOU for purchasing a JBL Grand Touring® Series amplifier. In order that we may better serve you should you require warranty service for your new amplifier, please retain your original purchase receipt and return the enclosed warranty registration card.
INSTALLATION WARNING: Playing loud music in an automobile can hinder your ability to hear traffic and permanently damage your hearing. We recommend listening at low or moderate levels while driving your car. JBL accepts no liability for hearing loss, bodily injury or property damage resulting from the use or misuse of this product. IMPORTANT: To get the best performance from your JBL Grand Touring® Series amplifiers, we strongly recommend that installation be entrusted to a qualified professional.
APPLICATIONS – GTO301.1, GTO601.1 AND GTO1201.1 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 GTO301.1, GTO601.1 and GTO1201.1).
APPLICATIONS – GTO75.4 The GTO75.4 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. NOTE: Minimum speaker impedance for stereo operation is 2 ohms. Minimum speaker impedance for bridged operation is 4 ohms. Figure 6. GTO75.4 amplifier in 4-channel (stereo) operation to drive front and rear full-range speakers. Figure 7. GTO75.
APPLICATIONS – GTO755.6 Subwoofer Rear Front – – – + + + The GTO755.6 can be configured for 6-channel, 5-channel or 3-channel operation, as shown in Figures 9 through 11. 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 Rear – + – + Front Figure 9. 6-Channel operation: GTO755.
INSTALLATION AND SETUP SETTING THE CROSSOVER(S) SETTING INPUT SENSITIVITY REMOTE LEVEL CONTROL Determine your system plans and set the crossover mode switch accordingly. If you plan to use the GTO75.2 or GTO75.4 to drive full-range speakers, set the crossover mode to FLAT and skip to “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.
INSTALLATION AND SETUP To Neon Power Supply To Neon Power Supply Figure 13. Installing neon tubes in a JBL GTO amplifier.
SPECIFICATIONS GTO301.1 GTO601.1 GTO1201.1 • 1 x 204W RMS channel at 4 ohms and ≤1% THD + N • Signal-to-noise ratio: 77dBA (reference 1W into 4 ohms) • 1 x 294W RMS channel at 2 ohms, 14.4V supply and ≤1% THD + N • Dynamic power: 320W at 2 ohms • Effective damping factor: 6.39 at 4 ohms • Frequency response: 10Hz – 302Hz (–3dB) • Maximum input signal: 4.7V • Maximum sensitivity: 220mV • Output regulation: .
