JBL GT-X646 User Manual

GT-X646
Owner’s Manual
GT-X646
amplifier
INSTALLATION WARNINGS AND TIPS
• Disconnect the negative (–) lead from your vehicle’s battery.
• At the installation site, 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.
• Choose a safe mounting location away from moisture.
• Make sure there is sufficient air circulation at the mounting location
for the amplifier to cool itself.
• Mount the amplifier, using the supplied hardware.

JBL GT-X646 Specifications

Power

power at 4 ohms	70W RMS x 4
power at 2 ohms	100W RMS x 4
total max power	800W

Audio Performance

total harmonic distortion + noise	0.05%
signal-to-noise ratio	101dBA
frequency response	10Hz – 100kHz

Input Specifications

maximum input signal	6V
maximum sensitivity	200mV

Summary

Installation Warnings and Tips

Amplifier Components and Controls

Speaker Output Connectors

Connect speakers to terminals, observing proper polarity for various channel operations and minimum impedance.

Fuses

Replace fuses only with the same type and rating for proper protection.

Power Input Connectors

Connect +12V to battery, GND to chassis, and REM to the source unit's remote out lead.

Auxiliary Output Connectors (RCA)

Summed, non-filtered pass-through outputs for front/rear inputs to an additional subwoofer amplifier.

Front Input Connectors (RCA)

Connect to the front RCA outputs from the source unit or signal processor.

Front Input-Level Control

Matches the front input level of the amplifier to the source unit's output level.

Front Crossover-Frequency Control

Variable 12dB/octave crossover from 32Hz to 320Hz for front channels.

Front Crossover-Filter Selector

Selects crossover filter type (LP, FLAT, HP) for front channels based on speaker setup.

Power On LED

Indicates that the amplifier is powered on.

Protect LED

Illuminates under fault conditions like over/under voltage or short circuits.

Rear Bass-Boost Control

Provides up to 6dB boost at 50Hz for rear channels.

Rear Crossover-Frequency Control

Variable 12dB/octave crossover from 32Hz to 320Hz for rear channels.

Rear Crossover-Filter Selector

Selects crossover filter type (LP, FLAT, HP) for rear channels based on speaker setup.

Rear Input-Level Control

Matches the rear input level of the amplifier to the source unit's output level.

Rear Input Connectors (RCA)

Connect to rear RCA outputs from the source unit or signal processor.

Setting the Input Level

Procedure to adjust front and rear input levels for optimal sound clarity.

Setting the Crossover

Guidance on setting crossover frequencies for different speaker types and system configurations.

Specifications