Control And Functions - Ground Zero NUCLEAR GZNA 2800X Mode D'emploi

Control and Functions

(1.) Speaker Terminals
Refer to page 11 - page 15 (CONNECTING THE SPEAKER)
(2.) Low Level Input RCA jacks : These inputs are for signal cables from the source, always use high quality RCA
type shielded cables.
(3.) Input Sensitivity Adjustment : This control adjusts the amplifier's input sensitivity. Input sensitivity is variable
from 100mV to 8V. (GZNA 4350X: 200mV to 8V) Clockwise increases sensitivity. Counterclockwise decreases
sensitivity. This knob is not a volume control for the amplifier. The amplifier can be driven to full power
with a wide range of signal levels. A lower signal level will require increased sensitivity for full power. A higher
signal level will require decreased sensitivity.
(4.) Bass Boost Controls : Allows the addition of up to +12dB increase in sound level in lower frequencies
(0~12dB)(GZNA 4350X: 45Hz).
(5.) Bass Boost Frequency (30Hz - 50Hz): GZNA 2800X only o
(6.) Phase Shift Controls (0~180 ) Allows the optimum alignment of audio output at speakers for best sonic
imaging.
(7.) CROSSOVER : Adjust the crossover for your chosen installation method.(GZNA 2800X)
- LPF : Low pass filter - only bass tones (30Hz - 150Hz) go to speakers. Use with
woofer or sub-woofer.
- FULL : No filter-all tones go to speakers. Use with full-range speakers.
(8.) CROSSOVER : Adjust the crossover for your chosen installation method.(GZNA 4350X)
- LPF : Low pass filter - only bass tones (30Hz - 500Hz) go to speakers. Use with
woofer or sub-woofer.
- FULL : No filter-all tones go to speakers. Use with full-range speakers.
- HPF : High pass filter - only MD - high tones (10Hz - 3KHz) speakers.
- Band Pass : 30Hz - 500Hz
(9.) CROSSOVER : Adjust the crossover for your chosen installation method.(GZNA 4350X)
- LPF : Low pass filter - only bass tones (30Hz - 150Hz) go to speakers. Use with
woofer or sub-woofer.
- FULL : No filter-all tones go to speakers. Use with full-range speakers.
- HPF : High pass filter - only MD - high tones (10Hz - 3KHz) speakers.
(10.) Variable Low-Pass Filter : For use as a dedicated sub-woofer channel, set filter
switch to "LPF". Adjust variable crossover frequency with control as desired.
The amplifier input circuit filters out everything above 30Hz-----150Hz (dependent
on the adjustment of the frequency control), so only the deepest bass notes are
amplified. (GZNA 2800X: 30Hz - 150Hz / GZNA 4350X: 30Hz - 500Hz)
(11.) Variable High-Pass Filter : For use as a dedicated mid high range
channel, set filter switch to "HPF". The input circuit filters out all frequencies below
40Hz-----3KHz. (GZNA 4350X: 10Hz - 3KHz)
Variable Subsonic Filter. (GZNA 2800X: 10Hz - 40Hz / GZNA
4350X: 10Hz - 3KHz)
(12.) Remote Bass Control Connector (Fig2)
(13.) Led : PWR (Power) - This GREEN LED will illuminate when
the amplifier is turned "ON".
If it fails to illuminate, check the power connections to the
Amplifier and fuses.
PRT ( Protection) - The amplifier protection circuitry will disable the amplifier if input
overload, short circuit or extremely high temperature conditions are detected.
When the protection mode is in operation, the LED indicator on the side panel will
be illuminated, indicating the amplifier has gone into a self-preservation mode.
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Adjustment and tuning
TURNING ON THE AMPLIFIER
The amplifier automatically turns on a few seconds after you turn your vehicle's ignition switch to ACC or ON or
turn on your auto sound system, depending on how you sired the system. The POWER LED on the side of the
amplifier lights when the amplifier is on.
Important : Your amplifier requires 240 amps or more of power from your vehicle's battery during operation. To
protect your battery from discharging, do not operate the amplifier unless your vehicle is running.
Note : Your amplifier temporarily shuts down if it gets too hot, then restarts
automatically once it cools.
ADJUSTING THE AUDIO LEVEL
For the best performance, you must set LEVEL (MIN / MAX) on the side of the amplifierto adjust the level of the
audio signals that enter the amplifier.
1. Use a screwdriver to turn LEVEL (MIN/MAX) fully counterclockwise to MIN
2. Turn the auto sound system's volume control to about one-third of its full range.
3. Adjust LEVEL (MIN/MAX) to a comfortable listening level.
4. Turn up the auto sound system's volume control until the sound begins to distort.
Then immediately turn the volume down to a point just before where the distortion
began.
Caution: Never turn up the auto sound system's volume control more than needed
to adjust the audio level, more than two thirds of its maximum volume.
5. Adjust LEVEL (MIN/MAX) until the sound is at the maximum level you want the
amplifier to produce.
6. Adjust the auto sound system's volume control to a comfortable listening level.
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