Ground Zero GZTA 5120X-II User manual

TITANIUM-SERIES
AMPLIFIER
OWNER’S MANUAL
GZTA 5120X-II
Features
•4 Ohm / 2 Ohm stable Stereo
•Mosfet dual power supply
•Power & Protection indicator
•Variable 12dB bass boost (45Hz) (Channel 5)
•Variable high pass filter
•Variable low pass filter
•Variable subsonic filter (Channel 5)
•Adjustable input sensitivity
•Soft delayed remote turn- on
•Remote control (Channel 5)
•Thermal / Short / Overload protection

2
Tools and materials you need
•Screwdriver
•Electric drill, 3 mm / 0.12” carbide drill bit
•Mounting screws
•Power wire min. 20 mm² / 4 AWG
•Ground wire min. 20 mm² / 4 AWG
•Speaker wire min. 2 x 1,5 mm² / 15 AWG
Please note!
•As a precaution it is advisable to disconnect the vehicle’s battery before making connection
to the +12 Volts supply wiring (see owner’s manual of your car for further information).
•Please use great caution drilling your trunk. Your gas tank and brake lines can be damaged by puncturing with your drill bit –
this could cause damage or failure of your cars operating systems.
•Never pass wires over sharp angles. It is recommended to buffer the power supply of the amplifier with an capacitor min. 1
Farad to guarantee a stable operation voltage.
WARNING !
High powered audio systems in a vehicle are capable of generating "Live Concert" levels of sound pressure. Continued exposure to
excessively high volume sound levels may cause hearing loss or damage. Also, operation of a motor vehicle while listening to audio
equipment at high volume levels may impair your ability to hear
external sounds such as; horns, warning signals, or emergency vehicles, thus constituting to a potential traffic hazard. In the interest of
safety, Consumer Electronics recommends listening at lower volume levels while driving.
Planning your system
Before beginning the installation, consider the following:
1. If you plan to expand your system by adding other components sometime in the future, ensure adequate space is left, and
cooling requirements are met.
2. If your radio / source is equipped with pre-amp outputs, it is possible to utilize them to drive the amplifier and connecting
(amplifier) to the 2 rear speakers.
Mounting your amplifier
a. Select a suitable location that is convenient for mounting, is accessible for wiring
and has ample room for air circulation and cooling.
b. Use the amplifier as a template to mark the mounting holes, remove the amplifier

3
Warning
Chose a mounting position where all electric wires are protected from being damaged by sharp edges, heat or other conditions. +12Volt
DC electrical connections must be fused on the battery side. Make sure your radio and all other devices will be turned off while connection
your system.
If you need to replace the power fuse, replace it only with a fuse identical to that supplied with the system. Using a fuse of different type or
rating may result in damage to this system which isn’t covered by the warranty.
Controls and functions

4
Controls and functions
1
Speaker terminals
For connection of the speakers
2
Power terminals
GND -> Ground connection
REM -> Remote antenna terminal
BATT -> +12 Volt
3
Satus indication
GREEN – OK
RED – Error
4
Cinch inputs
Terminal for connection of the RCA wires.
To avoid failure, please use high quality RCA wires.
5
Input level controller
With this controller you can adjust the input sensitivity.
6
Mode switch
Adjust the crossover for the chosen utilization.
LPF – Only bass frequencies (below 40Hz - 4000Hz) (Channel 5: 40Hz –
250Hz) will be reproduced.
FULL – All frequencies will be reproduced.
HPF – Only middle and high frequencies over 40 Hz – 4000 Hz will be
reproduced.
8
High Pass controller
(Subsonic)
Set the filter switch to „HIGH“ position.
Adjust the variable HPF crossover frequency to the desired frequency using
the controller. All frequency between 40 Hz – 4000 Hz will be reproduced.
9
Filter controller
Depeding on the mode switch position, High- or Lowpassfilter can be
adjusted in a range from 40 Hz – 4000 Hz with this controller.
10
Subsonic controller
(GZTA 5120X Channel 5)
For adjusting the subsonic filter in a range from 10 Hz to 50 Hz.
11
Input mode switch
You can chose if the 5th channel of GZTA 5120X should be operated with
Cinch input 5/6 or the summation of input 1/2/3/4.
13
Remote control input
For connection of the bass remote control.
Turning on the amplifier
The amplifier automatically turns on a few seconds after you turn on your radio.
Note: Your amplifier temporarily shuts down if it gets too hot, then restarts automatically once it cools
(At about 80° / 176° F).
Adjusting the audio level
1. LEVEL (Min/Max): Turn fully counter- clockwise to MIN position
2. Turn the auto sound system's volume control to about two-third of its full range.
3. Adjust LEVEL to a comfortable listening level.

5
Stereo wiring

6
Bridged wiring

7
Trimode wiring

8
Connecting the speaker for trimode operation - notes
TRI MODE operation output allows a subwoofer to be operated in mono mode while the main speakers are playing in stereo. Leave the
crossover switch on “Full” position.
Use 100 volt, non-polar capacitors for a high pass crossover to filter out low frequencies and Air- core or
Ferrit- ore coils with a minimum diameter of 1 mm / 0.039” for the lowpass crossover to filter out high frequencies.
The capacitor and inductor values as written in the below table. The front and rear channels of this amplifier get this capability. Only the
rear left and right channels are shown on the following pictures.
Values for 6dB passive crossover
Frequency
Inductor
Capacitor
80 Hz
7,5 mH
470 uF
100 Hz
6,5 mH
330 uF
120 Hz
5,5 mH
370 uF
150 Hz
4 mH
220 uF

9
Specifications
Model
GZTA 5120X-II
Type
5 Channel Class A/B
RMS Power @ 4
Ω
CEA Standard CEA-2006-A
4 x 50 W & 1 x 180 W (1% THD+N)
RMS Power @ 2
Ω
CEA Standard CEA-2006-A
4 x 70 W & 1 x 260 W (1% THD+N)
RMS Power @ 4ΩBridged
CEA Standard CEA-2006-A
(1% THD+N)
2 x 130 W (Channel 1 – 4)
RMS Power @ 4ΩBridged
CEA Standard CEA-2006-A
(10% THD+N)
2 x 170 W (Channel 1 – 4)
Damping factor
> 100
Signal to noise Ratio
> 75 dB
Lowpass
40 Hz – 4000 Hz (Channel 1 – 4)
& 40 – 250 Hz (Channel 5)
Highpass
40 Hz – 4000 Hz (Channel 1 – 4)
Subsonic filter
10 Hz – 50 Hz (Channel 5)
Bandpass filter
10 Hz – 250 Hz (Channel 5)
Phaseshift
-
Frequency response
5 Hz – 38 KHz
(± 1 dB)
Input sensitivity
200 mV – 9 V
(± 5%)
THD
< 0,1 %
Bass remote control

Fuse
2 x 35A
Dimensions
W x H x L mm
230 x 53 x 476
Dimensions
W x H x L inch
9.04” x 2.09” x 18.74“

10
Trouble shooting guide
Symptoms
Check Points
Cure
No sound
Is the POWER LED illuminated?
Check fuses in amplifier.
Be sure remote lead is connected.
Check signal leads.
Check again control.
Check tuner/deck volume level.
Is the diagnostic LED illuminated?
Check for speaker short or amplifier
overheating
Amp not switching on
No power to the amplifier
Check power wire or connections
No power to remote wire with
receiver on Check connections to radio
No sound in one channel
Check speaker leads
Inspect for short circuit or an open
connection
Check audio leads
Reverse left and right RCA inputs to
determine if it is occurring before the
amp
Amp turning off at medium / high
volume
Check speaker load impedance
Be sure proper speaker load
impedance recommendations are
observed
(If you use an ohm meter to check
speaker resistance, please remember
that DC resistance and AC
impedance may not be the same.)
Protection LED is on
Temperature shut down
Turn radio volume down
Speaker wires short
Separate speaker wires and insulate