Ground Zero RADIOACTIVE Series User manual

Die Gewährleistung entspricht der gesetzlichen Regelung. Eine Rücksendung kann nur nach vorheriger
Absprache und in der Originalverpackung erfolgen. Bitte unbedingt einen maschinell erstellten
Kaufbeleg und eine Fehlerbeschreibung beilegen. Von der Gewährleistung ausgeschlossen sind Defekte,
die durch Überlastung, unsachgemäße Behandlung oder bei Teilnahme an Wettbewerben entstanden
sind. Wir behalten uns das Recht vor, zukünftig nötige Änderungen oder Verbesserungen an dem
Produkt vorzunehmen ohne den Kunden darüber zu informieren.
Limited warranty - defective products must be returned in original packaging - please add a copy of the
original purchasing invoice showing the purchasing date and a detailed description of the failure. Failure
caused by overload, misuse or by using the product for competition purpose are not covered by the
warranty. We reserve the right to make needed change or improvement to the product without informing
customer about this in advance.
De Garantie bepalingen van alle door ground zero geleverde producten is volgens wettelijke
bepalingen geregeld, Een retourzending kan alleen na duidelijke afspraak en in de originele
verpakking plaatsvinden.SVP een aankoopbon en een duidelijke storingsomschrijving bijvoegen.Van
garantie uitgesloten zijn defecten door overbelasting, onkundig gebruik, of door deelname aan
wedstrijden (SPL) ontstaan zijn. Wij behouden ons het recht om de nodige veranderingen of
verbeteringen aan het product door te voeren zonder de klant hierover te informeren.
La garantie est conforme aux droits légaux. Un retour du produit défectueux doit être dans son
emballage d'origine sur présentation du reçu ou de la facture indiquant la description du defaut.La
présente Garantie n'est pas applicable lorsque le produit a été endommagé en raison: Mauvaise
alimentation, Trop de puissance (HP,Subwoofer) Accident, Installation ou Utilisation non conforme aux
normes Technique (Concours SPL etc). Nous nous réservons le droit d'entreprendre à l'avenir
nécessairement des modifications ou des
améliorations au produit sans informer le client.
Ground Zero GmbH
Erlenweg 25, 85658 Egmating, Germany
Tel. [phone] Fax -8310
www.ground-zero-audio.com

RADIOACTIVE-SERIES
AMPLIFIER
OWNER’S MANUAL
GZRA MICRO ONE
Features
•High efficient compact amplifier
•1 Channel class D
•2 Ohm stable
•Variable 12dB Bass boost (45Hz)
•Variable Phase shift 0 - 180°
•Variable Subsonic 15 - 25 Hz
•Variable Lowpass 40 - 400 Hz
•Adjustable input sensitivity
•Soft delayed remote turn on
•Stereo RCA input
•High level input including auto-on
•Bass remote control
•Thermal / Short / Overload protection

Tools and materials you need
•Screwdriver
•Electric drill, 3 mm / 0.12” carbide drill bit
•Mounting screws
•Soldering gun
•Power wire min. 8 mm² / 8AWG
•Ground wire min. 8 mm² / 8AWG
•Speaker wire min. 2 x 2,5 mm² / 13AWG
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 in your car. Your gas tank, brake lines or cables 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
additional capacitor (power cap) min. 1 F to guarantee a stable operation voltage.
Planning your system
Before beginning the installation, consider the following:
a) 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.
b) If your radio is equipped with preamplifier outputs (RCA), it is advisable to use them.
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 and drill 4 holes. Then
mount the amplifier with the mounting screws.
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
1
Input level controller
With this controller you can adjust the input sensitivity.
2
Subsonic controller
This controller allows you to filter low frequencies in a range between
15 and 25 Hz. This function reduces the mechanical Xmax and raises
the capacity of the connected subwoofer.
3
Low pass controller
Adjust the variable lowpass frequency to the desired frequency
between 40 and 400 Hz using the controller.
4
Remote volume control
On – If the bass remote controller is connected
Off – If the bass remote controller is not connected
5
Bass boost controller
For adjusting of the bass boost level in the range from 0 to +12 dB.
6
Phase shift controller
This controller allows you to fit the subwoofer channel in-phase to
the front system.
7
Status indication
GREEN – OK
RED – Error
8
High / Low switch
Switch between high and low level (RCA) input.
9
Main connector
Pin 1: GND -> Ground connection (Black)
Pin 2: GND -> Ground connection (Black)
Pin 3: REM -> Remote – on (Red thin)
Pin 4: REM Vol (-) -> Bass remote (Orange/White)
Pin 5: Input left -> Positive signal input L (White)
Pin 6: Input right -> Positive signal input L (Grey)
Pin 7: BATT -> Input power supply +12 Volt (Red thick)
Pin 8: GND -> Ground connection (Black)
Pin 9: OUTPUT +> Positive speaker output SUB (Yellow)
Pin 10: OUTPUT -> Negative speaker output SUB (Darkblue)
Pin 11: REM Vol (+) -> Bass remote (Orange)
Pin 12: Input left -> Negative signal input L (White/Black)
Pin 13: Input right -> Negative signal input L (Grey/Black)
Pin 14: BATT -> Input power supply +12 Volt (Red thick)
1
7
8

Amplifier connection
•The GZRA MICRO ONE comes with a power and signal connector cable. For a reliable connection we
strongly recommend to use the delivered spade connections or solder the joints.
•Make sure input connectors are making good contact with input jacks of the amplifier to avoid shortage or
interruption
•Never use any other connector instead of the original Ground Zero connector. In case of a defective
connector cable, please contact the Ground Zero service.
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.
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.

RCA (low level) wiring

High level wiring

Specifications
Model
GZRA MICRO ONE
Type
1 Channel Class D
RMS Power @ 4 Ω
CEA Standard CEA-2006-A
1 x 220 W (1% THD+N)
1 x 270 W (10% THD+N)
RMS Power @ 2 Ω
CEA Standard CEA-2006-A
1 x 350 W (1% THD+N)
1 x 400 W (10% THD+N)
Damping factor
> 100
Lowpass
40 Hz – 400 Hz
Subsonic filter
15 Hz – 25 Hz
Bass boost
0 ~ +12 dB (45 Hz)
Frequency response
15 Hz – 400 Hz (± 1 dB)
Input sensitivity
200 mV – 5 V (± 5%)
Bass remote control

Fuse
30A
Min Power and GND Wire
8 mm² / 8 AWG
Dimensions
W x H x L mm
75 x 44 x 190
Dimensions
W x H x L inch
2.95“ x 1.73“ x 7.48“
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
Check the nominal load impedance at the
amplifier is equal to or greater than 2 ohms.
(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