GROUND ZERO High-Performance Class D Amplifier GZRA 2HD Owner’s Manual

GERMAN ENGINEERING
2-CHANNEL
AMPLIFIER
GZRA 2HD
Owner´s Manual

Features

• High-performance class D amplifier
• 2 ohms stable in stereo mode
• 4 ohms stable in bridged mode
• High-level input with auto-on feature
• Adjustable wideband active crossover
• Bass boost control (0-12 dB @ 45 Hz)
• Adjustable input sensitivity
• Wired bass level remote control (separately available) (GZTA Bassremote)
• Turn-on delay
• Thermal protection circuit

RADIOACTIVE SERIES
GROUND ZERO GZRA 2HD

Mounting instructions

• As a precaution, it is recommended to disconnect the vehicle’s battery before mounting the amplifier. Note: For new vehicles,  disconnecting the battery might cause various errors in your vehicle´s electric system that can be cleared only by authorized service partners of your vehicle´s manufacturer! Please ask your service partner first before disconnecting the battery!

• The power supply wire (+12 V) has to be protected within max. 20 cm / 8” by the main fuse holder with a fuse value matching the  recommendation for your amplifier
  Note: If there is more than one amplifier connected using this power wire, the main fuse value must be equal to the sum of the recommended fuses of all connected devices. However, make sure the diameter of your power wire will be enough for the required current!

• If necessary, replace a defective fuse with a fuse with identical quality and value

• Never drill holes to the vehicle´s gas tank, brake lines, wirings, or any other important vehicle parts!

• Never pass wires over sharp edges or vehicle parts due avoid any kind of damage

• Keep the wiring away from the antenna and electronic devices contributing to radio reception

• Lay the power supply wiring always separated from speaker wiring to avoid disturbance

• The amplifier contains a temperature protection circuit that turns the device off in case of overheating. After a certain cooling time, it will turn on automatically. To avoid heat build-up, enough air supply for cooling must be provided. Never cover the surface  f the amplifier´s heatsink entirely

• The amplifier should NEVER be mounted onto a vibrating part or surface such as a subwoofer enclosure. This might lead to malfunction due to loosened electrical parts inside the amplifier.

• Some amplifiers offer a high-level input option, however, if a pre-amplified output (RCA) is available (at the head unit), it is strongly recommended to make use of it.

Terms of warranty

The limited warranty for this product is covered by GROUND ZERO´s regional distribution partners and their terms and conditions. For further information contact your local retailer or distributor.

Recommended wiring

GROUND ZERO products are engineered in Germany
GROUND ZERO – international sponsor

Controls & Features

1| Power terminal| , 12V To be connected to the positive terminal of the battery
REM To be connected to the remote output of the head unit’ not etiquette in high-level input mak;
GND  To be connected to the vehicle’s ground io• &eat, to Entrega e te rrt rat. of the binttii
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2| Fuse(s)| If necessary to replace a defective fuse, it’s strongly recommended to use a fuse with an identical value
3| Speaker terminal| To connect the speaker wires min. 2 ohms load in stereo mode min. 4 ohms load in bridged mode
4| Bass boost control| To increase the boss level at 45 Hz up to 12 dB
5| Line input (RCA)| Input sockets to connect RCA wires

Important note: High-level and RCA inputs should never be used simultaneously! This may cause serious damage to the amplifier

6| High-level Input| Head units without RCA pre-amplifier output signal can be connected using the high-level input to conned the speaker output of the head unit directly.

If used, the amplifier turns on automatically (auto-on feature) The remote input of the power supply terminal remains unused Important note: High-level and RCA inputs should newer be used simultaneously! This may cause serious damage to the amplifier

7| Sensitivity control| Controller to adjust the input sensitivity
8| Low pass filter| To adjust the required crossover point. Frequencies above the selected crossover point will be filtered (40 Hz to 4000 Hz)
9| High pots filter| To adjust the required crossover point. Frequencies below the selected crossover point will be filtered (40 Hz to 4000 Hz)
10| Status indication| POWER(green) ok (correct operation)
PROTECT (red) error (protection mode)
11| Remote socket| To connect the wired bass level remote control (available separately)

RCA input wiring

High-level input wiring

High-level input wiring

Speaker wiring in stereo mode

Speaker wiring in bridged mode

Specifications

RMS Power @ 4 Ω
CEA Stncird CEA2006-A| 2x 285 W (nsTHD+N)
RIMS Power @ 2 Ω
CEA Standard CEA.2006-A| 2x 450 W 0% THD+14
RMS Power @ 4 Ω in bridged mode
CEA Standard CEA.2005-A| Ix 900W (msto+t;
lx 1150W onsto+N)
Low pass filter| 40 It – 4000 Hz (12 d8/oct)
High pass fiber| 40 Hz -4003Hz (12 d8/oct)
Frequency response| 10Hz -25 kHz
Signal to noise ratio (SNR)| -101.9d8
Total harmonic distortion (THD+N)| < 0.1%
Damping factor| > 200
Input sensitivity| 200 mV- 5.3 V
Fuse(s)| 3x 30A
Recommended main fuse| 100A
Dimensions
w x h x I (heotsink / overall)| 186 x 52 x 229/268 mm
Dimensions
w x h x I (heatsink / overall)| 7.32 x2.05 x 9.02/10.5V

Troubleshooting guide

of the amplifier (harness)
Check remote wire connection (RCA input mode)
Check +12 Volt power supply wire connection Check ground wire connection
Did the PROTECT LED turn red?| Check for speaker short or amplifier overheating
Device does not turn on| Power supply of the amplifier?| Check power wire or connections
Remote wire-powered? (RCA input mode)| Check remote wire connection to the head unit
No sound on one channel| Speaker wiring undamaged?| Check for short circuit or open connections
Input signal on each RCA lead?| Reverse left and right RCA inputs to check the audio input signal
The device turns off at medium / high volume| Load impedance of each speaker correct?| Check if each speaker load impedance matches the technical specifications of the amplifier
Status LED turned on red| Temperature protection circuit active| Decrease head unit’s volume / wait for cooling
Speaker wires short / speaker damaged| Check speaker/wires and insulate if necessary

Listening to music can be emotional, impressive, relaxing, or enjoyable. At that, it doesn´t really matter what kind of music is the personal favorite, whether it´s Instrumental, Jazz, Electro, Latin, Classical, Rock, or any other music direction. However, audio reproduction quality at each desired volume is elementary. Some music styles require higher levels while others prefer soft tones.

GROUND ZERO considers all the different wishes of customers during the development of new products. Along with this, the target is to create the most realistic sound, to transfer the soul of the music and the intention of the performer. Summarized to one phrase: RESPECT THE MUSIC!

http://www.ground-zero- audio.com

| Ground Zero GmbH
Erlenweg 25, 85658 Egmating, Germany
Tel. +49 (0)8095/873 830
Fax -8310
www.ground-zero-audio.com|
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References

• Ground Zero Audio – Car Audio Products

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