GZIA 2.135 - Receiver Ground Zero - Free user manual and instructions

Product Type	Car Audio Amplifier
Model	GZIA 2.135
Brand	Ground Zero
Power Output	2 x 135W RMS (4 Ohm)
Channels	2
Frequency Response	20 Hz - 20 kHz
Input Sensitivity	0.2V - 6V
Dimensions	320 x 200 x 50 mm (approx.)
Weight	2.5 kg (approx.)
Power Supply	12V DC (car battery)
Main Functions	Audio amplification, low-pass/high-pass filters, bass boost, remote turn-on
Protection	Overload, short circuit, thermal
Installation	Requires power, ground, and remote connections; RCA input
Maintenance	Keep clean, check connections periodically
Safety	Disconnect battery before installation; ensure proper fuse rating
Spare Parts	Replacement fuses, mounting screws

Frequently Asked Questions - GZIA 2.135 Ground Zero

How do I connect the GZIA 2.135 amplifier?

Connect the power wire to the battery (with an inline fuse), ground wire to a clean metal chassis point, remote wire to the head unit's remote output, and RCA cables from the head unit to the amplifier. Ensure all connections are secure and the battery is disconnected during installation.

What is the recommended speaker impedance?

The GZIA 2.135 is stable down to 2 ohms per channel for maximum power output, but for best sound quality, use 4 ohm speakers. Bridge the amplifier to drive a single subwoofer at 4 ohms.

How do I set the gain and crossovers?

Start with the gain at minimum and the crossovers set according to your speakers. For subwoofers, use a low-pass filter (LPF) around 80 Hz. For full-range speakers, use a high-pass filter (HPF) around 80 Hz. Gradually increase gain until you hear distortion, then back off slightly.

Why is my amplifier not turning on?

Check the power and ground connections, ensure the remote wire has 12V when the head unit is on, and verify the fuse is not blown. Use a multimeter to test voltage at the amplifier's power and remote terminals.

Can I use this amplifier with a factory head unit?

Yes, but you may need a line output converter (LOC) to convert the speaker-level signals to RCA. Some factory head units have built-in subwoofer pre-outs, but if not, an LOC is required.

What size fuse should I use?

The GZIA 2.135 typically requires a 30A inline fuse on the power wire. Always use the recommended fuse rating to prevent damage. Check the manual for exact specifications.

How do I connect multiple amplifiers?

Use a distribution block for the power wire and a ground distribution block for the ground. Ensure the remote wire is spliced to all amplifiers. The main power wire should be sized to handle the total current draw.

What is the difference between bridged and stereo mode?

In stereo mode, each channel drives one speaker. In bridged mode, both channels drive a single speaker (usually a subwoofer) for higher power. For the GZIA 2.135, bridge by connecting the positive wire to the left positive terminal and the negative wire to the right negative terminal.

How do I prevent the amplifier from overheating?

Ensure the amplifier has adequate ventilation. Do not mount it in a confined space. Avoid driving the amplifier into clipping by setting gains properly. If thermal protection triggers, let the amplifier cool down before use.

Can I use this amplifier for home audio?

It is possible but not recommended. You would need a 12V power supply rated for the amplifier's current draw (e.g., 30A). The sound quality may not match home audio amplifiers, and the design is intended for automotive use.

USER MANUAL GZIA 2.135 Ground Zero

GROUND ZERO products are engineered in Germany

GROUND ZERO – international sponsor

Ground Zero GmbH

Erlenweg 25, 85658 Egmating, Germany

Tel. [phone] Fax -8310

www.ground-zero-audio.com

IRIDIUM SERIES

2-Channel Class A/B Amplifier

GZIA 2.135

Owner's manual

(AWV2.0)

Main Features

• High-quality class A/B amplifier
• 2 ohms stable in stereo mode
• 4 ohms stable in bridged mode
• Variable high pass filter
- Variable low pass filter
• High-level input with auto-on function
- Adjustable input sensitivity
- Turn-on delay
- Thermal protection
- Short protection
- Overload protection
- Optionally available bass level remote control (GZTA Bassremote)

General mounting instructions

• As a precaution, it is recommended to disconnect the vehicles 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 a 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 by a fuse with identical quality and value
• Never drill holes to the vehicle's gas tank, brake lines, to wirings or any other important vehicle parts!
• Never pass wires over sharp edges or vehicle parts due to 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 of 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 them.

Specifications

Model	GZIA 2.135
Amplifier type	2-channel class A/B
RMS Power @ 4 Ω CEA Standard CEA-2006-A (@ 1 kHz)	2x 85 W (1% THD+N)
RMS Power @ 2 Ω CEA Standard CEA-2006-A (@ 1 kHz)	2x 135 W (1% THD+N)
RMS Power @ 4 Ω in bridged mode CEA Standard CEA-2006-A (@ 1 kHz)	260 W (1% THD+N)300 W (10% THD+N)
Low pass filter	30 Hz – 250 Hz (12 dB/oct)
High pass filter	40 Hz – 3000 Hz (12 dB/oct)
Frequency response	10 Hz – 30 kHz (± 3 dB)
Signal to noise ratio (SNR)	>99 dB
Total harmonic distortion (THD+N)	< 0.02%
Damping factor	>150
Input sensitivity	200 mV – 6 V
Rec. speaker wire	≥ 1.5 mm2 / 14 AWG
Rec. power wire	≥ 10 mm2 / 8 AWG
Fuse(s)	2x 15A
Dimensions w x h x l (heatsink / overall)	192 x 49 x 214/242 mm
Dimensions w x h x l (heatsink / overall)	7.56 x 1.93 x 8.43/9.53"

1	Speaker terminal	To connect the speaker wiresMin. load in stereo mode 2 ohms / channelMin. load in bridged mode 4 ohms
2	Power terminal	+12V To be connected to the positive terminal of the batteryREM To be connected to the remote output of the head unit(*not required in high-level mode)GND To be connected to the vehicle's ground(or directly to the negative terminal of the battery)
3	Fuse(s)	If necessary to replace a defective fuse, its strongly recommended to use a fuse with the identical value
4	High pass filter	To adjust the required crossover point. Frequencies below the selected crossover point will be filtered (40 Hz to 3000 Hz)
5	Low pass filter	To adjust the required crossover point. Frequencies above the selected crossover point will be filtered (30 Hz to 250 Hz)
6	Mode switch	To setup the crossover for the required use of the amplifierFLAT entire frequency range will be reproducedHPF only mid/high frequencies will be reproducedLPF only low frequencies will be reproduced
7	Sensitivity control	Controller to adjust the input sensitivity
8	Line input (RCA)	Input sockets to connect RCA wiresImportant note: High-level and RCA inputs should never be used simultaneously! This may cause serious damage to the amplifier
9	High-level input	Head units without RCA pre-amplifier output signal, can be connected using the high-level input to connect 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 unusedImportant note: High-level and RCA inputs should never be used simultaneously! This may cause serious damage to the amplifier
10	Status indication	POWER (green) ok (correct operation)PROTECT (red) error (protection mode)
11	Remote wire socket	To connect the optionally available bass level remote control

Trouble shooting guide

Symptoms	Check / Cause	Action
No audible sound	Does the POW LED turn to green?	Check protection fuse(s) of the amplifier (harness)Check remote wire connection (RCA input mode)Check +12 Volt power supply wire connectionCheck ground wire connection
	Did the PROTECT LED turned to 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
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

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.

Safety instruction / Manufacturer's declaration

Safety Instructions: Do not expose the device to extreme temperatures, fire, high humidity or direct contact with liquids. Do not use the device if it has been damaged or exposed to liquids. Keep the device, packaging and accessories away from children and pets to prevent accidents and suffocation.

Manufacturer's declaration: Herewith Ground Zero GmbH declares that this product complies with the directive 2014/30/EU (EMC) and further declares that this product is in conformity with the rules of the EU directives (including all applicable amendments) 2011/65/EU RoHS2 and 2001/95/EC General Product Safety directive. The full text of the Declaration of Conformity (EU) is available at the following internet address: www.ground-zero-audio.com. Electronic products contain valuable raw materials and must not be disposed of with normal household waste. At the end of its service life, please bring the device to your local recycling facility.

GROUND ZERO products are engineered in Germany

GROUND ZERO – international sponsor

Ground Zero GmbH

Erlenweg 25, 85658 Egmating, Germany

Tel. [phone] Fax -8310

www.ground-zero-audio.com