Ground Zero GZRA 65.4-MICRO – Plug & Play micro 4-channel ISO amplifier with 4 × 65 watts RMS

The Ground Zero GZRA 65.4-MICRO is an ultra-compact one 4-channel Class D amplifier for simple and space-saving OEM integrations. Thanks to the ISO connection concept, the amplifier can be integrated into many vehicle systems in a particularly easy to install manner and is ideal for driving series loudspeakers or retrofit systems with significantly more power, control and dynamics.

With 4 × 65 watts RMS at 4 ohms, 4 × 75 watts RMS at 2 ohms and 2 × 150 watts RMS in bridge operation at 4 ohms The compact amplifier offers strong power reserves for front and rear systems. The maximum output power is 340 watts. Thanks to the efficient Class D technology, the GZRA 65.4-MICRO works particularly effectively and remains pleasantly compact.

The high level input with Auto-on function makes the amplifier particularly interesting for vehicles with original factory radio. A separate remote signal is not absolutely necessary in many installations as the amplifier can switch on automatically via the speaker signal. The included ISO connection cable makes integration even easier.

Despite its compact design, the GZRA 65.4-MICRO offers practical filter functions for HPF, LPF and BPF. This means that the amplifier can be used flexibly for front systems, rear speakers or in combination with an additional subwoofer amplifier. The easy integration of additional mono amplifiers makes it a very good basis for upgradeable car hi-fi systems.

Highlights

• Ultra-compact 4-channel ISO amplifier
• Ground Zero RADIOACTIVE series
• Plug & Play solution for OEM installations
• High-efficiency Class D technology
• 4 × 65 watts RMS at 4 ohms
• 4 × 75 watts RMS at 2 ohms
• 2 × 150 watts RMS bridged to 4 ohms
• 340 watts maximum output power
• Frequency response from 10 Hz to 22 kHz
• High level input with auto-on function
• ISO connection cable included in delivery
• HPF, LPF and BPF filter functions
• Fixed high pass filter for easy setup
• Stable power supply
• Components in SMD technology
• Compact heatsink with engraved Ground Zero lettering
• Easy integration of additional mono amplifiers possible
• Very space-saving dimensions
• Ideal for upgrading series systems

Technical data

Amplifier type

• Product Type: 4 Channel Amplifier
• Model: Ground Zero GZRA 65.4-MICRO
• Series: RADIOACTIVE
• Type: Micro ISO amplifier
• Amplifier class: Class D
• Channels: 4
• Design: Plug & Play OEM integration
• Circuit concept: highly efficient multi-channel amplifier
• Component technology: SMD technology
• Heat sink: compact aluminum design with engraved Ground Zero lettering

Output power

• Output power at 4 ohms: 4 × 65 watts RMS
• Output power at 2 ohms: 4 × 75 watts RMS
• Output power bridged to 4 ohms: 2 × 150 watts RMS
• Maximum output power: 340 watts
• Operation as a 4-channel amplifier possible
• Operation possible as a 3-channel system, for example front system plus bridged channel
• Operation possible as a 2-channel bridge amplifier
• Suitable for speaker systems with 2 ohm or 4 ohm impedance
• Only use bridged operation at 4 ohms

Frequency range and filters

• Frequency response: 10 Hz to 22,000 Hz
• High pass filter: present
• Low pass filter: present
• Bandpass filter: present
• Fixed high pass filter for easy setup
• Filter functions to adapt to loudspeakers, installation location and system concept
• Suitable for front systems, rear systems or semi-active setups
• With an additional subwoofer, the front system can be relieved using a high pass

Inputs and switch-on function

• High level input: present
• Auto-on function: available
• Integration possible on many factory radios without a classic RCA output
• Automatic switching on possible via the loudspeaker signal
• Easy retrofitting into existing OEM systems
• ISO connection concept for easy installation
• Integration of additional mono amplifiers possible

Operating and additional functions

• Bass Boost: not available
• Phase control: not available
• Remote control: not available
• BIAS control: not available
• Link mode: not available
• Focus on compact design, easy integration and reliable multi-channel performance
• Particularly suitable for unobtrusive sound and performance upgrades

Dimensions

• Dimensions of heat sink: 82 × 185 × 40 mm
• Width: 82mm
• Length: 185mm
• Height: 40mm
• Very compact design for concealed installation
• Suitable for installation locations with limited space
• Depending on the vehicle, it can be mounted under the seat, behind panels, in the dashboard area or in the trunk

Sound interpretation

• More control compared to many standard radio amplifiers
• Stronger dynamics for front and rear speakers
• Cleaner playback at higher volumes
• Better performance reserves for retrofit speakers
• More stable fundamental tone thanks to higher amplifier power
• Suitable for clear voices, precise mids and controlled speaker control
• Good basis for high-quality OEM upgrades without major installation effort

System integration

• Ideal for vehicles with factory radio
• Suitable for series speakers and retrofit systems
• Can be used for 2-way and coaxial speakers
• Suitable as a compact power center for front and rear systems
• Can be expanded with an additional mono amplifier for subwoofer
• Particularly easy to install thanks to ISO cable
• High level input facilitates integration without additional high-low converters

Connection and installation

• ISO connection cable included in delivery
• Install the power supply in accordance with the installation instructions
• Check speaker impedance before connection
• Only use bridged operation with suitable 4 ohm speakers
• Install the amplifier with sufficient ventilation
• Choose a stable and dry mounting surface
• Lay cables securely and protect them against chafing
• Keep signal lines and power lines separated as cleanly as possible
• Carefully adjust gain and filter settings to suit speakers and vehicle
• After installation, check all channels for correct polarity

Recommended applications

• Performance upgrade for series systems
• Plug & Play amplification via ISO connection
• Front system plus rear system
• Front system with bridged channels
• Front system with additional mono amplifier for subwoofer
• Unobtrusive retrofitting in leasing or everyday vehicles
• Compact car hi-fi systems that require little space
• Improved sound without major modifications

Scope of delivery

• 1 × Ground Zero GZRA 65.4-MICRO amplifier
• 1 × ISO connection cable
• Operating and installation instructions
• Mounting accessories depending on the scope of the set