Hertz CP 1.2K Cento Power Mono 1200W Class D Car Amplifier

A mono Class D car amplifier delivering 1200W at 2 ohms from a compact aluminium diecast chassis, the Hertz CP 1.2K features Advanced D-Class (ADC) technology with 89% efficiency, variable phase control, USS input compatibility, Ready to Plug Molex connectivity, and a comprehensive onboard control set including adjustable low-pass filter, bass boost, and subsonic filter.

Product Overview

The Hertz CP 1.2K is a mono (1-channel) car amplifier from the Cento Power series, rated at 1200W total power. Built on Hertz's Advanced D-Class (ADC) technology, the CP 1.2K achieves 89% efficiency within a compact aluminium diecast chassis, making it suited to high-output subwoofer installations in space-constrained modern vehicles or factory amplifier locations. The bandwidth of 10Hz to 500Hz is optimised for subwoofer channel applications.

The amplifier accepts both Pre-In and Speaker-In inputs, with Pre-In sensitivity adjustable from 0.32 to 8VRMS and Speaker-In sensitivity from 1.6 to 40VRMS. The built-in Universal Speaker Simulator (USS) allows correct connection to head units with speaker load detection functions. Automatic Remote Turn-On/Off activates from OEM radio speaker outputs via the ART function at 1.5VDC. Ready to Plug Molex connections and provided plug-and-play cables simplify installation. The high-pass filtered pre-out (50-250Hz at 12dB/Oct) provides signal output for a full-range amplifier stage in multi-amplifier system configurations. The HRC 02 remote control (sold separately) allows subwoofer level adjustment from within the cabin. Variable phase control is included for fine-tuning subwoofer integration with the main speaker system. The CP 1.2K is compatible with power supply voltages from 9 to 18VDC for electric vehicle compatibility.

Output power at 1% THD: 650W x 1 at 1Ch/4 ohms and 1200W x 1 at 1Ch/2 ohms. Minimum load impedance is 2 ohms.

Features & Benefits

Advanced D-Class (ADC) Technology - 89% Efficiency: Hertz's ADC output stage delivers 89% power conversion efficiency, reducing heat generation and current draw while maintaining subwoofer channel performance at 1200W output levels. This enables the compact chassis form factor suited to modern vehicle installations.

1200W at 2 Ohms - 650W at 4 Ohms: The CP 1.2K delivers 1200W RMS at 2 ohms and 650W RMS at 4 ohms at 1% THD, providing high-output subwoofer drive power from a compact aluminium diecast chassis.

Variable Phase Control: The CP 1.2K includes variable phase control for fine-tuning subwoofer phase alignment relative to the main speakers, reducing cancellation at the crossover frequency for optimal bass integration.

Universal Speaker Simulator (USS) - SB Head Unit Compatibility: The integrated USS technology allows the CP 1.2K to correctly connect to modern head units with speaker load detection functions, ensuring compatibility without additional external components.

Ready to Plug Molex Connections: Durable long-term Molex connectors and provided plug-and-play cables simplify and accelerate installation, reducing wiring complexity and connection time.

Pre-In and Speaker-In Inputs with Adjustable Sensitivity: Both Pre-In (0.32-8VRMS) and Speaker-In (1.6-40VRMS) inputs are provided with adjustable sensitivity. Balanced input circuitry on both input types provides advanced noise rejection.

Automatic Remote Turn-On/Off (ART): The ART function enables automatic remote turn-on and turn-off activated by OEM radio speaker outputs at 1.5VDC, eliminating the need for a dedicated remote turn-on wire when installing with OEM source units.

High-Pass Filtered Pre-Out (50-250Hz at 12dB/Oct): The pre-out provides a high-pass filtered signal at 50-250Hz at 12dB/Oct, suited for routing signal to a separate full-range amplifier in multi-amplifier system configurations, with the subwoofer frequency range already removed.

Sub Low-Pass Filter (50-250Hz at 24dB/Oct): The subwoofer low-pass filter is adjustable from off to 50-250Hz at 24dB/Oct, providing steep crossover slope for clean subwoofer integration.

Subsonic High-Pass Filter (25Hz at 24dB/Oct): The switchable subsonic filter at 25Hz and 24dB/Oct protects the subwoofer from damaging infrasonic content below the operational range of the driver.

Bass Boost and Sub Remote Volume Control: A bass boost of 0-9dB at 50Hz is adjustable from the top panel. The sub remote volume control provides -20 to +6dB adjustment controllable via the HRC 02 remote (sold separately).

Electric Vehicle Compatible: The CP 1.2K operates across a power supply range of 9 to 18VDC, suitable for conventional 12V automotive, hybrid, and electric vehicle applications.

Compact Aluminium Diecast Chassis with LED Status Indicator: The compact aluminium diecast housing provides structural rigidity and thermal management, with a solid machined terminal block, removable top panel shielding the control panel, and an LED status indicator.

Technical Specs

Compatible With

The CP 1.2K is compatible with virtually any car audio source unit via its Pre-In and Speaker-In inputs with adjustable sensitivity. The USS technology ensures correct operation with head units featuring speaker load detection, including modern OEM and aftermarket SB head units. The ART function enables automatic remote turn-on from OEM radio speaker outputs. The HRC 02 remote control (sold separately) is compatible with the CP 1.2K for in-cabin subwoofer level adjustment. Operating voltage range of 9-18VDC provides compatibility with conventional 12V automotive, hybrid, and electric vehicle power systems.

Frequently Asked Questions

What is the difference between the CP 1.2K and the CP 1.700?

Both are mono Cento Power amplifiers sharing the same ADC technology, USS, ART, Molex connections, high-pass filtered pre-out, and compact chassis. The CP 1.2K delivers 1200W at 2 ohms versus 700W at 2 ohms for the CP 1.700, and uses a 2 x 35A fuse configuration versus 2 x 25A. The CP 1.700 has a higher damping factor (350 versus 140) and a higher S/N ratio (113dBA versus 102dBA). Both units weigh the same at 2.44kg. Choose the CP 1.2K for higher output subwoofer applications.

What is the variable phase control used for?

The variable phase control allows the subwoofer output phase to be adjusted relative to the main speaker channels, helping to align the bass and mid-bass timing at the crossover point. Correct phase alignment reduces cancellation between the subwoofer and the main speakers near the crossover frequency, resulting in smoother and more impactful bass response.

What does the high-pass filtered pre-out on the CP 1.2K provide?

The CP 1.2K's pre-out provides a high-pass filtered signal at 50-250Hz at 12dB/Oct rather than a full-range output. This is designed for multi-amplifier systems where the CP 1.2K handles the subwoofer channel and the pre-out feeds signal to a separate full-range amplifier for the main speakers, with the subwoofer frequency range already removed from the passed signal.

Does the CP 1.2K work in electric vehicles?

Yes. The CP 1.2K operates across a power supply range of 9 to 18VDC, covering the operating voltage ranges of conventional 12V automotive, hybrid, and electric vehicle systems.

What is the HRC 02 and is it included?

The HRC 02 is Hertz's optional remote control accessory that allows the subwoofer level on the CP 1.2K to be adjusted from -20 to +6dB from within the vehicle cabin after installation. The HRC 02 is not included with the CP 1.2K and must be purchased separately.