Hertz CP 1.700 Mono Class D Car Amplifier

The Hertz CP 1.700 is a mono Class D car amplifier designed to power a subwoofer system with controlled, efficient output. It delivers 400 watts RMS at 4 ohms or 700 watts RMS at 2 ohms, giving installers a practical choice for single-subwoofer and multi-subwoofer configurations. Its mono layout is purpose-built for low-frequency amplification rather than full-range speaker channels.

This amplifier suits listeners building a focused bass upgrade while retaining a factory or aftermarket source unit. Pre-In and Speaker-In connections allow it to integrate with systems that provide either low-level RCA signals or speaker-level outputs. The built-in ART automatic turn-on function can activate the amplifier from compatible BTL speaker-level outputs without a separate remote turn-on lead.

The CP 1.700 combines an ADC Advanced D-Class output stage with 89% efficiency, helping it deliver substantial power from a compact footprint. Its specified bandwidth extends from 10 Hz to 500 Hz, while a 24 dB/octave low-pass filter and selectable 25 Hz subsonic filter support subwoofer-focused tuning. A damping factor of 350 at 1 kHz and a 113 dBA A-weighted signal-to-noise ratio support clean, controlled operation.

System tuning is handled through adjustable input sensitivity, low-pass filtering, bass boost, subsonic filtering, and variable phase control. The bass boost operates at 50 Hz with a 0 to 9 dB adjustment range, while the phase control provides adjustment from 0 to 180 degrees. These controls help match the amplifier and subwoofer to the vehicle, enclosure, and front-speaker system.

For expansion, the amplifier includes a high-pass pre-out adjustable from 50 to 250 Hz at 12 dB per octave. This allows a signal to be passed to another amplifier in a multi-amplifier system. The optional Hertz HRC 02 remote control can adjust subwoofer level from -20 to +6 dB, providing convenient level changes from the driver’s seat.

Key Features

• Mono Class D Design: Dedicated low-frequency amplification in a compact, efficient format.
• 700W RMS at 2 Ohms: Supplies substantial power for a compatible subwoofer load.
• Pre-In and Speaker-In: Supports aftermarket and factory-source integration options.
• Adjustable Low-Pass Filter: Helps direct appropriate bass frequencies to the subwoofer.
• Variable Phase Control: Allows 0 to 180 degree subwoofer phase adjustment.
• Optional HRC 02 Control: Adds driver-accessible subwoofer level adjustment when installed.

Design & Installation

The CP 1.700 uses a compact, vented enclosure with an integrated mounting structure and top-accessible adjustment controls. Hertz specifies external dimensions of 205 x 155 x 48 mm, with a 2.44 kg amplifier weight. The compact Cento Power design is intended for installation in increasingly limited vehicle spaces, including a factory-amplifier location where suitable.

Install the CP 1.700 only with a subwoofer system presenting no less than a 2-ohm mono load. Use either the Pre-In or Speaker-In connection, not both, then set input sensitivity and crossover controls to suit the connected source unit and subwoofer enclosure. The supplied hardware includes speaker, remote, and pre-in/pre-out connection cables, while the HRC 02 level controller is optional.