Hertz CPX690 6x9 3-Way Coaxial Speakers with Grilles

The Hertz CPX690 is a 6x9-inch three-way coaxial speaker designed for vehicle audio upgrades where a full-range rear-deck or horizontal mounting solution is needed. Its integrated woofer, tweeter, and supertweeter combine multiple frequency ranges in one speaker assembly. This makes it a practical option for replacing factory 6x9 speakers while retaining a straightforward coaxial layout.

With 120 watts continuous power handling and a 4-ohm nominal impedance, the CPX690 is suited to systems using an aftermarket head unit or appropriately matched amplifier channels. Its 35 Hz to 24 kHz frequency-response specification covers bass, midrange, and high-frequency reproduction within one coaxial design. The 94 dB SPL specification supports efficient output from a properly configured car-audio system.

The woofer uses a water-repellent pressed-paper cone with FEM-optimized geometry, paired with a wide rubber suspension. This construction is intended to balance rigidity, damping, and excursion in automotive use. A ferrite woofer magnet and low-carbon polar plates support the motor system.

For upper frequencies, the CPX690 uses a 32 mm Tetolon-dome tweeter and a 24 mm Tetolon-dome supertweeter, both with neodymium magnets. The speaker's integrated crossover is specified at 4 kHz and 10 kHz with 6 dB-per-octave slopes. Its faceplate geometry is optimized for off-axis response, an important consideration in horizontal rear-deck installations.

The CPX690 fits well as part of a balanced upgrade that includes compatible front speakers, a source unit, and amplification matched to its 4-ohm load and 120-watt continuous rating. A metal-finished basket, rubber magnet cover, and radial ventilation are incorporated into the design. Protective grilles are supplied for installations where the speaker face is exposed.

Key Features

• Three-Way Coaxial Design: Integrates woofer, tweeter, and supertweeter in each speaker.
• 120W Continuous Handling: Supports properly matched aftermarket amplification.
• Water-Repellent Paper Cone: Helps provide controlled cone behavior in automotive environments.
• Tetolon Dome Drivers: Tweeter and supertweeter cover upper-frequency reproduction.
• Integrated Crossover: Directs frequencies between the three driver sections.
• Included Protective Grilles: Add protection for exposed speaker installations.

Design & Installation

The CPX690 uses a metal-finished basket with radial ventilation and an anti-vibration rubber magnet cover. Its woofer combines a ferrite magnet, water-repellent pressed-paper cone, and wide rubber suspension. The supplied grilles use a high-resistance ABS structure with metallic finish and protective metal mesh.

Confirm that the vehicle accepts 6x9-inch speakers and compare available space with the manufacturer's published dimensions before installation. Connect each speaker to a compatible 4-ohm channel, observe correct polarity, and match amplifier output responsibly to the 120-watt continuous power rating. The design is particularly suited to horizontal and rear-deck mounting locations where off-axis high-frequency response matters.