Hertz MPX165-3 6.5" Two-Way Coaxial Speakers

The Hertz MPX165-3, also identified by Hertz as MPX 165.3 PRO, is a pair of 6.5-inch two-way coaxial car speakers designed for a direct, space-conscious upgrade over basic factory door speakers. Its coaxial layout places the tweeter at the center of the woofer, allowing both drivers to share a single mounting location. This makes it a practical choice where separate tweeter locations or external crossover mounting are not desired.

These speakers are intended for listeners building a balanced full-range system in doors, rear decks, or other factory-style speaker locations. With 100 watts continuous power handling per speaker and a 4-ohm impedance, they can be used with compatible aftermarket amplification or an appropriately matched head unit. Their 45 Hz to 21.5 kHz frequency response covers midbass, vocals, and high frequencies in one assembly.

The MPX165-3 uses a Tetolon soft-dome tweeter with a Center Tuning Duct and an acoustic lens. This arrangement is engineered to support controlled high-frequency output and improve off-axis response, which is useful when speakers are mounted low in vehicle doors. The concentric tweeter design also helps maintain a unified sound source from each speaker location.

For the low and midrange frequencies, Hertz uses a pressed-pulp cone reinforced with cotton fibers and a Boundary Free rubber surround. The 36 mm pure-copper woofer voice coil is wound on a polyamide former, while the woofer uses a high-density ferrite magnet motor. These materials support the speaker's intended combination of controlled midbass response and durable everyday operation.

The MPX165-3 fits naturally into a two-channel, four-channel, or front-and-rear speaker upgrade plan. Its integrated 3.5 kHz, 6 dB-per-octave crossover simplifies the coaxial speaker assembly by managing the transition to the tweeter internally. For a complete installation, verify vehicle-specific mounting clearance, factory speaker connector compatibility, and whether adapter brackets or wiring harnesses are needed.

Key Features

• Two-Way Coaxial Design: Combines woofer and tweeter in one 6.5-inch speaker location.
• 100W Continuous Power: Supports amplifier matching up to 100 watts RMS per speaker.
• Tetolon Dome Tweeter: Provides high-frequency reproduction through a 25 mm soft dome.
• Pressed-Pulp Cone: Cotton-fiber reinforcement supports a lightweight, rigid woofer cone.
• Integrated Crossover: Built-in 3.5 kHz crossover manages woofer-to-tweeter transition.
• Aluminum Alloy Basket: Open basket construction supports a low-profile installation design.

Design & Installation

The MPX165-3 combines a pressed-pulp and cotton-fiber woofer cone, Boundary Free rubber surround, Tetolon dome tweeter, high-density ferrite woofer magnet, and neodymium tweeter magnet. Its woofer uses a 36 mm pure-copper voice coil on a polyamide former, while the tweeter uses a 20 mm voice coil. The acoustically transparent aluminum alloy basket includes a rubber magnet cover intended to reduce unwanted vibration.

Confirm that the vehicle accepts a 165 mm (6.5-inch) speaker and check the available mounting depth, cutout, mounting-hole pattern, and window clearance before installation. The speakers use a 4-ohm load and are rated for 100 watts continuous power each, so amplifier output should be selected accordingly. Grilles are not included with standard MPX 165.3 PRO speaker packages; factory grilles may be used where suitable, while Hertz MPG 165.3 PRO grilles are available separately for compatible custom installations.