Hertz C165L 6.5" Extended-Response Woofers

The Hertz C165L is a 6.5-inch, 4-ohm car-audio woofer designed for component-speaker upgrades where stronger midbass and extended low-frequency response are desired. Sold as a pair, these woofers are suited to front-door, rear-door, or custom-panel installations with the appropriate mounting space. Their 50 Hz to 5 kHz operating range makes them a dedicated woofer solution rather than a full-range coaxial speaker.

This model is intended for listeners building or refreshing a component system and looking to replace factory wofer drivers with a more capable dedicated driver. Its non-pressed paper cone is water repellent and is engineered to provide a natural tonal character with controlled low frequencies. The 4-ohm nominal impedance also makes it compatible with many aftermarket amplifier channels and appropriately matched factory-system upgrades.

The C165L handles 80 watts continuous power and 240 watts peak power per woofer. A 25 mm voice coil on an aluminum former supports high-excursion operation, while the 6.1 mm mechanical excursion specification helps the driver accommodate demanding musical passages. With a 60 Hz resonant frequency and 13.66 L equivalent compliance volume, it is built for useful midbass performance in properly prepared vehicle door locations.

Its high-density flux ferrite magnet works with low-carbon polar plates to support motor control and reduce distortion at higher power levels. The compact three-spoke basket is paired with a rubber magnet cover intended to help damp unwanted vibrations. These construction choices support an installation focused on clean, controlled output instead of relying on a lightweight factory speaker structure.

The C165L can be used as the woofer section of a custom component system with separately selected tweeters and suitable crossover filtering. Its 6.5-inch nominal size, 142 mm cutout requirement, and 62.5 mm mounting depth should be checked against the vehicle's door or panel dimensions before purchase. For the strongest result, pair the woofers with solid mounting adapters, secure door treatment, and amplification or crossover settings appropriate for their rated operating range.

Key Features

• 6.5-Inch Woofer: Fits many common car-audio speaker locations with proper vehicle-specific mounting hardware.
• 80-Watt Continuous Handling: Supports appropriately matched aftermarket amplification.
• Water-Repellent Paper Cone: Provides a natural sound character and controlled low-frequency response.
• 4-Ohm Nominal Impedance: Works with many compatible car-audio amplifier channels.
• 25 mm Aluminum-Former Voice Coil: Supports high-excursion operation and power handling.
• Ferrite Magnet Motor: Uses a high-density flux ferrite magnet and low-carbon polar plates.

Design & Installation

The C165L uses a water-repellent non-pressed paper cone, high-density flux ferrite magnet, 25 mm voice coil, and a compact three-spoke basket. Its basket design is acoustically paired with a rubber magnet cover to help damp spurious vibrations. Each woofer weighs 0.973 kg (2.15 lb) and has a nominal outside diameter of 165 mm.

Confirm the available mounting space before installation: the woofer requires a 142 mm cutout and 62.5 mm mounting depth, with 71 mm overall depth. Use the C165L as a dedicated woofer in a properly filtered component system, and match the amplifier channel to its 4-ohm nominal impedance and 80-watt continuous power rating. Hertz lists the CG 165 grille as an optional accessory.