Kenwood KFC-1666S 6.5" 2-Way Coaxial Speakers

The Kenwood KFC-1666S is a pair of 6.5-inch, 2-way coaxial car speakers designed as a practical replacement or upgrade for compatible factory speaker locations. Its 4-ohm design and 30-watt RMS rating suit many standard car-audio systems. The speakers combine a woofer and tweeter in each assembly for full-range playback from a compact mounting footprint.

These speakers are intended for drivers replacing worn, damaged, or limited factory door or rear-deck speakers. A 90 dB sensitivity rating helps them work efficiently with compatible factory radios or aftermarket head units. Their 40 Hz to 22 kHz frequency response covers bass, midrange, and high-frequency content within a single coaxial design.

The KFC-1666S uses a 160 mm polypropylene woofer diaphragm with a cloth surround. This construction is paired with Kenwood's Sound Field Enhancer and enlarged magnet circuit design. A 25 mm balanced-dome tweeter handles upper-frequency detail above the woofer.

Each speaker is rated for 30 watts RMS input power and 300 watts peak input power. This makes the pair appropriate for modest-power speaker replacement systems and carefully matched amplification. For dependable operation, match the speakers with a compatible 4-ohm audio source and avoid exceeding their rated RMS power handling.

With a 4-7/8-inch cutout requirement and 1-11/16-inch mounting depth, the KFC-1666S can fit many vehicles that accept 6.5-inch speakers, subject to vehicle-specific clearance and mounting provisions. Grilles and installation hardware are supplied for custom or exposed installations. The speakers can be used as part of a basic factory-speaker refresh or alongside an upgraded receiver and properly matched amplifier.

Key Features

• 6.5-Inch Coaxial Design: Combines woofer and tweeter in each speaker assembly.
• 30W RMS Power Handling: Supports compatible factory or modest aftermarket power.
• 300W Peak Power: Handles short musical peaks within rated operating conditions.
• Polypropylene Woofer: Uses a PP diaphragm with a cloth surround.
• Balanced-Dome Tweeter: Provides dedicated high-frequency reproduction from a 1-inch driver.
• Included Installation Hardware: Includes grilles, screws, speed nuts, and speaker cords.

Design & Installation

The KFC-1666S features a silver polypropylene woofer diaphragm, cloth surround, ferrite woofer magnet, and silver balanced-dome tweeter with a neodymium magnet. Its shallow 5/16-inch tweeter height and 1-11/16-inch mounting depth are designed to support installation in a range of compatible locations. Grilles are included for added driver protection where appropriate.

Confirm your vehicle's speaker opening, mounting depth, mounting-hole pattern, and panel clearance before installation. The specified cutout diameter is 4-7/8 inches, while the speaker measures 6-5/16 inches across without its grille. Use the supplied screws, speed nuts, and speaker cords as applicable, and connect to a compatible 4-ohm channel with power matched to the 30-watt RMS rating.