Infinity REF607FSL 6.5" Shallow-Mount Coaxial Speakers

The Infinity REF607FSL is a pair of 6.5-inch, 2-way coaxial car speakers designed for vehicle locations where mounting depth is limited. Its shallow 1-13/16-inch mounting depth helps make speaker replacement practical in many factory door and rear-deck locations. The integrated coaxial design places the woofer and tweeter in one assembly, simplifying an OEM-speaker upgrade.

These Reference Series speakers are intended for listeners who want clearer, more detailed sound from a factory or aftermarket audio system without moving to a separate component-speaker installation. They handle 55 watts RMS and 165 watts peak, with a 3-ohm nominal impedance. Their 93 dB sensitivity rating at 2.83V supports efficient performance with modest amplifier power.

The REF607FSL uses an edge-driven textile tweeter to reproduce high-frequency detail. Its Plus One woofer-cone architecture increases cone area relative to conventional designs in the same speaker class. This design supports responsive midrange reproduction and useful low-frequency output from a compact 6.5-inch speaker.

Infinity specifies a frequency response of 57 Hz to 21 kHz, covering the main vocal, instrument, and treble range expected from a full-range door speaker. The 2-way design uses a 6 kHz crossover point between its woofer and tweeter. It is a practical choice for replacing worn factory speakers or building a balanced front- or rear-speaker upgrade.

With its EZFit shallow-mount layout, the REF607FSL is designed to accommodate a variety of common speaker openings with the supplied adapter rings. The speaker has a 4-7/8-inch mounting cutout requirement and a 6-1/4-inch external diameter. Verify available depth, cutout diameter, mounting-hole pattern, window clearance, and factory connector requirements before installation.

Key Features

• Shallow-Mount Profile: A 1-13/16-inch mounting depth helps fit restricted locations.
• 6.5-Inch 2-Way Design: Integrates woofer and tweeter in each speaker.
• Plus One Cone: Increased cone area supports efficient midbass output.
• Textile Tweeter: Edge-driven design provides detailed high-frequency reproduction.
• 3-Ohm Impedance: Designed to work with factory or aftermarket systems.
• EZFit Adapter Rings: Included rings support installation across common openings.

Design & Installation

The REF607FSL combines a Plus One polypropylene woofer cone with a hi-roll rubber surround and an edge-driven textile tweeter. Its compact frame is engineered for shallow-mount applications while maintaining a 6.5-inch speaker format. The coaxial layout keeps the installation contained within a single speaker basket rather than requiring separate tweeter locations.

Use the included adapter rings, mounting screws, speed clips, and foam mounting tape as appropriate for the vehicle installation. Confirm the 4-7/8-inch cutout, 6-1/4-inch outer diameter, 1-13/16-inch mounting depth, and 2-1/8-inch total depth before fitting the speakers. A vehicle-specific wiring harness or mounting bracket may still be needed when retaining factory wiring or matching factory mounting points.