Infinity Reference REF307F 3.5" Coaxial Speakers

Infinity Reference REF307F 3.5" 2-way coaxial speakers fit behind factory grilles and deliver confident midbass with smooth high-end detail for a compact upgrade you can trust. The 3-ohm design combines with vehicle wiring to present a true 4-ohm load to most stereos, enabling safe power delivery from a wide range of head units.

Product highlights:

• 3-1/2" 2-way design: compact footprint that still delivers full-range sound for small doors or dashboards.
• Plus One+ polypropylene woofer cone: larger cone area for more air movement and punchy bass versus typical 3.5" drivers.
• Hi-roll rubber surround: durable edge treatment that helps maintain cone control over time and during dynamic motion.
• 1/2" textile balanced-dome tweeter: clear, smooth high frequencies with wide dispersion for better imaging.
• Inline high-pass filters included (196 Hz at 6 dB/oct): keeps lows out of the tweeter, preserving clarity and protecting the tweeter from overexcursion.
• True Four Ohm Impedance technology: the 3-ohm impedance pairs with car wiring to yield a 4-ohm load for compatibility with most factory or aftermarket stereos.
• Power handling: handles up to 25 watts RMS (75 watts peak power).
• Frequency response: 85–21,000 Hz for a broad audible range on a small speaker.
• Sensitivity: 91 dB at 2.83V for efficient system integration with typical head units.
• Top-mount depth: 1.418" fits shallow mounting depths in many vehicles.
• Grilles: grilles are not included; factory grilles should be suitable for most applications.
• Warranty: 1 year.
• What's in the box: Infinity Reference REF307F owner's manual; two 2-way speakers; adhesive-backed foam gasket strips; instruction manual; template on box.

Benefits: This pair is designed to replace small factory coaxials in doors or dash spaces, delivering clearer highs and more controlled midrange while maintaining compatibility with a wide range of head units thanks to its 4-ohm-compatible load. The 85 Hz lower limit helps extend bass realism for a 3.5" driver, and the 3-ohm impedance works with standard wiring to maximize power delivery without stressing your amp or head unit. Grilles aren’t required, but factory grilles work in most builds, and the included gasket strips aid a tight seal for best durability and imaging.