Infinity Reference REF407F 4" 2-way car speakers are a high-efficiency upgrade designed to fit behind factory grilles or panels in most applications, delivering punchy midbass and smooth highs. They perform best when powered by an external amplifier but remain compatible with factory or aftermarket stereos. Plus One+ polypropylene woofer cone: Oversized cone with a hi-roll rubber surround moves more air for louder, more impactful bass from a compact 4" driver. 1/2" textile balanced-dome tweeter: Produces clear, smooth high frequencies for a refined top end without harshness. True Four Ohm Impedance technology: The speaker's 3-ohm impedance combines with vehicle wiring to present a 4-ohm load, ensuring compatibility with virtually all factory and aftermarket radios. Power handling: Rated to handle up to 35W RMS (105W peak), offering solid performance with stock head units and headroom when paired with an amplifier. Frequency response: 75 Hz – 21,000 Hz, enabling reproduction from deep bass fundamentals up into the upper treble for a fuller sound. Sensitivity: 92 dB @ 2.83V, meaning more output with less power and easier integration with common car stereos. Top-mount depth: 1.875", a compact depth that helps with fitment behind factory panels in many vehicles. Grilles: Grilles are not included, so verify compatibility with your factory grille or panel. Warranty: 1 year. What’s in the box: Infinity Reference REF407F owner's manual; Two 2-way speakers; Adhesive backed foam gasket strips; Instruction manual; Template on box. Benefits: In a real-car install, this pair provides noticeably stronger midbass from a small footprint while delivering refined highs through the textile dome tweeters. The 3-ohm/4-ohm impedance design ensures broad compatibility with most radios, so you can use either a factory head unit or add an external amplifier for improved dynamics. With a 75 Hz lower limit and 92 dB sensitivity, the REF407Fs offer usable bass extension and higher efficiency, making them a practical upgrade for tighter doors or panels where space is limited and sound quality matters.
