Kicker 51KSC3504 is a KS Series 3.5-inch 2-way coaxial speaker pair designed for compact factory speaker locations and full-range vehicle audio upgrades. Key Performance Features 3.5-inch 2-way coaxial speaker pair 15–50 W RMS recommended amplifier power Silk-dome tweeters for smooth high-frequency output Polypropylene woofer cones with rubber surrounds Thin tweeter protrusion for factory grille clearance System Architecture Type: 2-way coaxial speaker pair Application: Compact factory speaker replacement Nominal Impedance: 4 Ω Recommended Amplifier Power: 15–50 W RMS Power Handling / Output Recommended Power: 15–50 W RMS Driver / Construction Polypropylene woofer cone Rubber woofer surround 0.5-inch silk-dome tweeter Neodymium tweeter magnet No grilles included Installation Use Cases Dash speaker replacement Compact factory speaker locations Amplified or radio-powered daily-driver speaker upgrades Technical Specifications Brand: Kicker Series: KS Series Model: 51KSC3504 Speaker Design: 2-way coaxial Woofer Size: 3.5 in. (89 mm) Tweeter Size: 0.5 in. (13 mm) Impedance: 4 Ω Sensitivity: 88 dB Frequency Response: 80 Hz – 20 kHz Top Mount Depth: 1-5/8 in. (41.5 mm) Identifiers & Packaging MPN: 51KSC3504 UPC: 713034058397 Sold As: Pair (2 speakers) Included Components: Two coaxial speakers, documentation Why Buy From MCOR Automotive Authorized retailer for the brands we sell Specialists in car audio, marine audio, and vehicle-specific integration Expert support for product selection, amplifier matching, and clean system setup