Kicker 51KSS504 is a 5.25-inch KS-Series 2-way component speaker system designed for upgraded car audio front-stage or rear-stage installations. The separate-driver layout gives builders more placement flexibility than coaxial speakers when improving imaging, clarity, and factory-speaker output. Key Performance Features 5.25-inch 2-way component speaker system Separate-driver layout for improved placement flexibility 4 Ω nominal impedance Designed for upgraded car audio speaker systems Useful for front-stage or rear-stage component upgrades System Architecture Type: Component speaker system Size: 5.25-inch Nominal Impedance: 4 Ω Driver Layout: 5.25-inch woofers and separate tweeters Application: Car audio speaker upgrade Power Handling / Output RMS Power: Verify against Kicker specifications before amplifier matching Peak Power: Not provided Driver / Construction Separate woofer and high-frequency driver layout External crossover components where applicable Designed for improved placement and system tuning flexibility Installation Use Cases Factory speaker replacement where compatible Front-stage component speaker upgrades Custom door, dash, or rear-deck installations Technical Specifications Brand: Kicker Series: KS Model: 51KSS504 Product Type: Component speaker system Size: 5.25-inch Impedance: 4 Ω Identifiers & Packaging MPN: 51KSS504 UPC: 713034045328 Sold As: Pair Included Components: Component speaker system, crossovers where applicable, grilles where applicable, mounting hardware, 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 speaker selection, amplifier matching, and clean system setup