KICKER 51KSC404 front view coaxial speaker for enhanced midrange clarity
KICKER KS-Series 4-inch coaxial driver side profile for compact vehicle fit
KICKER 51KSC404 cone close-up highlighting dampened polypropylene construction
KICKER KS-Series tweeter mount for crisp, detailed highs
KICKER 51KSC404 voice coil close-up indicating reliable power handling
KICKER KS-Series rubber surround supports smooth bass response
KICKER KS-Series mounting kit for easy installation in most cars
KICKER KS-Series crossover design for balanced woofer-tweeter output
KICKER KS-Series woofer assembly with integrated coaxial layout

KICKER

KICKER KS-Series 4-Inch Coaxial Speakers (51KSC404) – 4-Ohm Pair with .5-Inch Tweeters

Free U.S. shipping and free 30-day returns. Check the compatible models in the description below.

$138.61

In stock. Ships free, usually within 1–4 business days.

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Check the listed compatible models and specs before you order. Questions? Email us.

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Free tracked shipping on every order. Most orders arrive within 3–8 business days.

Free 30-day returns

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Return eligible items within 30 days of delivery for a full refund. We email you a prepaid return label.

Peak-demand shipping delays

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During high demand, deliveries may experience short carrier delays. Tracking updates remain active for every order.

Email support

Questions about fit or an order? Email nexoltic@gmail.com. We reply on business days (Mon–Fri).

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Product details

Elevate your car audio with the KICKER KS-Series 51KSC404 4 inch coaxial speakers

Designed to deliver dynamic sound in smaller spaces, these coaxial speakers pair a compact woofer with a precise tweeter to fill the cabin with clear highs and solid midrange. The internally damped polypropylene cone and tough rubber surround help maintain bass presence without harshness, while a redesigned voice coil and crossovers harmonize the drivers for smoother transitions. This setup offers a balanced, engaging listening experience without requiring a complete system overhaul.

Real-world listening experience

  • Vivid highs and well defined midrange that stay musical at higher volumes
  • Noticeable bass presence without distortion when you push the volume
  • Balanced sound across rock, pop, hip hop, and acoustic tracks

Installation is simplified by a compact design that minimizes tweeter protrusion, helping these speakers fit in a wide range of vehicles with little to no modification. The 4-ohm impedance lends itself to flexible pairing with compatible amps and head units, unlocking more potential from your existing setup.

Why KS-Series stands out

  • New cones, voice coils, and crossovers deliver a refined upgrade over stock systems
  • Durable components like dampened polypropylene and rubber surrounds support daily driving needs
  • Close integration with factory or aftermarket upgrades keeps the sound clean and controlled

Whether you want a crisp upgrade for daily commutes or a more immersive listening experience on weekend trips, KS-Series coaxials offer a credible step up in car audio realism without big compromises.

FAQ

Q: What makes the KICKER 51KSC404 KS-Series coaxial speakers a good upgrade?

A: A redesigned 4-inch woofer with a .5 inch tweeter and new crossovers offer clearer highs and stronger midrange without adding bulk.

Q: Will these speakers fit in my car without modifications?

A: Yes, the design features minimal tweeter protrusion to fit more vehicles with little or no trimming.

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