Small size, big upgrade — premium sound for compact spaces. Compact size, premium sound.
Kicker KS 4” speakers deliver smooth highs and clear sound in a space-saving design.

🔊 Premium Sound for Smaller Speaker Slots

Upgrade your vehicle’s sound system with Kicker 51KSC404 4” KS Coaxial Speakers, designed for clear, balanced audio in compact spaces.

Part of Kicker’s premium KS Series, these speakers provide smooth highs, natural sound, and improved clarity, even when powered by factory radios.

🔧 Key Features

✔ Compact 4” coaxial speaker design
✔ Polypropylene woofer for natural sound
✔ 1/2” silk dome tweeter for smooth highs
✔ High-sensitivity design (works with factory radios)
✔ Low-profile fit for tight installations
✔ Minimal tweeter protrusion

💎 Performance Benefits

👉 Delivers:

• Clear vocals

• Smooth high frequencies

• Balanced overall sound

👉 Perfect for:
💥 Dash speakers
💥 Rear fill speakers
💥 Small door speaker slots

🔊 Sound Performance

✔ Loud output even on factory systems
✔ Clean, distortion-free sound
✔ Better clarity than stock speakers

🚗 Perfect For

✔ Smaller vehicles
✔ Dash speaker upgrades
✔ Rear fill sound systems
✔ Replacing factory 4” speakers

🧱 Build Quality

✔ Polypropylene cone
✔ Silk dome tweeter (premium quality sound)
✔ Durable construction
✔ Built for long-term use

⚙️ Specifications

• Brand: Kicker

• Model: 51KSC404

• Speaker Size: 4”

• Type: Coaxial

• Series: KS (Premium)

📦 What’s Included

✔ 2 x Kicker 4” Speakers (Pair)
✔ Grilles included

⚠️ Important Information

❗ Check vehicle compatibility
❗ Ideal for smaller speaker locations
❗ Best performance with amplifier (optional)