KICKER 51KSC6904 Coaxial Speaker System, 2-Way Design, One

KICKER 51KSC6904 Coaxial Speaker System, 2-Way Design, One (1) Pair, 6″ x 9″ (160mm x 230mm) Polypropylene Woofer/Midrange, 1″ (25mm) Silk-Dome Tweeters, 150 Watts RMS, 300 Watts Peak
- The 51KSC6904 2-Way Coaxial Speaker System mounts effortlessly in select domestic and import models, thanks to an ultra-thin speaker design and integrated crossover. The coaxial system combines easy installation and acoustic perfection to achieve Concert-Level realism and volume.
- 6" x 9" (160mm x 230mm) Polypropolene Woofer/Midrange with tough Rubber Surround fits select GM, Ford, Chrysler, Jeep, Dodge and Imports.
- 1" (25mm) Neodymium Silk-Dome tweeters coaxially mounted for a smooth sound. Tweeter protrusion of 1/16" (1.6mm) above the speaker frame.
- Thin-mount design easily fits behind factory grilles; 2-15/16" (75mm) mounting depth. One (1) pair of grilles and hardware included.
- Recommended Amplifier Power: 15 – 150 Watts RMS | Peak Power Handling: 300 Watts | Sensitivity: 92dB 1W/1M | Frequency Response: 30 Hz – 21 kHz | Nominal Impedance: 4-Ohms
SKU: | B0CRLH27SK |
Weight: | 8.23 pounds |
Dimensions: | 1.88 x 3.07 x 3.07 inches |
Model: | 51KSC6904 |
Pack Quantity: | 2 |
Manufacture: | KICKER |
Quantity: | 2 |
Product Description
Previous pageKS Speakers
KICKER KS-Series Speakers let you play at concert-like volume, yet maintain the smoothness and subtlety to please even the most selective ear.
KS Speakers
The high-performance woofers utilize internally dampened polypropylene cones and tough rubber surrounds for outstanding midrange detail and pounding bass!


Convert and Customize
Experience your music as a component system with separate tweeters, or as a high-end coaxial system. In addition to the coaxial options, you can surface mount the tweeter, angle it in a custom direction, or use the articulating tweeter pod to get perfect imaging and soundstage.
Coaxial Comparison
![]() 51KSC2704 | ![]() 51KSC3504 | ![]() 51KSC404 | ![]() 51KSC4604 | ![]() 51KSC41004 | ![]() 51KSC504 | |
Customer Reviews | 4.9 out of 5 stars 12 | 4.9 out of 5 stars 12 | 4.9 out of 5 stars 12 | 4.9 out of 5 stars 12 | 4.9 out of 5 stars 12 | 4.9 out of 5 stars 12 |
Price | $59.99 | $79.99 | $99.99 | $99.99 | $129.99 | $129.99 |
Speaker Design | Midrange | 2-Way | 2-Way | 2-Way | 2-Way | 2-Way |
Midrange | 2-¾ | — | — | — | — | — |
Woofer | — | 3-½ | 4 | 4×6 | 4×10 | 5-1/4 |
Tweeter | — | ½ | ½ | ½ | ½ | ¾ |
Rated Impedance | 4 | 4 | 4 | 4 | 4 | 4 |
Recommended Amplifier Power | 15-50 | 15-50 | 15-75 | 15-75 | 15-75 | 15-75 |
Sensitivity | 85 | 88 | 88 | 88 | 88 | 90 |
Frequency Response | 300-20k | 80-20k | 60-20k | 50-20k | 45-20k | 45-21k |
Mounting Hole Diameter | 3-1⁄16 | 3-1⁄16 | 3-11⁄16, 94 | 4×5-5⁄16 | 3-7/8 x 9-3/8 | 4-1/2 |
Top Mount Depth | 1-5⁄8 | 1-5⁄8 | 1-13⁄16, 46 | 1-11⁄16 | 2-3/8 | 1-3/4 |
Bottom Mount Depth | 1-7⁄8 | 1-7⁄8 | 2-1⁄16, 51 | 2 | 2-13/16 | 2 |
Coaxial Comparison
![]() 51KSC6504 | ![]() 51KSC6704 | ![]() 51KSC6804 | ![]() 51KSC6904 | ![]() 51KSC69304 | |
Customer Reviews | 4.9 out of 5 stars 12 | 4.9 out of 5 stars 12 | 4.9 out of 5 stars 12 | 4.9 out of 5 stars 12 | 4.9 out of 5 stars 12 |
Price | $129.99 | $129.99 | $129.99 | $159.99 | $189.99 |
Speaker Design | 2-Way | 2-Way | 2-Way | 2-Way | 3-Way |
Midrange | — | — | — | — | 1 |
Woofer | 6-1/2 | 6-3/4 | 6 x 8 | 6 x 9 | 6 x 9 |
Tweeter | ¾ | ¾ | ¾ | 1, 25 | 3/4, 20 |
Rated Impedance | 4 | 4 | 4 | 4 | 4 |
Recommended Amplifier Power | 15-100 | 15-100 | 15-75 | 15-150 | 15-150 |
Sensitivity | 90 | 90 | 90 | 92 | 92 |
Frequency Response | 43-21k | 40-21k | 45-21k | 30-21k | 30-21k |
Mounting Hole Diameter | 4-13/16 | 5-9/16 | 5 x 7-3/16 | 5-11/16 x 8-7/16 | 5-11/16 x 8-7/16 |
Top Mount Depth | 1-13/16 | 1-13/16 | 2-1/4 | 2-15/16 | 2 15/16 |
Bottom Mount Depth | 2-3/16 | 2 | 2-5/8 | 3-3/16 | 3-3/16 |