Kicker 51KSC6904 KS Series 6x9" 2 Way Car Parcel Shelf Coaxial Speakers 150w RMS
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The Kicker 51KSC6904 is a pair of KS Series 6x9" 2-way coaxial speakers with 1" silk-dome tweeters, rated at 15–150W RMS, designed for parcel shelf or door installations.
This listing is the 2-way coaxial. The KS Series 6x9" is also available as a 3-way triaxial in the Kicker 51KSC69304, which adds a dedicated 1" midrange driver.
Key specifications
- Size: 6x9" (160 x 230 mm) 2-way coaxial
- Tweeter: 1" (25 mm) silk dome, neodymium magnet
- Recommended power: 15–150W RMS
- Impedance: 4 ohms
- Sensitivity: 92 dB (1W/1m)
- Frequency response: 30Hz–21kHz
- Mounting hole: 144 x 215 mm; top mount depth 75 mm
- Grilles: included
Potent performance
KS Series speakers are built for high-volume listening without losing detail or smoothness. Internally dampened polypropylene cones and rubber surrounds handle precise midrange and midbass, while silk-dome tweeters deliver natural, detailed highs.
With under 75 mm mounting depth and just 3 mm of tweeter protrusion, the KSC6904 fits in a wide range of vehicles. Power handling is 15–150W RMS.
- High power handling up to 150W RMS
- Silk-dome tweeters for smooth, detailed highs
- Polypropylene woofer cone with rubber surround
- Thin-mount design fits behind factory grilles
- Grilles included
Explore the full range in Kicker KS Series Speakers.
Specification
| Sensitivity | [1W, 1m] 92 |
|---|---|
| Frequency Response | [Hz] 30-21k |
More specs
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What's Included
- KSC6904 Speakers
- Speaker Wire
- Connectors
- Eight Self-tapping screws
- 8 Speed clips
- Owner's manual
Kicker
About the Kicker 51KSC6904
From our tech experts at CEN
The Kicker 51KSC6904 is a pair of KS Series 6x9" 2-way coaxial speakers rated at 15–150W RMS, designed for parcel shelf or door fitting. Each driver pairs a polypropylene woofer and rubber surround with a 1" silk-dome neodymium tweeter, covering 30Hz–21kHz at 92 dB sensitivity.
Who it suits
Drivers wanting a solid step up from factory speakers in 6x9" positions, particularly those running a modest amplifier or a head unit with decent output. The thin-mount design — 75mm top mount depth, 3mm tweeter protrusion — suits vehicles where space behind the grille is tight. For a budget-friendlier 6x9" option, see the Kicker 46CSC6934 CS Series 6x9" 3-way.
Our tech experts advise
Check your car's 6x9" opening against the 144 x 215mm cutout and 75mm mounting depth before ordering. Grilles, wire connectors, screws and speed clips are all included in the box. These run at 4 ohms and accept 15–150W RMS, suiting both factory head units and aftermarket amplifiers. Fitting is priced per vehicle — speak to our Nottingham team.
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Frequently Asked Questions
Q: Will these speakers fit my car?
A: Most car speakers are standard sizes, but mounting depth and fitting rings vary by vehicle. Check the size in the Specification tab against your vehicle, or contact CEN with your registration and we will confirm fitment and any adapters or fitting kits you need.
Q: Do I need an amplifier to run these speakers?
A: Not always. Most speakers will run from a standard head unit, but a dedicated amplifier lets them perform at their best, particularly for component sets and higher power handling models. The RMS figure in the Specification tab is the guide to how much clean power they can use.
Q: What is the difference between coaxial and component speakers?
A: Coaxial speakers combine the tweeter and woofer in one unit for a simple like-for-like upgrade. Component sets separate the tweeter and woofer with a crossover for better imaging and detail, and suit installs where sound quality is the priority.
Q: Do these come as a pair?
A: Unless stated otherwise, car speakers are sold in pairs. Check the product title and What's Included tab, which lists exactly what is in the box.
Q: Can CEN fit these speakers for me?
A: Yes. CEN offers professional installation from our Nottingham premises. Contact us to book an installation slot or ask for a fitting quote.
Q: How much power do the Kicker KSC6904 speakers need?
A: They work best with 15 to 150 watts RMS of recommended power at 4 ohms.
Q: What is the mounting depth of the Kicker 51KSC6904?
A: The top mount depth is 75 mm and the bottom mount depth is 81 mm. The mounting hole is 144 x 215 mm.
Q: What tweeter does the KSC6904 use?
A: A 1 inch (25 mm) silk-dome tweeter with a neodymium magnet, mounted coaxially on the polypropylene woofer.
