Kicker 51KSC504 KS Series 5.25" 13cm 2 Way Door Dash Coaxial Speakers 75w RMS
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The Kicker 51KSC504 is a pair of KS Series 5.25" (130 mm) 2-way coaxial speakers rated at 15–75W RMS, fitted with 0.75" silk-dome tweeters and a mounting depth under 52 mm — a straightforward upgrade for 5.25" door and dash locations.
Other KS Series sizes: 2.75" 51KSC2704, 3.5" 51KSC3504 and 4x6" 51KSC4604.
Key specifications
- Size: 5.25" (130 mm) 2-way coaxial, pair
- Tweeter: 0.75" (20 mm) silk-dome, neodymium
- Impedance: 4 ohms
- Recommended power: 15–75W RMS
- Sensitivity: 90 dB 1W/1m
- Frequency response: 45 Hz–21 kHz
- Mounting hole: 115 mm
- Mounting depth: 45 mm top, 52 mm bottom
Kicker KS Series 5.25" coaxial speakers
Potent performance
The KS Series is designed to play at high volume while retaining smoothness and detail. Internally dampened polypropylene cones and rubber surrounds deliver precise midrange and midbass, while the 0.75" silk-dome tweeters produce natural, detailed highs.
With a mounting depth under 52 mm and just 1 mm of tweeter protrusion, the 51KSC504 fits the vast majority of factory 5.25" locations. Recommended power is 15–75W RMS. If you need a 5.25" speaker at a lower price point, the Kicker 46CSC54 CS Series 5.25" is also available.
- High power handling: 15–75W RMS
- 0.75" silk-dome tweeters for smooth, detailed highs
- Polypropylene woofer cone with rubber surround
- Thin-mount design fits behind most factory grilles
- KSC5G grilles available separately for added protection and style
Explore the full range in Kicker KS Series Speakers.
Specification
| Sensitivity | [1W, 1m] 90 |
|---|---|
| Frequency Response | [Hz] 45-21k |
More specs
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What's Included
- KSC50 Speakers
- Speaker Wire
- Connectors
- Eight Self-tapping screws
- 8 Speed clips
- Owner's manual
Kicker
About the Kicker 51KSC504
From our tech experts at CEN
A 5.25 inch coaxial pair, with the tweeter mounted in the middle of the woofer, rated at 75w RMS.
Who it suits
Drivers replacing tired factory speakers who want a clear improvement without complication. Coaxials go where the originals were and sound better immediately.
Our tech experts advise
Speaker sizes, adapter rings and harnesses vary by vehicle, year and trim, so we confirm what your car takes before ordering rather than guessing. Treating the door skin matters as much as the speaker: a good driver in an untreated door is doing half a job. Installation is priced per vehicle, so get in touch with your make, model and year and we will confirm what it needs. See car audio installation.
Explore the full Kicker range at CEN, with fast UK dispatch and expert advice from our Nottingham team. Shop all Kicker
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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: What size hole does the Kicker 51KSC504 need?
A: The mounting hole diameter is 115 mm (4-1/2 inch). Mounting depth is 45 mm at the top and 52 mm at the bottom.
Q: Do the 51KSC504 speakers come with grilles?
A: Grilles are not included. Kicker KSC5G grilles are available separately.
Q: How much power do the 51KSC504 speakers need?
A: Kicker recommends 15 to 75 watts RMS.
