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KICKER

KICKER 51KSC6504 KS-Series 6.5" Coaxial Speakers with .75" tweeters, 4-Ohm, Pair

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Availability: Only 3 left in stock, order soon!
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Arrives Friday, Jul 3
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Model: 51KSC6504


Features

  • KICKER KS-Series Speakers let you play at concert-like volume, yet maintain the smoothness and subtlety to please even the most selective ear.
  • The high-performance woofers utilize internally dampened polypropylene cones and tough rubber surrounds for outstanding midrange detail and pounding bass!
  • Completely redesigned with new cones, voice coils and crossovers, KS-Series Coaxial Speakers are a serious upgrade from your factory sound.
  • Featuring zero (or minimal) tweeter protrusion, you get a perfect fit in almost every vehicle on the road today, without modifications.

Brand: KICKER


Speaker Maximum Output Power: 200 Watts


Frequency Response: 21000 Hz


Connectivity Technology: Wired


Audio Output Mode: Stereo


Audio Output Mode: Stereo


Mounting Type: Flush Mount


Enclosure Material: Polypropylene, Rubber, Silk


Speaker Type: Coaxial


Additional Features: Hi Res Audio


Antenna Location: Automotive


Color: Black


Is Waterproof: FALSE


Warranty Type: Limited


Control Method: Touch


Speaker Size: 6.5 Inches


Woofer Diameter: 6.5 Inches


Tweeter Diameter: 0.75 Inches


Specific Uses For Product: PA


MP3 player: No


Unit Count: 1.0 Count


Item Dimensions D x W x H: 3.4"D x 9"W x 18"H


Item Weight: 5.7 Pounds


Compatible Devices: Car Audio System


Compatible with Vehicle Type: & SUVs, Select Cars, Truck


Power Source: Corded Electric


Brand: KICKER


Model Number: 51KSC6504


Model Name: 51KSC6504


Built-In Media: 51KSC6504


Warranty Description: 1-Year Manufacturer Warranty


Number of Items: 1


UPC: 713034058410


Manufacturer: Kicker


Speaker Maximum Output Power: 200 Watts


Frequency Response: 21000 Hz


Number of Audio Channels: 2.0


Impedance: 4 Ohms


Connectivity Technology: Wired


Wireless Technology: No Wireless Communication Technology


Subwoofer Connectivity Technology: Wired


Connectivity Protocol: Coaxial


Audio Driver Type: Dynamic Driver


Audio Driver Size: 6.5 Inches


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, Jul 3

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Similar Products

Top Amazon Reviews

    • Fit perfect in my 1998 GMC Yukon
Model: 51KSC41004
Took me awhile to find out who sold this size speaker. Kinda an odd size nowadays, but I wanted the best quality. And these are one of the best speaker brands in today’s market. You won’t be disappointed at all. Very easy to install, professional quality and excellent sound. Definitely worth the money. ... show more
Reviewed in the United States on April 25, 2026 by Ohio850
    • Great bolt in replacement speakers
Model: 51KSC404
The 4" factory speakers in my LC76 Land Cruiser were murky and lacked bass. These KIckers bolted in directly. They include 4 mounting tabs. My installation only required two and the remaining two were easily removed with pliers. The sound is noticeably more clear. I am getting more volume. While bass remains limited as is to be expected from a 4" speaker, it is more controlled and crisp. Very oleased with the swap. Recommended. ... show more
Reviewed in the United States on March 13, 2026 by sjp3003
    • Good product. Reasonable price. Easy install
Model: 51KSC4604
Work great. Easy install. Reasonable price
Reviewed in the United States on June 1, 2026 by Mike
    • great replacement.
Model: 51KSC6504
Used these to replace the factory speakers in my 26 Bronco. Fit perfect and night and day difference in sound. No amp need, but I would recommend. Big difference in max volume level.
Reviewed in the United States on May 9, 2026 by Amazon Customer
    • This rock and pound! A trusty solution well made This rock and pound! A trusty solution well made
Model: 51KSC2704
Review Image by Abe of all Trades Master of fun
Review Image by Abe of all Trades Master of fun
Review Image by Abe of all Trades Master of fun
Review Image by Abe of all Trades Master of fun
Review Image by Abe of all Trades Master of fun
Review Image by Abe of all Trades Master of fun
Review Image by Abe of all Trades Master of fun
Review Image by Abe of all Trades Master of fun
I would give these particular KS kicker speakers 5 stars but it arrived with 2 100 microfarad capacitors that are not clear for the user to connect to the speaker and or if you should use them considering what they actually do. In my case I didn’t use them because of the amp used is rated for 4ohm and a crossover that is able to control its received frequency range. If you wanted to wire them in parallel to a single channel, then you would need to use these capacitors inline on the positive lead to each speaker thus making it operate at a 2ohm load. The mounting is perfect for many vehicles. Comes with 2 GM/Mopar brackets 2 Chrysler/Jeep brackets 2 Toyota/Subaru brackets Two 11" Lengths of speaker wire (tinned wire on one end and quick slides on the other), very important for the long run and if you live where there is any weather. Two 100 microfarad capacitors not necessary for me to use. 4 Red plastic wire caps- good quality but lacking my favorite a conductive cream called Ox-guard, when using be sure to not short out two terminals as it increases conductivity but works well in this case of crimping wires. I use it almost daily. Four 1-1/8" Screws, threw in the pile of unused screws. Quick-Start guide (English/ Spanish/ German/ French) didn’t fully help.. hope this helps and you try these speakers. I have all kinds of different speakers and so many vehicles that I’ve been building for the last 30+ years and I gotta say kicker is a brand I always come back to. For this particular client of mine they have blown the competitors away, I literally just finished one of the best soundings systems that didn’t break the bank using 11 KS speakers in a 2022 Chevy Equinox. Brackets were perfect i just reused the hardware from the vehicle. For mounting always consider considering sound deadening mat and or sound baffles and acoustic phone. It’s a cheap way to really improve the quality of your sound. ... show more
Reviewed in the United States on April 16, 2025 Reviewed in the United States on April 16, 2025 by Abe of all Trades Master of fun
    • Great speakers! Love the paper cones! Great speakers! Love the paper cones!
Model: 51KSC2704
Review Image by Brady Harston
Review Image by Brady Harston
This is a fantastic speaker. I have a 2025 Subaru Crosstrek Premium, and I've built and tuned my entire sound system from scratch. These replaced my Kicker CS 3.5 2 way coax, because I was tired of the phase issues of having a tweeter mounted on the pole of the midrange woofer 3.5. The plastic and PEI of the CS also just had a very fatiguing metallic ring. These new Kickers were a great compromise, because I didn't want a coaxial in the dash, and I also wanted something more capable than just a plain midrange. I run these at 30W RMS, and they run alongside my doors, which are Hertz Cento 165 L, which also have paper cones. I used my DSP to adjust the EQ on these to be more warm and less fatiguing, and wow, these are amazing. I boosted some of the highs to give a bit more shimmer before they have a hard roll off. I don't know if I would enjoy these if I didn't have a DSP, so that's something to keep in mind for potential buyers. I personally prefer a warm sound signature but if you like bright, I'm sure you'll love them. I have them band passed from 400Hz-20kHz, using LR24 slopes on both top and bottom. I love these speakers, the detail is incredible. It's no Hertz Mille or Morel Piccolos, but for a budget to intermediate, these are a killer deal. I couldn't be happier. About the compatibility, they aren't a perfect fit in my dash, I had to drill a new hole (which was a pain because of the tiny space between the dash and windshield) and screw it in using a small crescent wrench, because of the difficulty of using a bit by hand. Now that I've done it once, I can use a small phillips tip bit and do it by hand. So worth it. ... show more
Reviewed in the United States on May 25, 2026 Reviewed in the United States on May 25, 2026 by Brady Harston
    • Fits PERFECTLY ON Ram 2500 Fits PERFECTLY ON Ram 2500
Model: 51KSC3504
Review Image by Omar
Review Image by Omar
Review Image by Omar
Crisp clear sounds! Definitely need to upgrade my doors speaks next. Louder than what I expected ! I love the brand!
Reviewed in the United States on May 17, 2026 Reviewed in the United States on May 17, 2026 by Omar
    • They are bad ass speakers.
Model: 51KSC3504
One hundred watts three and a half sound amazing. I also bought 6.5's and 6x9 all KS Series. I installed it in my jeep gladiator i bought the plug and play for my factory Alpine premium sound with a ten inch woofer and amp.And it sounds amazing
Reviewed in the United States on May 8, 2026 by Amazon Customer

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