Skip to content
Free shipping with delivery in 2-4 days See details
Free shipping with delivery in 2-4 days See details



Kicker KS Series 6"x9" 4 Ohm 125 Watts Component Speaker System 51KSS6904

SKU KI-51KSS6904
Save 32% Save 32%
Original price $312.99
Original price $312.99 - Original price $312.99
Original price $312.99
Current price $212.96
$212.96 - $212.96
Current price $212.96

Free Gifts when added to Cart

The more you spend, the greater selection of free gifts you'll have at your fingertips when selecting items in your shopping cart!

Spend More, Save More

Big Jeff loves his customers!!!
  • Spend $250, Save 3% *Must purchase 2 items to qualify
  • Spend $500, Save 5% *Must purchase 3 items to qualify
  • Spend $1000, Save 7% *Must purchase 4 items to qualify

*Does not apply to: AudioControl, Sundown, XS power or Kicker products*

*Does not stack with other promotional sales*

  • Concert-Like Volume - Elevate your car audio with KICKER KS-Series 6x9" Component Car Speakers for a concert-like experience.
  • Superior Sound Quality - Silk-dome tweeters and internally dampened polypropylene cones deliver smooth midrange, bass, and detailed highs.
  • Versatile Design Options - Experience music as a component system or high-end coaxial system with adjustable 25mm silk-dome tweeters.
  • Powerful Performance - Ideal for 15 to 150 watts of recommended power, ensuring high power handling for exceptional audio.
  • Easy Installation - Thin-mount design fits effortlessly behind factory grilles, and four tweeter mounting options provide flexibility.

Kicker KS Series 6"x9" 4 Ohm 125 Watts Component Speaker System 51KSS6904

This Listing Includes:

  • (2) 6x9" Speakers

  • (2) 1" Tweeters

  • (1) Set of Flush/Pod/Angular Tweeter Mounts

  • (2) Crossovers

  • (2) Speaker Grilles

Immerse yourself in the ultimate car audio experience with the KICKER KS-Series 6x9" Component Car Speakers. Designed to deliver a concert-like volume, these speakers maintain smoothness and subtlety, pleasing even the most selective ears. The combination of internally dampened polypropylene cones and durable rubber surrounds ensures precise midrange and bass, while high-quality silk-dome tweeters deliver natural, detailed highs. Transform your music experience by choosing between a component system or high-end coaxial system, thanks to the adjustable 25mm silk-dome tweeters. The removal of the bullet-style phase plug and the addition of a special adapter allow tweeters to rotate and tilt, providing superior off-axis performance and multiple system design options. With a power handling capacity of 15 to 150 watts, these speakers are perfect for those seeking powerful and high-quality audio. Installation is a breeze with the thin-mount design, and the inclusion of four tweeter mounting options adds versatility to your setup.


  • Thin-Mount Design

  • Articulating tweeter pod included

  • Smaller crossover for easier mounting

  • Grilles included

Technical Specifications:

  • Woofer Size: 6x9 inches

  • Tweeter Size: 1 inch

  • Rated Impedance: 4 Ohms

  • Recommended Amplifier Power: 15-150 Watts RMS

  • Sensitivity: 92 dB

  • Frequency Response: 35Hz - 21kHz

  • High Pass: 12 dB at 4000 Hz

  • Low Pass: None

  • High-Frequency Output Attenuation: 0, 4.5, 9 dB


  • Woofer Mounting Hole Diameter: 5.625x8.4375 inches

  • Woofer Top Mount Depth: 2.9375 inches

  • Woofer Bottom Mount Depth: 3.1875 inches

  • Flush Mount Tweeter Hole Diameter: 1.75 inches

  • Flush Mount Tweeter Depth: 0.6875 inches

Payment Information


We accept PayPal for all ebay orders. You can use your credit through PayPal as all major credit card are accepted by PayPal.

We accept PayPal for all international orders, your address must be verified with PayPal.

We are not responsible for any custom duties or brokerage fees that may apply for all international orders.

When you click on the Buy it Now button you are entering into a
contract whereby you agree to purchasing the item at the price listed.

If you want to ship your item to an alternate address please add
that address on your PayPal account and use the address as the default
or confirmed address to pay us through PayPal

With Free Same Business Day Shipping we work to get you your order Fast. 


All orders over $500 will require a signature for delivery.

All pre-selected shipping rates and methods are for customers with a
valid residential or commercial address within the Contiguous 48 United
States (PO Boxes address may require additional charges).

P.O. Boxes, APO/FPO addresses, Alaska, Hawaii, Puerto Rico, Guam,
U.S. Virgin Islands, Northern Mariana Islands, American Samoa, Canada,
and other countries may require additional shipping fees. Please contact
a member of our team for detailed shipping charges.

Shipping is available only to PayPal verified addresses. When making
payment please confirm your address has been verified with PayPal. Once
payment is made shipping address can not be changed/altered. Payments
made using an unverified PayPal address will be refunded and order will
be canceled.

We will not accept request to change shipping address once payment
has been made. Please confirm your shipping address is up-to-date and

Typical handling time for orders is 1-business day. We do our best
to ship every package with-in 1 business day of receiving a cleared
payment. In some circumstances additional time may be need, in which
case we will contact buyer.

Shipped orders that are returned by the shipping company due to an
insufficient address or an undeliverable address will be refunded less a
20% restocking fee.

If package is refused or marked undeliverable and returned
back to us by the carrier, you will need to pay the shipping cost in
full to have the package sent back to you or we can refund the money
minus the cost of shipping


If you have not received your package, but the tracking information shows that it was delivered,
please do the following within 36 hours of expected, stated delivery:


Verify the shipping address on the order is the address where you are looking for the package

Look for a notice of attempted delivery

Look around the delivery location for the package, or see if a neighbor has accepted the delivery

Be sure to double check your mailbox and other usual spots for package delivery


If you think that your package has been stolen, we will require a police report since this is now theft.
Once we have a police report on file for the stolen package, we will reship your order.

Customer Reviews

Be the first to write a review