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Deal.ai › Kicker
Kicker
KICKER KS Series 51KSC6504 6.5" Coaxial 2 Way Speakers (Pair)

KICKER KS Series 51KSC6504 6.5" Coaxial 2 Way Speakers (Pair)

Best price now

$103.96at Audio SavingsChecked 8 h ago

20% under what the other stores charge

Compared across 14 stores. Prices are checked against each store and labelled with when.

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Price facts

  • Lowest price today: $103.96 at Audio Savings (checked Nov 13, 2026).
  • Checked at 14 stores.

Our take on the KICKER KS Series 51KSC6504 6.5" Coaxial 2 Way Speakers (Pair)

The Kicker KS Series 51KSC6504 is a pair of 6.5-inch two-way coaxial car speakers built for high output. A polypropylene woofer with a rubber surround handles midbass, and a silk-dome tweeter keeps the highs smooth rather than harsh. The shallow mounting depth of under 2 inches and minimal tweeter protrusion let them fit behind many factory grilles. They suit drivers replacing worn factory speakers who want louder, cleaner sound without cutting doors or adding amps.

Best forDrivers replacing stock 6.5-inch factory speakersShallow-mount installs behind factory grillesListeners who want loud volume without harsh highsBudget upgrades run off a head unit or small amp
Pros
  • Silk-dome tweeter gives smooth, non-fatiguing highs
  • Polypropylene woofer with rubber surround handles midbass well
  • Shallow mounting depth fits many vehicles
  • Low tweeter protrusion clears factory grilles
  • Handles up to 100 watts RMS for high volume
  • Grilles included in the box
Cons
  • Needs an amp or strong head unit to reach its potential
  • Bass is modest without a subwoofer
  • Some find the tweeter bright at high volume
  • Not a component set, so no separate tweeter placement

KICKER KS Series 51KSC6504 6.5" Coaxial 2 Way Speakers (Pair) prices at every store

  • Pro Audio CenterNew

    In stockReturn policy

    $103.96Checked 8 h ago
    Visit Pro Audio Center
  • trailseven.comNew

    In stockReturn policy

    $103.96Checked 8 h ago
    Visit trailseven.com
  • World Wide StereoNew

    In stockReturn policy

    $103.96Checked 8 h ago
    Visit World Wide Stereo
  • Stereo WarehouseNew

    In stockReturn policy

    $103.96Checked 8 h ago
    Visit Stereo Warehouse
  • Freemans Car StereoNew

    In stockReturn policy

    $103.96Checked 8 h ago
    Visit Freemans Car Stereo
  • Audio SavingsNew

    In stockReturn policy

    $103.96Checked 8 h ago
    Visit Audio Savings
  • Plug N Play KitsNew

    In stockReturn policy

    $129.99Checked 8 h ago
    Visit Plug N Play Kits
  • Moon Car StereoNew

    In stockReturn policy

    $129.99Checked 8 h ago
    Visit Moon Car Stereo
  • AudiotisticsNew

    In stock

    $129.99Checked 8 h ago
    Visit Audiotistics
  • Big Jeff Online IncNew

    In stockReturn policy

    $129.99Checked 8 h ago
    Visit Big Jeff Online Inc
  • Creative AudioNew

    In stock

    $133.52Free shippingChecked 8 h ago
    Visit Creative Audio
  • WalmartNew

    In stockSold by Creative Audio

    $133.52Free shippingChecked 8 h ago
    Visit Walmart
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $103.96Free shippingChecked 8 h ago
    Visit Amazon
  • TargetNew

    Availability unknown

    $133.52Free shippingChecked 8 h ago
    Visit Target

Store links may earn us a commission.

KICKER KS Series 51KSC6504 6.5" Coaxial 2 Way Speakers (Pair) price history

Lowest price we've seen: $103.96 on Nov 13 at Amazon. Tracked across 4 stores since Nov 13.

What reviewers say

Owners generally rate the KS Series as a solid step up from factory speakers, praising the smooth highs and loud, clean output. Complaints center on modest bass and a tweeter that can sound bright when pushed.

What people mention
  • Sound qualityPraisedOwners say the speakers sound clean and detailed, a clear upgrade over factory units.
  • TweeterMixedThe silk-dome tweeter is smooth for most, but some find it bright when pushed hard.
  • BassCriticisedReviewers note the low end is modest and benefits from a subwoofer.
  • FitPraisedThe shallow mounting depth makes installation easy in many vehicles.
  • PowerMixedThey handle high power well, but sound best with an amp rather than a stock head unit.

About the KICKER KS Series 51KSC6504 6.5" Coaxial 2 Way Speakers (Pair)

The Kicker KS Series KSC6504 is a pair of 6.5-inch coaxial 2-way car speakers. Each speaker has a polypropylene woofer cone with an internally dampened design and a rubber surround for midrange and midbass. A 3/4-inch silk-dome tweeter handles the highs.

The thin-mount design fits behind factory grilles. Grilles are included. The speakers work best with 15 to 100 watts RMS of recommended amplifier power.

Quantity
1 pair
Design
2-way coaxial
Woofer
6-1/2 in (160 mm)
Tweeter
3/4 in (20 mm)
Impedance
4 Ω
Recommended power
15-100 watts RMS
Sensitivity
90 (1 W, 1 m)
Frequency response
43 Hz-21 kHz
Mounting hole
4-13/16 in (123 mm) diameter
Top mount depth
1-13/16 in (46 mm)
Bottom mount depth
2-3/16 in (54 mm)
Tweeter protrusion
5/16 in (8 mm)
Woofer cone
Polypropylene
Woofer surround
Rubber
Tweeter dome
Silk
Tweeter magnet

Questions and answers

Do these fit my car?
They are 6.5-inch coaxials with a mounting depth under 2 inches, so they fit many vehicles that take that size. Check your factory speaker size and depth before buying.
Do I need an amplifier?
They work off a head unit but are rated for 15 to 100 watts, so an amp gets the most from them.
Is a subwoofer needed?
They deliver midbass but limited deep bass, so a subwoofer fills in the low end.
What is in the box?
A pair of speakers and grilles.
Are they better than component speakers?
Coaxials are simpler to install, while components allow separate tweeter placement for better staging.
Where is the KICKER KS Series 51KSC6504 6.5" Coaxial 2 Way Speakers (Pair) cheapest?
At Audio Savings, for $103.96, 20% under what the other stores charge, as of our latest check.
Where can I buy the KICKER KS Series 51KSC6504 6.5" Coaxial 2 Way Speakers (Pair)?
14 stores we checked sell it, including Pro Audio Center, Plug N Play Kits, trailseven.com, World Wide Stereo, Moon Car Stereo.

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Stores we've priced the KICKER KS Series 51KSC6504 6.5" Coaxial 2 Way Speakers (Pair) at

  • Creative Audio deals and prices
  • Target deals and prices
  • Walmart deals and prices

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