StoreDeal.ai store
Shop
  • Deals
  • Deal checker
  • Black Friday
  • Buying guides
  • Brands
  • Stores
Travel
  • Flight deals
  • Hotel deals
Company
  • Research
  • Press
  • Use in AI assistants
  • Contact
  • deal.ai apps
Black Friday 2026
  • Walmart
  • Best Buy
  • Target
  • TVs
  • Laptops
  • Headphones
  • Apple
  • Gaming
  • Vacuums
  • Kitchen
  • Toys
  • Smartwatches
  • Tablets
  • Furniture
  • Mattresses
© Deal.ai Inc.·2222 Ponce de Leon Blvd, Miami, FL 33134·support@deal.ai
TermsPrivacy
Deal.ai › Kicker
Kicker
W8K9D4
Kicker

W8K9D4

5(4 ratings)

Best price now

$99.95at RockvilleChecked Nov 8

Prices are checked against each store and labelled with when.

Visit Rockville

Ask our agent about this product

It checks today's price at every store, compares the alternatives and answers in about a minute.

Enter to send, Shift+Enter for a new line

Price facts

  • Last seen at $99.95 at Rockville on Nov 8.
  • Our take on the W8K9D4

    The Kicker K9 is a car audio subwoofer built for high-output bass in a compact motor and frame. It uses a dual 4-ohm voice coil, so a single sub can be wired to 2 or 8 ohms and a pair to 1 or 4 ohms, which gives installers flexibility in matching an amplifier. It suits bass-heavy listeners and SPL builds that want a hard-hitting sub without stepping up to a larger frame size. Against mainstream subs it trades some low-end extension for punch and power handling, and owners of Kicker's square and round lines describe it as a loud, durable driver for the money.

    Best forBass-heavy music fansCar audio installers wiring dual voice coilsSPL and daily-driver buildsBuyers wanting a loud sub in a compact frame
    Pros
    • Dual 4-ohm voice coils allow 2-ohm or 8-ohm single-sub wiring
    • Pairs wire to 1 ohm or 4 ohms for flexible amp matching
    • Kicker build quality and reputation for durability
    • Strong output for its size
    • Works in sealed or ported enclosures
    Cons
    • Needs a capable amplifier to reach its potential
    • Deep sub-bass extension is limited compared with larger subs
    • Best output requires a properly built enclosure
    • Not a drop-in for factory systems without added power

    W8K9D4 prices at every store

    • RockvilleNew

      In stockReturn policy

      $99.95Checked Nov 8
      Visit Rockville

    What reviewers say

    Owners of Kicker subs generally praise output and durability, and the K9 line is described as loud and hard-hitting for its size. Some note it needs real amplifier power and a good enclosure to sound its best.

    What people mention
    • OutputPraisedOwners say it plays loud and hits hard for its size.
    • BuildPraisedReviewers describe the driver as sturdy and durable.
    • WiringPraisedThe dual 4-ohm coils give installers useful impedance options.
    • Power needsMixedSome say it only performs with a capable amplifier behind it.
    • Low bassCriticisedCritics note it does not dig as deep as larger subwoofers.

    About the W8K9D4

    This is a K9 Series 8-inch car subwoofer with dual 4-ohm voice coils. It is rated for 2000 watts peak, 1000 watts program and 500 watts CEA RMS power handling.

    The cone is black non-pressed paper with black stitched reinforcement, a thick foam surround and a polypropylene dustcap. The poly cotton spider is elastic. The cast aluminum basket has a black sanded finish. A vented hole in the T-yoke helps dissipate heat.

    The voice coils are 2.5" 4-layer ASV coils wound with OFC wire in the USA. They are stable up to 200 degrees Celsius. The motor uses a double stacked 122 oz magnet with a high BL magnetic gap. Rubber boot covers protect the magnet, and a custom mounting gasket helps make an air-tight mount.

    Size
    8"
    Impedance
    Dual 4-ohm voice coils
    Peak power
    2000 W
    Program power
    1000 W
    RMS power
    500 W (CEA rated)
    Voice coil
    2.5" 4-layer ASV, OFC wire, made in USA, stable up to 200°C
    Magnet
    Double stacked, 122 oz
    Motor
    10 mm T-yoke and 10 mm washer, vented T-yoke, high BL magnetic gap
    Basket
    Cast aluminum, black sanded finish
    Cone
    Black non-pressed paper with black stitching reinforcement
    Surround
    Thick foam
    Dustcap
    Polypropylene (PP)
    Spider
    Poly cotton

    Questions and answers

    What does dual 4-ohm voice coil mean for wiring?
    Each coil is 4 ohms. Wire them in parallel for 2 ohms or in series for 8 ohms with one sub; two subs give 1 ohm or 4 ohms.
    What amplifier power does it need?
    It is a high-output sub, so it wants an amplifier rated near its RMS handling. Underpowering it will not show what it can do.
    Sealed or ported enclosure?
    It works in either. A ported box tuned for output gives more volume; a sealed box gives tighter, more controlled bass.
    Is it good for deep bass in a daily driver?
    It is punchy and loud, but very low sub-bass extension is limited compared with larger subs. It suits music with strong mid-bass.
    Can I run two of them?
    Yes. Two dual 4-ohm subs wire to 1 ohm or 4 ohms, which matches many mono amplifiers.
    Where is the W8K9D4 cheapest?
    At Rockville, for $99.95, as of our latest check.
    What do buyers say about the W8K9D4?
    Rated 5 out of 5 from 4 ratings.

    More from Kicker

    • K
      Kicker 50CWCS84 8" 4-Ohm SVC CompC Subwoofer
      Kicker 50CWCS84 8" 4-Ohm SVC CompC Subwoofer
    • K
      Kicker CX1200.1 1200W Mono Class D Amplifier
      Kicker CX1200.1 1200W Mono Class D Amplifier
    • K
      Kicker CX1200.1 1200W Mono D Audio Amplifier 43CXA12001
      Kicker CX1200.1 1200W Mono D Audio Amplifier 43CXA12001
    • K
      Kicker CX Series 46CXA12001T Monoblock Class D 1200W Amplifier
      Kicker CX Series 46CXA12001T Monoblock Class D 1200W Amplifier
    • K
      Kicker HDRG Harley-Davidson Road Glide Grilles
      Kicker HDRG Harley-Davidson Road Glide Grilles
    Terminals
    Two chrome-plated binding posts
    Frequency response
    48 Hz to 800 Hz
    Sensitivity
    81.2 dB
    Sealed enclosure
    0.28 to 0.42 cu ft
    Ported enclosure
    0.64 to 0.92 cu ft
    Cutout diameter
    7.32"
    Mounting depth
    5.91"
    Weight
    18.74 lbs
    Gap plate
    Inside diameter 67.4 mm (2.65"), outside diameter 145 mm (5.71"), thickness 10 mm (0.39")
    Yoke
    Outside diameter 145 mm (5.71"), thickness 10 mm (0.39"), pole diameter 60.1 mm (2.37")
    Included
    Custom mounting gasket, rubber boot magnet covers
    K
    Kicker 11" 300W RMS 4-Ohm Horn-Loaded Marine Tower Speakers Pair w/ LED Grilles
    Kicker 11" 300W RMS 4-Ohm Horn-Loaded Marine Tower Speakers Pair w/ LED Grilles
  • K
    Kicker 43CWRT102 CompRT 10
    Kicker 43CWRT102 CompRT 10
  • K
    Kicker 50CWCS84 CompC 8" SVC 4 ohm Subwoofers+Mono Amplifier+Amp Kit CWCS84
    Kicker 50CWCS84 CompC 8" SVC 4 ohm Subwoofers+Mono Amplifier+Amp Kit CWCS84
  • All Kicker deals and products →

    More car subwoofers

    • D
      DS18 8in 450 Watts RMS 4 ohm DVC ZR Subwoofer
      DS18 8in 450 Watts RMS 4 ohm DVC ZR Subwoofer
    • V
      VFL 8″ Car Subwoofer
      VFL 8″ Car Subwoofer
    • R
      RVB8.1A + RWK10 Bundle
      RVB8.1A + RWK10 Bundle
    • Z
      ZR 8" Subwoofer 450 Watts Rms DVC 4-Ohm
      ZR 8" Subwoofer 450 Watts Rms DVC 4-Ohm
    • P
      PUNISHER 8D2
      PUNISHER 8D2
    • D
      DS18 Select Series 8" 200W RMS 4-Ohm Single Voice Coil Car Audio Subwoofer SLC8S
      DS18 Select Series 8" 200W RMS 4-Ohm Single Voice Coil Car Audio Subwoofer SLC8S
    • Z
      ZR 8" Subwoofer 450 Watts Rms DVC 2-Ohm
      ZR 8" Subwoofer 450 Watts Rms DVC 2-Ohm
    • P
      PRV Audio RS8-SUBD4 8" RS Series 500W RMS | 1000W Max Car Subwoofer 4-Ohm DVC
      PRV Audio RS8-SUBD4 8" RS Series 500W RMS | 1000W Max Car Subwoofer 4-Ohm DVC