Garage
Shop

See all parts that fit your 2020 Gladiator

JBL ASB4128

4000W 18" Dual Medium Powered Subwoofer with Large Vent Area for High Output

JBL
Shop all JBL
Product videos
highlight-star-icon

18" Dual Medium Powered Subwoofer • 4000W Peak • 600W RMS • 14 Gauge Perforated Steel Grille • Parallel Discrete Switchable Operation • Front-Loaded, Vented Configuration • Black DuraFlex Finish

Learn more about the asb4128

We apologize

This item has been discontinued

NVX - Worth the Envy - Direct to Consumer Car Audio

Loading...
APSUB-CH41 main

PAC APSUB-CH41

Amplifier and Subwoofer Integration Interface for select 2013-2024 vehicles from Ram, Jeep, Dodge

-27.36%

$239.00

List price $329.00

72-6514 main

Metra 72-6514

Install New Speakers in select 1999-2026 vehicles from Dodge, Ram, Jeep

70
-37.52%

$9.99

List price $15.99

SRK-JW18HX main

PAC SRK-JW18HX

Replace Factory Stereo with Stinger HORIZON10 or HEIGH10 Receivers in select 2018-2023 vehicles from Jeep

-26.19%

$420.00

List price $569.00

AP4-CH41 main

PAC AP4-CH41 R.2

Amplifier Integration Interface for select 2013-2023 vehicles from Ram, Jeep, Dodge

4
-16.03%

$419.00

List price $499.00

JP-JTKT main

Metra JP-JTKT

550-lines Replacement Rearview Camera with Multi-Mount Brackets for select 2020-2026 Gladiator

-10.47%

$153.99

List price $171.99

LPHCH41 main

PAC LPHCH41

Vehicle Specific Audio Integration T-Harness for select 2013-2024 vehicles from Ram, Jeep, Dodge

-43.41%

$73.00

List price $129.00

JP-1014 main

Metra JP-1014 Speaker Pods Adapters

Install aftermarket 6.5" or 6.75" speakers in select 2018-2024 Gladiator and Wrangler (JL)

7
-10.11%

$79.99

List price $88.99

JP-1015 main

Metra JP-1015 Soundbar Speaker Adapters

Install aftermarket 6.5" speakers in select 2018-2024 Gladiator and Wrangler (JL)

3
-46.53%

$99.99

List price $186.99

SBA-J-JL-FHB main

JL Audio SBA-J-JL-FHB

Master ANL Fuse Holder Bracket for select 2018-2024 Gladiator and Wrangler (JL)

SPV-65-JLT main

Alpine SPV-65-JLT

Rear Soundbar Speaker Upgrade Kit with 6.5" Component Speakers for select 2018-2023 vehicles from Jeep

3
-16.67%

$599.95

List price $720.00

Product Highlights


18" Dual Medium Powered Subwoofer • 4000W Peak • 600W RMS • 14 Gauge Perforated Steel Grille • Parallel Discrete Switchable Operation • Front-Loaded, Vented Configuration • Black DuraFlex Finish

Description


JBL brand icon

Authorized dealer

Product Features
  • 18" Dual Medium Powered Subwoofer
  • Power Handling
    • Peak: 4000 watts
    • RMS: 600 watts
  • Impedance Per Speaker: Single 8 ohm
  • Parallel/Discrete Switchable operation
  • Front-Loaded, vented configuration
  • Deep, rectangular cabinet allows for extended low frequency bandwidth with minimum frontal profile
  • Black DuraFlex finish
  • Powder coated 14 gauge perforated steel grille
  • NL4 Neutrik Speakon and CE-compliant covered barrier strip terminals
  • Frequency Range: 30-1000 Hz
  • Frequency Response: 40-1000 Hz
  • Max SPL: 133 dB
  • Sensitivity: 103 dB
  • Dimensions: 32-1/4"D x 22-1/8"W x 43-1/8"H
  • 1-year Manufacturer's warranty

Loading...
R2-DB8V-TRK main

Alpine R2-DB8V-TRK

2000W Peak (700W RMS) Loaded Dual 8" R-Series Vented Truck Enclosure for select 2007-2024 vehicles from Ford, Jeep, Ram

1
-16.67%

$999.95

List price $1200.00

S2-DB8V-TRK main

Alpine S2-DB8V-TRK

600W Peak (300W RMS) Loaded Dual 8" Vented Enclosure for select 2007-2024 vehicles from Jeep, GMC, Ford

-16.67%

$849.95

List price $1020.00

JT-S84LD main

DS18 JT-S84LD

3600W Peak (1800W RMS) Loaded Quad 8" Sealed Enclosure with Digital LED Lights for select 2020-2026 Gladiator

$1,249.95

Limited time!
SBX-J-JTGLAD/10TW1 main

JL Audio Stealthbox® SBX-J-JTGLAD/10TW1

Custom Fit 10" Subwoofer Enclosure for select 2020-2026 Gladiator

-46.67%

$1,599.99

List price $2999.99

TXJ-TD8 main

AudioControl TX-JTD8

1000W RMS Loaded Dual 8" Vented Enclosure for select 2020-2024 Gladiator

-15.02%

$849.00

List price $999.00

MBQJT-SUB-1 main

MB Quart MBQJT-SUB-1

Custom underseat enclosure with two 8" subs fits select 2020-2026 Gladiator

-10.00%

$629.99

List price $699.99

JP-GL1-12 main

VIBE JP-GL1-12

900W Peak (300W RMS) Loaded Single 12" Vented Truck Subwoofer Enclosure for select 2020-2025 Gladiator

Limited time!
MBQJT-SUBA-1 main

MB Quart MBQJT-SUBA-1

400W Tuned Dual Subwoofers System for select 2020-2023 Gladiator

-24.22%

$628.99

List price $829.99

Limited time!
46CSC654 main

Kicker CSC65 (46CSC654)

600W Peak (200W RMS) 6.5” CS Series 2 Way Coaxial 4-ohm Speakers

124
-33.36%

$79.96

List price $119.99

DMH-1800NEX main

Pioneer DMH-1800NEX

6.8" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay, Android Auto, and SiriusXM Ready

3
-19.05%

$339.99

List price $420.00


Best selling similar products

JBLPARTYBOX520AM small

JBL PartyBox 520 (JBLPARTYBOX520AM) (Black)

• PartyBox Portable Bluetooth Speaker
• Power Output Rating: 400 watts RMS
• IPX4 splashproof / dustproof
• Supports wired and wireless audio playback
• 3 hours of charging for 15 hours of playtime

$879.95

List price $1056.00

JBLPBCLUB120AM small

JBL PartyBox Club 120 (JBLPBCLUB120AM) (Black)

• Dual 5.25" woofers and dual 2.25" dome tweeters
• Dynamic, synchronized light show
• IPX4 certified splashproof
• Ergonomic body with foldable handle
• USB recharging
• Dimensions: 15.70"W x 17.20"D x 35.60"H

$449.95

List price $540.00

PartyBox 720 small

JBL PartyBox 720 (JBLPARTYBOX720AM) (Black)

• PartyBox Portable Bluetooth Speaker
• Power Output Rating: 800 watts RMS
• IPX4 splashproof / dustproof
• Supports wired and wireless audio playback
• 3 hours of charging for 15 hours of playtime

$1099.95

List price $1319.95

JBLPBCLUB120SWAM small

JBL PartyBox Club 120 (JBLPBCLUB120SWAM) (White)

• Dual 5.25" woofers and dual 2.25" dome tweeters
• Dynamic, synchronized light show
• IPX4 certified splashproof
• Ergonomic body with foldable handle
• USB recharging
• Dimensions: 15.70"W x 17.20"D x 35.60"H

$449.95

List price $540.00

JBLPBENCOREESS2AM small

JBL JBLPBENCOREESS2AM (Black)

• PartyBox portable Bluetooth speaker with LED
• Features AI sound boost
• Up to 15 Hours of play time
• Multi-speaker connection by Auracast
• Microphone and guitar inputs
• Control music from JBL PartyBox app
• IPX4 Splash proof speaker

$329.95

List price $396.00

JBLPARTYBOXULTAM small

JBL PartyBox Ultimate (JBLPARTYBOXULTAM) (Black)

• PartyBox Ultimate Portable Bluetooth Speakers with Light Patterns
• Power Output: 1100 watts
• Wired and wireless audio playback function with microphone input
• Bluetooth version 5.1
• IPX4 splashproof / dustproof rating

$1899.95

List price $2280.00

JBLPBOTGESAM small

JBL PartyBox On-The-Go Essential (JBLPBOTGESAM) (Black)

• PartyBox Encore Essential Portable Bluetooth Speakers
• Power Output: 100 watts
• IPX4 splashproof / dustproof rating
• Wired and wireless audio playback function
• Six LED light presets
• 3.5 hours of charging for 6 hours of play time

$379.95

List price $456.00

JBLPBSTAGE320AM small

JBL PartyBox Stage 320 (JBLPBSTAGE320AM) (Black)

• Dual 2" dome tweeters and 6.5" woofers
• Dynamic RGB Lighting
• IPX4 certified splashproof
• Telescopic handle and smooth-glide wheels
• USB recharging
• Dimensions: 15.70"W x 17.20"D x 35.60"H

$629.95

List price $756.00

JBLPBSTAGE320SWAM small

JBL PartyBox Stage 320 (JBLPBSTAGE320SWAM) (White)

• Dual 2" dome tweeters and 6.5" woofers
• Dynamic RGB Lighting
• IPX4 certified splashproof
• Telescopic handle and smooth-glide wheels
• USB recharging
• Dimensions: 15.70"W x 17.20"D x 35.60"H

$629.95

List price $756.00

Specifications & Details


Subwoofer Specifications
Power Configuration
Passive
Number of Drivers
2
Driver Size
18"
Frequency Response
40 - 1000 Hz
Maximum SPL (Sound Pressure Level)
133 dB
Inputs
Binding Posts (Banana Clip Ready)
SpeakOn
Passive Subwoofer Specifications
Peak Power Handling
4000 watts
Continuous Power Handling
600 watts
Impedance
8 ohms
Case Specifications
Mounting Options
Floor Standing
Grille
Yes
Height
43-1/8"
Width
22-1/8"
Depth
32-1/4"
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Item Details


Manufacturer:

JBL

Model Number:

ASB4128

Weight:

143.00lbs

Internal SKU:

asb4128

Internal Product ID:

32653

Product and How-to Videos


Customer Ratings & Reviews


JBL ASB4128 thumbnail image

5 star
0%
4 star
0%
3 star
0%
2 star
0%
1 star
0%



Durability
0
Value
0
Features
0
Design
0
Usability
0

Customer Reviews

Sort by:

Loading...
Sorry, no reviews found

Related Searches


Save up to 10 different vehicles in your garage
Vehicle
Store
Delete

2020 Jeep Gladiator

2012 Ford Mustang

2019 Genesis G80

2012 Mazda CX-7

1991 Hyundai Excel

1994 Audi 90 Quattro

1987 Audi 5000

2003 Chevrolet Tahoe

2013 Nissan Pathfinder

1976 GMC K3500 Pickup

Vehicle
Store
Delete

2005 Harley Davidson FLTR/I Road Glide

Add vehicle Clear all vehicles
Where to find vehicle info
Are you sure you want to clear your garage?
This action cannot be undone. Confirm
This page was not designed for products.
If you continue, you will be redirected to a category customized for your vehicle. Continue
Loading...
Identify your vehicle and submodel details
  • Owner's manual
  • Vehicle's insurance card
  • Vehicle registration
  • Vehicle produced after 2005: Inside driver's side door
  • Vehicle produced before 2005: Rear passenger doorjamb, glove box, center console, or engine compartment
Car Info Side Door Icon
Vehicle Registration Icon
Vehicle Insurance Icon

Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:

  • You see only parts engineered for your exact vehicle
  • You avoid incompatible radios, speakers, or wiring
  • Installation is smoother, faster, and frustration-free
  • You get the correct accessories the first time

Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.