Garage
Shop

See all parts that fit your 2003 Corolla

Kicker CompRT CWRT121 (43CWRT121)

1000W Peak (500W RMS) 12" Comp RT Dual 1-ohm Shallow Mount Subwoofer

Kicker
Shop all Kicker
Product videos
highlight-star-icon

• 500 Watts RMS
• 1000 Watts Max
• Injection-molded polypropylene cone
• Tough Santoprene surround
• All-weather slim subwoofer
• UniPlate™ backplate
• Frequency Response: 25 - 500Hz

Learn more about the 43cwrt121

Good news and a little bad...

This item has been discontinued

But you may be interested in the newest model that's available.

48cwrt122 thumbnail

Kicker CWRT122 (48CWRT122)

OUR PRICE: $199.96

View item

Loading...
72-8104 main

Metra 72-8104

Install New Speakers in select 1990-2024 vehicles from Toyota, Subaru, Mitsubishi

87
-20.01%

$11.99

List price $14.99

70-1761 main

Metra 70-1761 Wiring Harness

Install a new car stereo in select 1984-2022 vehicles from Toyota, Subaru, Scion

97
-14.31%

$5.99

List price $6.99

82-8152 main

Metra 82-8152

6×9 Inch Multi-App Speaker Adapter for select 2002-2013 vehicles from Toyota

4
-12.00%

$21.99

List price $24.99

95-8204 main

Metra 95-8204 Dash Kit

Install a new Double-DIN car stereo in select 2003-2008 Corolla

4
-50.02%

$11.99

List price $23.99

TA02BCB main

Scosche TA02BCB

Install a New Car Stereo in select 1986-2018 vehicles from Toyota

1
ToyK958 main

American International ToyK958

Double DIN Stereo Dash Kit for select 2003-2008 Corolla

5
-48.45%

$14.95

List price $29.00

Limited time!
46CSC654 main

Kicker CSC65 (46CSC654)

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

123
-33.36%

$79.96

List price $119.99

Limited time!
46CSC6934 main

Kicker CSC693 (46CSC6934)

900W Peak (300W RMS) 6x9” CS Series 3 Way Coaxial 4-ohm Speakers with Integrated Midrange Speakers

40
-30.02%

$111.96

List price $159.99

UTE-73BT main

Alpine UTE-73BT

Single DIN Digital Media Receiver with Bluetooth

44
-16.69%

$149.95

List price $180.00

KW-M560BT main

JVC KW-M560BT

6.8" Double-DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay, Android Auto (Sirius XM Ready)

10

Product Highlights


• 500 Watts RMS
• 1000 Watts Max
• Injection-molded polypropylene cone
• Tough Santoprene surround
• All-weather slim subwoofer
• UniPlate™ backplate
• Frequency Response: 25 - 500Hz

Description


Kicker brand icon

Authorized dealer



General Features:

  • 12" CompRT Series Dual Voice Coil 1 Ohm Subwoofer
  • Power Handling:
    • Peak: 1000 watts
    • RMS: 500 watts
  • Recommended power range: 350 - 500 RMS
  • Injection-molded polypropylene cone
  • Tough Santoprene surround with interlocking front gasket
  • All-weather slim subwoofer
  • Thick magnet structure delivers huge power handling without compromising mounting depth
  • UniPlate™ backplate and solid pole piece absorb heat to provide excellent thermal management
  • Dual 1 Ohm Voice Coil
  • Top-mount depth: 3 3/4"
  • Cutout diameter: 11"
  • Frequency Response: 25 - 500Hz
  • Sensitivity: 85.5 dB
  • Resonance Frequency (Fs): 29.4Hz
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty
  • Priced Individually

Check out the 43CWRT121 Owner's Manual
Tips for Installing the 43CWRT121 Subwoofer


Product history:

Kicker CWRT122 thumbnail
(newest, current model)
Kicker 43CWRT121 thumbnail
(previous model, replaced by Kicker CWRT122 (48CWRT122))
Kicker 40CWRT121 thumbnail
(previous model, replaced by Kicker CompRT CWRT121 (43CWRT121))

Loading...
Limited time!
46CSC654 main

Kicker CSC65 (46CSC654)

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

123
-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
-16.67%

$349.99

List price $420.00

Limited time!
46CSC6934 main

Kicker CSC693 (46CSC6934)

900W Peak (300W RMS) 6x9” CS Series 3 Way Coaxial 4-ohm Speakers with Integrated Midrange Speakers

40
-30.02%

$111.96

List price $159.99

43DSC6504 main

Kicker DSC650 (43DSC6504)

480W Peak (120W RMS) 6.5” DS Series 2-way 4-ohm Coaxial Car Speakers (DSC6504)

28
-10.53%

$84.99

List price $94.99

CV15BT main

Cerwin-Vega CV15BT

Single Din Digital Media Receiver with Bluetooth

3
UTE-73BT main

Alpine UTE-73BT

Single DIN Digital Media Receiver with Bluetooth

44
-16.69%

$149.95

List price $180.00

Limited time!
DMH-W3050NEX main

Pioneer DMH-W3050NEX

6.8" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Wireless Apple CarPlay and Android Auto, and Built-in Alexa (Sirius XM Ready)

1
-24.20%

$469.99

List price $620.00

SXE-6926S main

Alpine SXE-6926S

280W Peak (90W RMS) 6x9” SXE Series 2-way 4-ohm Coaxial Speakers

13
-20.84%

$56.99

List price $71.99

DB652 main

Polk Audio DB652 (DB 652)

600W Peak (200W RMS) 6.5" DB+ Series 2 Way Coaxial 4-ohm Car, Marine and Powersports Speakers

12
-9.16%

$109.00

List price $119.99

MPK 163.3 main

Hertz MPK163.3

600W Peak (300W RMS) 6.5" Mille PRO Series 3-way 4-ohm Component Speaker System

2
-14.89%

$999.99

List price $1175.00


Best selling similar products

Marine Club 12 small

JBL CB122 Club Marine 12

• Peak Power: 1200 watts
• RMS Power: 400 watts
• Polypropylene Cone
• Rubber Surround
• Impedance: Single 4 ohm
• Mount depth: 7-13/16"
• Sensitivity: 89 dB

(1)

$119.95

List price $379.95

VCW124v3 small

NVX VCW124 Version 3 (VCW124v3)

• Peak Power: 2400 watts
• RMS Power: 1200 watts
• Impedance: Dual 4 ohm
• Carbon Fiber Enhanced Non-Pressed Paper Cone
• Custom High Roll Foam Surround with black nylon stitching
• Mount depth: 7.02"
• Sensitivity: 85 dB (1W/1m)

(132)

$239.99

List price $287.99

SQW124 small

NVX SQW124

• Peak Power: 1200 watts
• RMS Power: 600 watts
• Impedance: Dual 4 ohm
• Polypropylene Cone
• Rubber Surround
• Mount depth: 3.51"
• Sensitivity: 84 dB

$299.99

List price $359.99

Specifications & Details


Subwoofer Specifications
Series
CompRT Series
Subwoofer Size
12"
Peak Power Handling
1000 watts
RMS Power Handling
500 watts
Voice Coil(s)
Dual
Impedance (Per Voice Coil)
1 ohm
Sensitivity
85.5 dB
Xmax (millimeters)
10.5 mm
Subwoofer Design
Round / Circle
Main Cone Color
Dark Gray
Woofer Composition
Polypropylene
Woofer Surround
Santoprene Rubber
Subwoofer Grille
No
Re-Cone Kit Available
No
Recommended Enclosure Specifications
Recommended Enclosure Type
Ported / Vented
Sealed
Minimum Sealed Box Volume
0.55 cubic feet
Maximum Sealed Box Volume
2.0 cubic feet
Minimum Ported Box Volume
1.75 cubic feet
Maximum Ported Box Volume
2.26 cubic feet
Top-Mount Depth (Mounting Depth)
3 3/4"
Cutout Diameter
11"
Shallow Mount Installation
Yes
T/S Parameters (Electromechanical)
Free-Air Resonance (Fs)
29.4 Hz
Equivalent Compliance (Vas)
1.92 liters
Total Speaker Q Value (Qts)
0.5895
Electrical Q Value (Qes)
0.616
Electrical Resistance of Voice Coil (Re)
2.01 ohm
Mechanical Q Value (Qms)
13.723
What is in the box?
Paperwork
User manual
WITB: Subwoofers
Subwoofer
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Item Details


Manufacturer:

Model Number:

43CWRT121

Weight:

12.00lbs

Internal SKU:

43cwrt121

Internal Product ID:

108677

Product and How-to Videos


  • Car Subwoofer Size Buying Guide | What Size of Sub Should I Get?
  • How to Install a Car Subwoofer in a Box

Customer Ratings & Reviews


Kicker CompRT CWRT121 (43CWRT121) thumbnail image

5 star
100%
4 star
0%
3 star
0%
2 star
0%
1 star
0%



Durability
5
Value
5
Features
5
Design
5
Usability
5

Customer Reviews

Sort by:

Loading...

Sounds amazing for a shallow mount sub

I had this installed with a Kicker 1200.1 amp and ported box behind the back seat of my F350. Bass is boomy but also has quick punch for various genres of music. Very happy.

By Jeremiah on August 17, 2016

18 found this helpful


Great Value

Really recommend this product works exceptionally great bass overall great product

By Anonymous on August 3, 2018 Checkmark Icon Verified purchase

17 found this helpful


Great Value!

This subwoofer is great! It’ sounds amazing and it’s the perfect depth for a truck box.

By brian on March 27, 2018

16 found this helpful


Great sub

Really pleased with the sub I have one 12 in a sealed box and it’s more than enough for me. Great sound from a small enclosure you can’t go wrong.

By Karl on September 27, 2017

16 found this helpful




TS-W3002D2 small

Pioneer TS-W3002D2 Open Box

(Open Box) 12" Dual 2 ohm Champion PRO Series Subwoofer

$99.99

List price $329.99

SB-F-EXPL2/10W3v3/GA small

JL Audio SB-F-EXPL2/10W3v3/GA

Stealthbox for 2002-2005 Ford Explorer 4dr with Graphite interior

$699.99

List price $999.99

No picture

Hifonics BX12SQD2 ( SQUARE )

Square Brutus Series Dual 2 ohms 12" Subwoofer

$89.99

List price $199.99

Related Searches


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

2003 Toyota Corolla

2002 Mazda MPV

2012 BMW 535i GT

1985 Chevrolet Chevette

2002 Hummer H1

2008 Mitsubishi Outlander

2016 Toyota Camry

2021 Volvo XC40

2012 Volkswagen Golf

2024 MINI Countryman

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.