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Kicker 40CWRT672

CompRT shallow-mount 6-3/4" subwoofer with dual 2-ohm voice coils

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Our take on the Kicker 40CWRT672

by John Pollard
Kicker

What's a component sub and why would I want one?

A component sub is simply a speaker that's designed to reproduce bass once it's installed in a compatible enclosure. Think about the impact of a movie soundtrack in a big theater or even in your own home HDTV setup. A component sub can add the same kind of power to the music in your car. And a car sub is not all about the boom that you hear on a street corner (although that's cool too) - you can pair a component sub with your choice of enclosure to get bass just the way you like it, from tight and punchy to fat and loose. And once you experience music in your car with a well-tuned subwoofer, you'll never go back.

A thin sub with big sub bass

If you're looking for bass for a tight space, Kicker designed their CompRT subs with compact cars, pickup trucks, and even motorcycles in mind. The low-profile 40CWRT672 6-3/4” subwoofer performs just like a full-size sub, but without killing all your cargo space. This high-performance CompRT sub stands less than 3" tall, so your installation options are wide open.

Kicker 40CWRT672

This sub clocks in at less than 3" deep.

Built with boom in mind

The 40CWRT672 comes equipped with a rigid injection-molded polypropylene cone that won't flex and cause distortion while you're cranking the bass. Its rubber surround will last through years of heavy use, combining with a special-design back and top plate to give you more excursion (which equals more bass) than other skinny subs.   

Made to work with many systems

This sub handles up to 150 watts RMS so make sure you've got a solid amp to power it. You can wire the dual voice coils for either 4- or 1-ohm total impedance, giving you more wiring options when setting up your system. This sub sounds great in a sealed enclosure.

Important Note: If you are wiring this DVC sub for low impedance, make sure that your amp is compatible. You can damage or destroy your amp by exceeding recommended minimum impedance.

See more info on this item

Highlights:

  • 6-3/4" subwoofer with dual 2-ohm voice coils
  • injection-molded polypropylene cone
  • rubber surround
  • power handling: 50-150 watts RMS (75 watts per coil)
  • peak power handling: 300 watts
  • frequency response: 30-500 Hz
  • sensitivity: 84.6 dB
  • top-mount depth: 2-3/4"
  • sealed box volume: .18 - .75 cu. ft.
  • warranty: 1 year
  • Our 60-day money-back guarantee

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
Size
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6 3/4 -inch
Impedance
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2 ohms
Cone Material
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Injection Molded Poly
Surround Material
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Santoprene
Ideal Sealed Box Volume (cubic feet)
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N/A
Ideal Ported Box Volume (cubic feet)
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N/A
Port diameter (inches)
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N/A
Port length (inches)
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N/A
Free-Air
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No
Dual Voice Coil
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Yes
Sensitivity
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84.6 dB at 1 watt
Frequency Response
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30 - 500 Hz
RMS Power Range (Watts)
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50-150
Peak Power Handling (Watts)
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300
Top Mount Depth (inches)
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2 3/4
Bottom Mount Depth (inches)
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N/A
Cutout Diameter or Length (inches)
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5 1/2
Vas (liters)
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9.28
Fs (Hz)
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53.9
Qts
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0.677
Xmax (millimeters)
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0
Parts Warranty
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1 Year
Labor Warranty
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1 Year
Product Research
What's in the box?

Download owner's manual

  • One 6-3/4" Subwoofer
  • Kicker logo stickers
  • Manual (English/ Spanish/ German/ French)
  • Template on box

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Features

Dual 2-ohm Voice Coils: This woofer features dual 2-ohm voice coils, offering wiring flexibility. When the voice coils are wired in parallel the woofer presents a 1-ohm load. When the voice coils are wired in series the woofer presents a 4-ohm load.

Tinsel Leads: CompRT subwoofers use Spiralead tinsel-lead technology; the tinsel lead wires are woven into the spider to relieve mechanical stress.

Enclosure Compatibility

Shallow-Mount: Kicker's CompRT series is designed to minimize depth, giving you subwoofer options where standard enclosures don't fit. The vent-less, solid-pole design allows the woofer to be mounted directly against the rear wall of a sealed enclosure.

Recommended Enclosure: Kicker recommends a sealed enclosure for the 40CWRT672 (vented enclosures are not recommended):

  • Minimum Enclosure Volume: 0.18 ft³
  • Maximum Enclosure Volume: 0.75 ft³
 
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Kicker 40CWRT672 Reviews

Average Customer Review:

17 people say:

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5 out of 5

Kicker 40CWRT672 / Honda Element Install

Written By Chris, Sebastian, Fl on Wednesday, July 02, 2014
Crutchfield Customer Review (What's this?)
 
Needed a replacement woofer and speakers for my Honda Element. The kicker dropped into place with and only needed to drill a couple of holes as some lined up perfectly with the factory install. I didnt feel the stock Element enclosure needed any tuning and the sound was much better then the factory sub.
Pros:
No modifications needed except a couple of new drill holes.
Cons:
None
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5 out of 5

Wrangler Console Sub Replacement

Written By Mike Y., Avon, MA on Sunday, June 15, 2014
Crutchfield Customer Review (What's this?)
 
After some minor adjustments with screw placement, that weren't a big deal at all, this subwoofer perfectly replaced my wrangler stock one. Sounds great too.
Pros:
Sound
Cons:
Minor adjustments for screws
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5 out of 5

perfect match

Written By tkkat, margate, fl on Friday, May 30, 2014
Crutchfield Customer Review (What's this?)
 
excellent replacement for my factory subwoofer
Pros:
perfect match
Cons:
none
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5 out of 5

05 Jeep Wrangler

Written By ErinB, Charleston, SC on Friday, May 02, 2014
Crutchfield Customer Review (What's this?)
 
Replaced factory "Infinity" sub. There were some minor mods to make to the speaker box. After that, it was pretty much plug'n'play. The sound is great and build/quality of the product are far superior to that of the factory model.
Pros:
Great fit, specialized product for small sub replacement, excellent sound quality
Cons:
none that I've seen so far
1 out of 1 people found this helpful
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5 out of 5

replacement for wrangler sub

Written By TrentW, South Ga on Monday, April 14, 2014
Crutchfield Customer Review (What's this?)
 
Replaced my blown stock sub in my 05 wrangler. Fit great with a few adjustments. Sounds great! Very pleased. Looking forward to putting a aftermarket amp to it.
1 out of 1 people found this helpful
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5 out of 5

Big boom

Written By P.F., Branford,CT. on Friday, March 21, 2014
Crutchfield Customer Review (What's this?)
 
Great Bass!
Pros:
Deep bass for the buck.
Cons:
None
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5 out of 5

better then expected!

Written By tyler, maryland on Sunday, March 16, 2014
Crutchfield Customer Review (What's this?)
 
really good! small break in period I put these in my audi a4 rear deck, had to do a little cutting and shaping but once they were in, it was the perfect combo of bass and speaker if I turned the bass all the way up they get a lot louder then I had previously expected im very happy if I turn the bass down and keep most of the power through the speakers they wint distort or sound bad they fill the car with a soild rumble
Pros:
small factor can fit into a lot of places loudness compared to its small size don't under estimate!!!!
Cons:
I got nothin'
1 out of 1 people found this helpful
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5 out of 5

nice replacement for jeep sub

Written By jerry, lake lure, nc on Thursday, February 27, 2014
Crutchfield Customer Review (What's this?)
 
drop in replacement for blown junk factory subwoofer. other than different mounting hole it was dropin. no cutting of factory plactic enclosure, strip wires and hookup and screw down. simple. easy. pricey but well worth it. factory sub weighs maybe one pound. this sub weighs at 4 pounds plus. and it sounds great.
Pros:
easy install, well built, looks good, great sound
Cons:
none other than price
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5 out of 5

Easy install - TJ

Written By SLO, San Luis Obispo, CA on Monday, January 27, 2014
Crutchfield Customer Review (What's this?)
 
Easy swap for a factory sub in a Jeep Wrangler (TJ). Running off a separate amp - sounds good (for what it is) and is unobtrusive.
Pros:
Easy. Fit with minor cutting in factory enclosure. Sounds good so far.
Cons:
Not incredibly efficient - soaks up power from amp.
1 out of 1 people found this helpful
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5 out of 5

Replacment Jeep Sub

Written By Tomcatta, KCMO on Thursday, November 21, 2013
Crutchfield Customer Review (What's this?)
 
I bought the Kicker 40CWRT672 as a replacement for the factory console mounted sub in my Jeep Wrangler TJ. A much more cost effective replacement solution than the OEM Chrysler part . After some minor plastic trimming (easy) of the factory sub enclosure to clear the larger speaker magnet, it fits perfectly. It would have been nice of Kicker to include some screws to mount the woofer. While still driven by the factory sub amp, this speaker is noticeably better sounding than the OEM unit it replaced. Hopefully, higher build quality will contribute to longevity as well Predictable tight, controlled bass for a small diameter woofer. No complaints whatsoever!
Pros:
Much higher quality than the OEM sub it replaced at a better price.
Cons:
Some mounting screws supplied by Kicker or Crutchfield would have been nice.
5 out of 5 people found this helpful
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4 out of 5

Replacement in Jeep Wrangler

Written By DanG, Tucson, AZ on Monday, November 18, 2013
Crutchfield Customer Review (What's this?)
 
After blowing the stock woofer located in the center console I stepped up to this much better after market woofer. Like many others I'm using the stock amp but notice a much improved sound. The install was easy and required minor tools and very minor trimming of the 'fins' inside the center console housing. Highly recommend this has a drop in replacement.
Pros:
Amazing sound comes from such a small package Dual voice will support future changes, clear that other parts of the system should be upgraded also
Cons:
None
4 out of 4 people found this helpful
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5 out of 5

Kicker 40CWRT672

Written By Anonymous, Flint mi on Wednesday, October 23, 2013
Crutchfield Customer Review (What's this?)
 
Used this to replace factory sub in center console of my 01 jeep wrangler. Still used the factory amp, since this is a dual voice coil sub. Awesome! Best improvement to my sound.
5 out of 5 people found this helpful
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5 out of 5

Small sub packs a big punch

Written By Adam M, Cincinnati, OH on Friday, October 18, 2013
Crutchfield Customer Review (What's this?)
 
I ordered this speaker as a direct replacement for the Harman Kardon stock 6" subwoofer in my BMW M roadster. Upon receiving it (in a mighty small box, I might add) I was immediately impressed with the build quality, it was an extremely good-looking, solid little speaker, I hated that I was going to hide it in between the seats! Upon installation I took it easy and gave it time to break itself in. By the end of a long road trip, it was beginning to impress me, and two weeks later it still is. Awesome sound from such a tiny speaker, and it's worth mentioning that I am still using the stock enclosure and amp, which are likely limiting its full potential. Looking forward to replacing the amp down the road and really seeing what this thing is capable of, but do not hesitate to buy if you are in the market for a small subwoofer, this thing is the business.
Pros:
Very slick design, versatile and powerful.
Cons:
Nothing yet
2 out of 2 people found this helpful
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5 out of 5

Nice Clean Thump

Written By Shane M, Small Town, Michigan on Saturday, August 17, 2013
Crutchfield Customer Review (What's this?)
 
I purchased this speaker as a replacement for the factory sub (which failed) in the factory center console of my 2004 Jeep Wrangler. The fit requires some trimming of the interior support ribs which took me about 5 minutes to accomplish with a Dremmel Tool, you will have to drill 4 new speaker mounting screws as well. The fit looks factory and the sound is far superior to what the factory speaker put out. I used the factory amp as well wired up on the 2 ohm side and am very pleased with the clarity, price and performance of the speaker. For a small sub it hits pretty good and sounds nice and clear with the factory radio/amp set up. I would and have recommended this to every Wrangler owner I know.
Pros:
Sound, Price and ease of installation
Cons:
As stated above the only con I have for this speaker is the very minor work required to install in my Wrangler!
7 out of 7 people found this helpful
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5 out of 5

Great bass for such a small sub

Written By Pete, Encinitas, CA on Friday, August 09, 2013
Crutchfield Customer Review (What's this?)
 
This is a great little sub. I have a Viper and there's not much room for a sub, so I tried one of the self comtained amp+sub boxes that fit under the seat. Sounded awful. Replaced the factory 6 1/2" with this little guy and now I'm going to have to insultate and tighten everything down because it rattles the car pretty good.
Pros:
Great sound for a small sub
Cons:
None
1 out of 1 people found this helpful
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5 out of 5

Kicker 40CWRT672

Written By rmd, el paso tx on Saturday, August 03, 2013
Crutchfield Customer Review (What's this?)
 
installed in 2002 jeep good fit nice sound
2 out of 2 people found this helpful
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5 out of 5

Shocker!

Written By SilverBack1975, Maryland on Friday, June 21, 2013
Crutchfield Customer Review (What's this?)
 
This subwoofer was worth the wait! Once it was in stock I got it the next day. It fits great in the stock enclosure in the armrest of my 2005 Jeep Wrangler Unlimited. You will have to use a dremel tool or diagonal pliers and nip away at the plastic webbing inside the enclouse, about 3/4 of an inch. The sub drops right in and redrill the holes. Compared to the factory subwoofer is night and day. This tiny sub hits hard for being only 6 3/4". It will set off car alarms a block away or give people in the car next to you heart palpitaions, but it will shake your mirrors. I am very happy with this purchase.
Pros:
Amazing little subwoofer! Easy to install and wire up. It took less than 1hr from start to finish.
Cons:
None really could have sent 8 screws in the pack not just 4.
4 out of 4 people found this helpful
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1 question already asked

Can you put a 4 ohm amp on this or does it have to be 2 ohm? [ Mark  Mar 19, 2014 ]
1 answer
  • Thanks for your question. For information on selecting the best amp for your subs I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They will be able to help determine the differences between the amp models and help you make the best choice for your system. [ Krissy Staff  Mar 19, 2014 ]

Add accessories for the Kicker 40CWRT672

It's critical to have good wire, and none is included with the sub. See all categories & accessories

T-Spec 12-gauge Speaker Wire Black/white jacket — priced per foot
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T-Spec 16-gauge Speaker Wire Black/white jacket — priced per foot
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Stinger PRO Series 16-gauge Speaker Wire Black jacket — priced per foot
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Dynamat SuperLite Tri-Pak Triple package — 3 sheets, 12 square feet (Model #10612)
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Dynamat Xtreme Trunk Kit 5 sheets, 20 square feet
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Dynamat 19100 License Frame Kit
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Dynamat Xtreme Wedge Pack 1 sheet, 4 square feet
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Dynamat Dynaliner One 54" x 32" sheet (1/8" thick)
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Kicker GR650 6-1/2" round subwoofer grille
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Bojo Trim Panel Tools Set of 6 pry tools — helps remove interior and exterior trim and door panels
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S&G Wire Cutter/Stripper Tool Cuts and strips 12- to 22-gauge wire
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Pro.Fit Wire Worm Installation tool helps route wiring through tight spaces
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Bojo Trim Panel Tools Set of 6 pry tools — helps remove interior and exterior trim and door panels
2 people say
Your Price: $29.99
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Polyester Fiber Stuffing Make your subwoofer think it's in a bigger box (1-pound pack)
33 people say
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Metra Speaker Terminal Round terminal cup with binding post connectors (for do-it-yourself box builders)
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Metra Speaker Terminal Square terminal cup with binding post connectors (for do-it-yourself box builders)
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Metra Speaker Terminal Round terminal cup with spring clip connectors (for do-it-yourself box builders)
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Metra Speaker Terminal Square terminal cup with spring clip connectors (for do-it-yourself box builders)
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Autosound 2000 Disc One Low Frequency Test CD (Disc One)
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For a more in-depth review and enhanced detailed information on the Kicker 40CWRT672, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_2064CRT672/Kicker-40CWRT672.html ).