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Kicker 40CWR84

CompR Series 8" subwoofer with dual 4-ohm voice coils

15 Reviews | 3 questions - 5 answers

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Item # 20640CWR84

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Our take on the Kicker 40CWR84

Kicker designed their CompR line of subs for people who love to hear strong bass when their music's playing. Built from the ground up with performance in mind, these subs handle plenty of power to give you the baddest bass available from the legendary Comp line.  

Brace yourself 

Kicker designed their CompR line of subs for people who love to hear strong bass when their music's playing. Built from the ground up with performance in mind, these subs handle plenty of power to give you the baddest bass available from the legendary Comp line.  

Kicker 40CWR84

Change this subwoofer's impedance with a flick of the built-in switch.

Overbuilt? More like built just right

Kicker's 40CWR84 8” subwoofer comes equipped with a tough, polypropylene cone that stays rigid during intense play sessions so you hear accurate bass. A custom-designed back and top plate give the woofer plenty of room to travel, while the durable rubber surround helps to control cone movement during a heavy workout. This sub uses extensive venting in its heavy steel basket to shrug off heat, so you can count on reliable performance.   

Say hello to system flexibility

This Kicker CompR will handle up to 300 watts RMS so make sure you have an amplifier that'll do it justice. Its dual 4-ohm voice coils make it easy to connect to a mono amplifier, and this versatile sub works well in sealed or ported enclosures.

To drive this single subwoofer, we recommend a mono amplifier rated between 225 and 450 watts RMS at 2 ohms. For more information, please refer to our article on How to Match Subwoofers and Amplifiers.

Nice little sub, just installed it so I didn't get to play with it too much.

Anonymous, Wisconsin

Featured Video:

What's in the Box:

  • One 8" Dual 4-ohm voice coil subwoofer (with impedance switch)
  • Kicker logo stickers
  • Manual (English/ Spanish/ German/ French)
  • Template on box

Product Highlights:

  • 8" subwoofer with dual 4-ohm voice coils
  • injection-molded polypropylene cone
  • rubber surround
  • power handling: 100-300 watts RMS (150 watts per coil)
  • peak power handling: 600 watts
  • frequency response: 30-500 Hz
  • sensitivity: 82.8 dB
  • top-mount depth: 4-1/8"
  • sealed box volume: .35 - 1.8 cu. ft.
  • ported box volume: .65 - 1.2 cu. ft.
  • warranty: 1 year
  • Our 60-day money-back guarantee

Kicker 40CWR84 Reviews

Average Customer Review(s):

(15 Reviews)
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Hands-on research

Product Research


Dual 4-ohm Voice Coils: This woofer features dual 4-ohm voice coils, offering wiring flexibility. A switch on the speaker terminal allows you to easily change from parallel (the woofer presents a 2-ohm load) to series (the woofer presents a 8-ohm load) wiring for the voice coils.

UniPlate Construction: The woofer features a one-piece UniPlate construction with a vented, extended pole piece and backplate. This unique design provides the following benefits:

  • Optimizes heat transfer efficiency for cooler operation
  • Eliminates erratic magnetic flux in the voice coil gap
  • Releases pressure under the suspension for uniform cone movement
  • Prevents the voice coil from bottoming out, and the resulting damage

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

Enclosure Compatibility

Sealed Enclosure Applications: Sealed enclosures provide the most control over a woofer and provide accurate sonic reproduction, making them suitable to all types of music. Kicker recommends sealed enclosures in the following range:

  • Minimum Enclosure Volume: 0.4 ft³
  • Maximum Enclosure Volume: 1.8 ft³

Vented Box: Vented (or ported) enclosures typically provide better overall efficiency than sealed so they are suitable for use with smaller amplifiers, giving you more bass output from less power. Kicker recommends ported enclosures in the following range:

  • Minimum Enclosure Volume: 0.8 ft³ with an 8" x 1.5" x 20.75" slot port
  • Maximum Enclosure Volume: 1.2 ft³ with an 8" x 2" x 19.125" slot port

Note: Although smaller than optimal, the prefabricated enclosures we list on the accessory page produce very good results.

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 verify what’s in the box, 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.

Staff Reviews

Product reviews from the Crutchfield Labs

Kicker's CompR and CompRT subwoofers, plus their KX amplifiers, give you the sound and performance you expect from Kicker when you're building a car audio system.

What are the Labs?
Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

Supposedly fits in the rear panel of my 2013 Honda Odyssey EX-L. Hopefully that's true! [ David  Jan 18, 2016 ]
It should be small enough to fit behind my single cab s10 without sacrificing much space at all. [ ALBERT  Dec 24, 2015 ]
Rms power handling good for speaker size [ Joseph  Dec 19, 2015 ]
I love kicker quality [ James  Dec 16, 2015 ]
Price plus value your company rocks still waiting for my jbl speakers [ Sal  Dec 15, 2015 ]

3 questions already asked

I don't know enough about the bazooka amplifier to answer this. Reason is the speaker in question is a dual 4ohm voice coil style speaker. This means you can run it as an 8ohm load or 2 ohm load. Can your amplifier handle a 2 ohm load? If not an 8ohm load is a bit more. How many watts is the bazooka amplifier? This speaker is 400watts rms. If u can't push at least 300 at an 8 ohm load it won't sound like u want it to in my opinion. I'm running mine with a 300 watt kicker yellow line mono amplifier (cx300.1) at 2 ohm load and it sounds great. Good luck [ matthew  Nov 21, 2015 ]
YES it will! [ BRANNON  Nov 20, 2015 ]
I honestly can't answer this question. I returned this item for a 8 inch powered sub woofer from sound ordnance which I have been pleasantly pleased. I am sure cysteine service can help with this question. Ask for Chris. He is helpful and knowledgable. [ Mark  Nov 20, 2015 ]
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  Feb 17, 2015 ]  Staff
You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility with your factory system. They will be able to pull up your vehicle and see if there is a kit available for you. If there is none, then they may also be able to discuss other options with you. [ Greg  Jul 28, 2014 ]  Staff