Skip Navigation

Kicker 40CWRT81

CompRT shallow-mount 8" subwoofer with dual 1-ohm voice coils

12 Reviews | 5 questions - 9 answers

Item # 2064CWRT81

This item is no longer available.

Shop all Component Subwoofers

Overview

Our take on the Kicker 40CWRT81

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 40CWRT81 8” 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.

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 40CWRT81 8” 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 40CWRT81

This sub clocks in at less than 3" deep.

Built with boom in mind

The 40CWRT81 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 300 watts RMS so make sure you've got a solid amp to power it. You can wire the dual voice coils for either 2- or 1/2-ohm total impedance, giving you more wiring options when setting up your system. This versatile sub sounds great in sealed or ported enclosures.

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

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.

I installed this in a 2016 f250 with the sony sytem to replace the sony sub and it is well worth the money! I didn't need to mod the box as some others stated in other reviews and if you don't mind the sub on a slant then the mounting holes line up also.

Lee, Sarasota, FL

What's in the Box:

  • One 8" Dual 1-ohm voice coil subwoofer
  • Kicker logo stickers
  • Manual (English/ Spanish/ German/ French)
  • Template on box

Product Highlights:

  • 8" subwoofer with dual 1-ohm voice coils
  • injection-molded polypropylene cone
  • rubber surround
  • power handling: 300 watts RMS
  • peak power handling: 600 watts
  • frequency response: 30-500 Hz
  • sensitivity: 84.8 dB
  • top-mount depth: 2-5/8"
  • sealed box volume: .20 - 1.25 cu. ft.
  • ported box volume: 1.25 - 1.75 cu. ft.
  • warranty: 1 year
  • Our 60-day money-back guarantee
Reviews

Kicker 40CWRT81 Reviews

Average Customer Review(s):

(12 Reviews)
rewards card

Submit a review and enter to win a $350 rewards card

Review this product

Thanks for submitting your review

Most reviews are processed and published within 5 business days. You will receive a confirmation email once your review has been published.

Your Review

Use the stars below to rate the overall product on a scale of 1-5
1500
Upload your photos

Not visible. Email associated with order.
(e.g., Charlottesville, VA)

Additional Fields (optional)

500
500

By submitting this review, you agree to our terms and review guidelines.

Filter by rating

Customer photos


<< >>
Details

Hands-on research

Product Research

Features

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

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: 0.2 ft³
  • Maximum Enclosure Volume: 1.25 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 a 8" x 1.5" x 20.75" slot port
  • Maximum Enclosure Volume: 1.20 ft³ with a 8" x 2" x 19.125" slot port

Note: Although smaller than optimal, the prefabricated ported 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.

Accessories
Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

It was the only sub that met my criteria for this build. Works in a small sealed enclosure, quality, reasonably priced and good power handling (rms) compared to other similarly sized shallow subs. [ Christopher  May 03, 2016 ]
Compact and powerful, was easy to match to one of Kicker's amps. Should be perfect fit for what I need [ Chad  Mar 03, 2016 ]
With online chat [ kimberly  Feb 22, 2016 ]

5 questions already asked

You can check to see if this will fit your vehicle by using our Outfit My Car tool: http://www.crutchfield.com/car/carselector.aspx For additional details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle. [ Krissy  Feb 05, 2016 ]  Staff
Iam unaware of the article you are talking about but from my knowledge if you wire the amp and sub correctly the 350w rms will be fine for the 300w rms sub just don't over power your gain and bass booster and you should be fine i did own these subs and did like them but i had to go back to a shallow mount 12 for the lower bass. i feel a 10 or 12 is my best choice. good luck [ SEAN  May 14, 2015 ]
SO, dunno how the wiring layout affects the mount, but i would say this, if you're running that kicker in a shallow mount sealed, which i am. Underseat, braced1/2 mdf appx 4x12x22 if mem serves. Driven by a JL 5channel sounds great, the rub. The kicker is the 2nd driver in that box. Its been holding up, the first {cant remember brand) cooked. I am not hitting the kicker with 350, proly not eve 200, so, my advice is do a ported enclosure to use that much power [ Michael  May 14, 2015 ]
You can always turn down the power of an overpowered amp, the reverse is not sure. Good luck! :). [ JEFFRI  May 14, 2015 ]
I forwarded your question to an Advisor and they responded with the following: The Kicker 40CWRT81 subwoofer with dual 1-ohm voice coils would be an appropriate replacement sub for the factory subs in the front doors of the your Mustang. And there are two sets of speaker wires in each door, one set for each voice coil. We don't have an installation wiring harness to plug them into the factory plugs, so you'll need to cut off the factory connectors and splice the vehicle's speaker wires to the new speaker wires. If you would like to discuss further you can contact an Advisor directly by phone (1-800-324-9695) or online chat. [ Krissy  Jun 05, 2014 ]  Staff
In installed in a Toyota 4Runner so I don't know. [ Susan  Jan 14, 2014 ]
This will depend largely on which factory system you have in your vehicle. For details on installation please contact an Advisor by phone or online chat. They will be able to pull up your vehicle and give you the details on what you will need for an installation. [ Jeff  Jan 13, 2014 ]  Staff
Justin, personally I for two subs, I'd go with the dual 1 ohm for each sub and wire them in a series . This would double the value (ohm) for each. So if you have a dual 1 ohm sub, the amp will see it as a 2 ohm load. Therefor if you have two dual 1 ohm subs (each wired in a series) you could then bridge them so the amp will see a 1ohm load or just wire regular, most newer mono amp bridge internally. Make sure your amp is stable to 1 ohm. Good luck with your install! [ Chris  Mar 05, 2014 ]
Hi Justin. In general you would want to look for an amplifier that would provide about 800 watts RMS. Feel free to contact an Advisor by phone or online chat to discuss exactly which amp will work best for your system and budget. [ Jeff  Dec 11, 2013 ]  Staff
Articles