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Kicker 40CSS684

6"x8" component speaker system

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Our take on the Kicker 40CSS684

by John Pollard
Kicker

Why install component speakers?

A component speaker system gives you the best possible performance from your car audio system. A system consists of separate woofers, tweeters, and crossovers, each designed to cover one specific range of frequencies. As separate components, the woofer can move freely to deliver more powerful performance, while the tweeter can be custom-mounted in a better spot up closer to your ears, revealing a whole new world of detail. Separate crossovers are far superior to the simple filters wired into full-range speakers, so the components work together for smoother, more focused sound.

It's time for an upgrade

Upgrading the old factory speakers in your car will give you a huge bump in sound quality, and Kicker designed CS Series speakers to get your sound system rockin' without breaking the bank. You'll enjoy your music even more when you hear all the details that your muddy-sounding factory speakers couldn't begin to reproduce.  

Bring on the treble and the bass

Kicker's 40CSS684 component speaker set provides low-end from a tough 6"x8" polypropylene woofer, with a polyester foam surround that will stay strong for years to come. The separate 3/4" titanium dome tweeter takes care of the vocal and instrumental details that'll really bring your music to life. The outboard crossover network allows you to pick from three different tweeter level settings so you'll get balanced sound wherever you're sitting.

See more info on this item

Highlights:

  • component speaker system includes 2 woofers, 2 tweeters, and 2 crossovers
  • 6"x8" polypropylene woofers with polyester foam surrounds
  • 3/4" titanium dome tweeters
  • external crossover network with 3 tweeter levels (0, +3, +6 dB)
  • power range: 2-75 watts RMS (225 watts peak power)
  • frequency response: 40-21,000 Hz
  • sensitivity: 90 dB
  • top-mount depth: 2-5/16"
  • warranty: 1 year
  • Our 60-day money-back guarantee

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

Features and Specs
General
Speaker Size
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6X8
Design
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2-way
Tweeter Design
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3/4" Dome
Tweeter Composition
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Titanium
Woofer Composition
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Polypropylene
Woofer Surround
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Polyester Foam
Parts Warranty
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1 Year
Labor Warranty
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1 Year
Specifications
Sensitivity
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90 dB
Frequency Response
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40 - 21k Hz
RMS Power Range (Watts)
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2-75
Peak Power Handling (Watts)
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225
Impedance (Ohms)
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4
Top-mount Depth (Inches)
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2 5/16
Bottom-mount Depth (Inches)
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2 11/16
Cutout Diameter or Length (inches)
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0
Product Research
What's in the box?

Download owner's manual

  • Two woofers
  • Two tweeters (each with 35" Wire attached)
  • 2 Crossovers (each with 35" Input wire/ 35" Tweeter output wire/ 35" Woofer output wire attached)
  • 2 Flush mount tweeter rings
  • 2 Short tweeter mounting nuts
  • 2 Long tweeter mounting nuts
  • 2 Back angled tweeter rings
  • 2 Front angled tweeter rings
  • 2 Angled surface mount tweeter housings
  • Twelve 1" Self-tapping screws
  • Two 5/8" Self-tapping screws
  • 8 Speed clips
  • Four 7" Zip-ties
  • 4 Red plastic butt connectors
  • Owner's manual (English/ Spanish/ German/ French)

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

Polypropylene Woofer Cones: The Kicker CS-series speakers feature durable polypropylene woofer cones, resistant to the moisture and temperature extremes found in automotive applications.

Woofer Mounting Applications: While Kicker describes this speaker as a 6x8, it also fits many 5x7 applications. Please check the Crutchfield Vehicle Selector to confirm fit.

Ribbed Polyester Foam Surrounds: The ribbed polyester foam surrounds allow extended cone excursion for additional bass output and higher SPL.

Tweeter Mounting Options: The tweeters come with brackets to allow multiple mounting configurations: flush-mounted, angled flush-mounted (approximately 10°), and angled surface-mounted (approximately 15°).

Tweeter Dimensions:

  Flush Mount Angled Flush Mount Angled Surface Mount
Mounting Height 0.238" 0.563" 1.272"
Depth 0.532" 0.612" 0.554" (screw depth)
Frame Diameter 1.976" 1.976" N/A
Cutout Diameter 1.57" 1.587" N/A
Frame Width N/A N/A 1.688"
Frame Length N/A N/A 1.897"

Crossovers: The component system includes passive 2-way crossover networks for a seamless transition between the woofers and tweeters. The slope is 12dB per octave (both high pass and low pass) and the crossover point is 4000 Hz. A switch on each crossover allows you to set the tweeter output; 0 dB, +3 dB, or +6 dB. The crossovers' input and output wires are attached; the woofer output has quick slide terminals that connect directly to the woofer and the tweeter output has bullet terminals that mate to the terminals on the tweeter wires. The crossovers' dimensions are:

  • Length: 4.595"
  • Width: 2.463"
  • Height: 1.004"
 

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Kicker 40CSS684 Reviews

Average Customer Review:

29 people say:

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5 out of 5

Kicker 40CSS684

Written By BrentN, McPherson,Ks on Monday, August 25, 2014
Crutchfield Customer Review (What's this?)
 
Sounds good, better than the old factory stuff, had to improvise a little on the tweeters, but woofers went right in.
Pros:
better sound
Cons:
none
Was this review helpful?    Yes | No
 
5 out of 5

Kicker 6x8

Written By Jared, Hollister, CA on Monday, August 18, 2014
Crutchfield Customer Review (What's this?)
 
Sounds great, and easy install in my 2006 Ford F-150. the tweeters were a bit large but i managed to us a dremel to make them fit nice and snug in the door, also looks great. Crossover was a bit hard to find a location for, but thats my vehicle problem, the crossover is fairly small in size.
Pros:
easy install, great sound, great price
Was this review helpful?    Yes | No
 
5 out of 5

Kicker Speakers

Written By Jonathan, Frostburg, MD 21532 on Sunday, August 10, 2014
Crutchfield Customer Review (What's this?)
 
I absolutely love my Kicker speakers for my Miata MX-5. They fit perfectly, sound amazing and were easy to install.
Was this review helpful?    Yes | No
 
5 out of 5

KIicker 6x8 Yellow Series

Written By Gavin T., monroeville, NJ on Monday, August 04, 2014
Crutchfield Customer Review (What's this?)
 
Great base with clear crisp sound from the tweeters.
Pros:
Great sound for a reasonable price
Cons:
None
Was this review helpful?    Yes | No
 
5 out of 5

Great speakers

Written By Marisa, Summerville,SC on Wednesday, July 30, 2014
Crutchfield Customer Review (What's this?)
 
Great component speaker set, the sound is amazing and clear. It was a little too advanced for me to put in myself, so I let the professionals do it. Honestly, worth every penny for these speakers.
Pros:
Loud, clear, quality
Was this review helpful?    Yes | No
 
5 out of 5

Speakers

Written By Mike, Lacey, Washington on Thursday, June 26, 2014
Crutchfield Customer Review (What's this?)
 
Speakers are great for the price.
Was this review helpful?    Yes | No
 
5 out of 5

awsume

Written By MikeV, Babylon NY on Thursday, June 26, 2014
Crutchfield Customer Review (What's this?)
 
Added these kickers in my Ford Ranger sounds amazing.
Pros:
Adding tweeter higher up to ear leavel bings music to life
Cons:
None
Was this review helpful?    Yes | No
 
5 out of 5

Kickers F&R

Written By FullThrottleCottle, Sanford Fl on Thursday, June 26, 2014
Crutchfield Customer Review (What's this?)
 
Replace the front and rear factory speakers and my 1990 9F word 350 super cab. Added the kickers with a separate tweet with the splitter in the front factory size front and rear sounds great cannot wait to get in dash GPS, amp and bass. Everything was shipped as promised installation was a breeze as promised.
Pros:
Crutchfield suggested this speaker set, said it would sound great and it does. One of the few things that I've stayed in budget on repairing my truck.
Cons:
none
Was this review helpful?    Yes | No
 
5 out of 5

Great Product

Written By Robin, Georgia on Tuesday, June 10, 2014
Crutchfield Customer Review (What's this?)
 
Great product, easy to install. Much needed improvement over factory speakers.
Pros:
everything
Cons:
nothing
Was this review helpful?    Yes | No
 
4 out of 5

Kicker 40CSS684

Written By Anonymous, Chesapeake, VA on Wednesday, June 04, 2014
Crutchfield Customer Review (What's this?)
 
Installed Kicker speaker system in my 2007 Mazda Miata. Overall, installing the speakers in the doors is not overly difficult, in spite of less than optimal directions. Crossover installed nicely. Tweeter installation proved the most difficult as the stock tweeters are built into the stock tweeter mount. I called tech support, but they didn't have a viable install alternative. I ended up using the existing mount and traced out the Kicker tweeter. Using a circular core bit, I cut out the hole for the Kicker tweeter which allowed for the tweeter to be mounted perfectly. Recommend installing speaker baffles. Speaker system sound is very good with the top down.
Pros:
Solid sound system. As always, tech support is great.
Cons:
Installation instructions for the tweeter could be improved.
Was this review helpful?    Yes | No
 
4 out of 5

NC MX-5 Miata

Written By Scott, Alexandria, VA on Friday, May 30, 2014
Crutchfield Customer Review (What's this?)
 
Installed these in the doors of a 2012 MX-5. The woofers fit well. I mounted the tweeters to the door where the factory tweeter grill is located (the factory tweeter is mounted to the plastic door trim) using heavy duty dual sided tape paired with a sheet metal screw in the Kicker mounting bracket. Lined the doors with light weight Dynamat (not sure how much that did). They sound good. They've burned in well, and the factory head unit powers them fine. I get much better response when I'm running my iPhone through the aux at full volume output. I imagine with an aftermarket amp they would only sound better.

They have made it possible for me to crank music at full range with the top down and have it not sound like a phonograph in a tunnel like the factory speakers did.

I'm knocking a star because I had to get a second set sent to me; one of the woofers was distorted at low volume levels. The second set resolved the issue, and the install finished up fine over two weekends between sets. The folks at Crutchfield came through with their over-the-phone install support. As always, thanks guys.
Pros:
Better than factory speakers Relatively easy install Crossover adjustable frequency response
Cons:
Flawed initial woofer
2 out of 2 people found this helpful
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5 out of 5

Kicker 40CSS684

Written By Charlie, Texas on Tuesday, March 18, 2014
Crutchfield Customer Review (What's this?)
 
Bought these to put in my son's 2006 Ford F150 FX4. The mids fit perfectly. All I had to do to fit the tweeters was to trim the bottom of the factory tweeter hole by 1/6th on an inch. I placed the crossovers inside the armrests. Perfect hiding place for them and easy access if you ever need to get to them. Work great with a 10' sub under the back seat.
Pros:
-Great Value for the Money
Cons:
-None
2 out of 2 people found this helpful
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5 out of 5

great

Written By nigknog, great bend ks on Saturday, March 15, 2014
Crutchfield Customer Review (What's this?)
 
great sound
Was this review helpful?    Yes | No
 
5 out of 5

awesome speakers

Written By brian, toledo oh on Saturday, February 22, 2014
Crutchfield Customer Review (What's this?)
 
Bought to replace stock speakers in a '12 F150 and they sound amazing. Even running off the stock head unit they sound so much better than stock.
Pros:
easy to install. May options for tweeter mounting
Cons:
none
1 out of 1 people found this helpful
Was this review helpful?    Yes | No
 
5 out of 5

Kicker 40CSS684

Written By Anonymous, Chester, MD on Wednesday, February 19, 2014
Crutchfield Customer Review (What's this?)
 
Very good quality
Pros:
Goes well with subs
Was this review helpful?    Yes | No
 
5 out of 5

Kicker 40CSS684

Written By Anonymous, Hillsborough, NC on Monday, February 10, 2014
Crutchfield Customer Review (What's this?)
 
Easy install Fantastic sound
1 out of 2 people found this helpful
Was this review helpful?    Yes | No
 
5 out of 5

Kicker 40CSS684

Written By Anonymous, Savannah, GA on Saturday, January 04, 2014
Crutchfield Customer Review (What's this?)
 
Just what my Ford F 150 needed. The sound is great and it was a easy installation!
Was this review helpful?    Yes | No
 
5 out of 5

easy installation and great sound

Written By allen, Rockmart Ga on Thursday, January 02, 2014
Crutchfield Customer Review (What's this?)
 
these speakers sound way better in my f250 than i expected. I would recommend these speakers
Was this review helpful?    Yes | No
 
4 out of 5

Good Overall

Written By ac, Bakersfield, Ca on Thursday, December 05, 2013
Crutchfield Customer Review (What's this?)
 
Installed these speakers in my F-250. Sound much better than the original speakers. Had to drill a hole for the tweeters but the extra sound was worth the extra work. Sound good at low to moderate volumes, at high volumes the bass is distorted, will have to put in a sub in the near future so I can decrease the bass to the speakers.
Pros:
Easy install, great highs
Cons:
Finding a good spot for the eternal box where it will not rattle can be a bit of a challenge
Was this review helpful?    Yes | No
 
4 out of 5

so far so good

Written By Anonymous, Goose Creek, SC on Sunday, November 10, 2013
Crutchfield Customer Review (What's this?)
 
I have the Kicker 40CSS684 and the Kicker 40CSS654 in my car. I cant hear the difference between them so this review stands for both.
Pros:
Easy to install. The wires from the crossover to the speakers have different connections so there is no way to mix them up. They put out a surprising amount of bass for their size. I still will put in subs anyway because im sure heavy bass through these will decrease their life. I listen to metal, rock, country, rap and electronic or dubstep and these speakers perform flawlessly in my opinion.
Cons:
The tweeters are a little loud even on the +0 setting on the crossover. There is no need for the other settings. Buy other crimp connections to connect to the input wire, the ones they give are useless. Needed to adjust the higher frequencies down in my equalizer because they were too high. That may just be my specific application though.
1 out of 1 people found this helpful
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5 out of 5

Awesome Product!

Written By Pete K, Tampa Bay, FL on Wednesday, November 06, 2013
Crutchfield Customer Review (What's this?)
 
I replaced my JVC speakers in my 95 GT Mustang with this product. For unbelievable sound, take the time to run new speaker wire to your amplifier or head unit instead of using the factory wiring harness. These speakers are very crisp with the proper accessories!
Pros:
Ease of installation; crisp sound
Cons:
None noted!
1 out of 1 people found this helpful
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5 out of 5

2013 Mustang GT 4 Speaker setup

Written By OLD DUDE, Odessa TEXAS on Monday, August 26, 2013
Crutchfield Customer Review (What's this?)
 
It's been awhile since I've installed any audio upgrades to a car. So many choices now. This kit took the guess work out of the whole thing. These are a great way to upgrade with out breaking the bank. I haven't been a bass head in a while. Now I'm just looking for great clear sound. Kicker delivered on this kit. Everything you need you get. Great sound, clear, nice mids, and still good bass. Took a little longer than it use to but it's a new car and I didn't want to scratch it up. Around three hours. Just what I was looking for thanks Crutchfield.
Pros:
Every thing you need in one box. They sent wire harnesses to fit my mustang didn't see that coming. Was a huge help. Great sound huge upgrade from factory 4 speaker set up.
Cons:
Only one con. Had to trim a little plastic off the mount in the door. Not a huge problem but worth bringing up.
8 out of 8 people found this helpful
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5 out of 5

Excellent Speakers

Written By Boo4ya99, Zephyrhills, FL on Thursday, August 08, 2013
Crutchfield Customer Review (What's this?)
 
I bought these Kickers for the front doors of my 07 F150 FX2. I was able to utilize the factory tweeter holes and the crossover fit perfectly underneath the window switch panel. These speakers perform just as I'd hoped they would!! Money well spent!!
Pros:
Loud, crisp highs and clear mid bass
Cons:
It can be tough to find a spot to mount the crossover if you happen to have small door space to work with.
1 out of 1 people found this helpful
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5 out of 5

Excellent step up from factory

Written By rinos88, Marquette Heights, Illinois on Tuesday, July 23, 2013
Crutchfield Customer Review (What's this?)
 
I put these in my 2002 Mustang GT to replace the stock speakers. The clarity is amazing. I can hear a level of detail that I have not heard before in a lot of the music that I've listened to for years. I'm also able to turn my head unit up quite a few notches higher than I could with my stock speakers. I have the high pass filter set at 50hz and they handle everything down to that frequency quite well. I'm running them off of my head unit and they sound amazing.
Pros:
Great price, perfect fit, awesome clarity and punch. They sound amazing, even without an amp pushing them.
Cons:
The instructions on how to change the different tweeter attachments are extremely vague, considering that the ones that come on them seem to have been put on super tight, as if done by a gorilla on steroids. I nearly had to use pliers to change to the flush mount setup.
2 out of 2 people found this helpful
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4 out of 5

Decent factory replacements - however, consider the 6 1/2" if you can

Written By TravisG, Meridian, MS on Tuesday, July 16, 2013
Crutchfield Customer Review (What's this?)
 
I bought these as a factory replacement for an 04 f150. My truck had just the basic sound speakers. But the access is easy to get to IF you're just replacing the factory speakers with a 6x8 woofer. The grill pops off and you can just unscrew them and pop in the new ones without removing the door panel. However, with the component systems you need to take the door panel off of course. There was already a hole for a tweeter in the door panel behind the speaker grille, so i just used it, it was a perfect fit. Probably not ideal mounting location, but I won't have this truck forever so I didnt want to drill holes all in it and route wires and stuff. The crossover was tricky to fit because of how the door panel is made. But I drilled a hole and mounted it in-between the tweeter and woofer locations and it fit fine enough. Since the grille covers that whole area, you can't see the screws I put in. SO for a Ford, this is a good system.......otherwise go get the 6 1/2;s and use an adapter bracket if you have to - because they're more powerful and handle more wattage...... I actually have the Kicker 6 1/2 components in my wife's car, they sound better even though it was a harder install to do. All in all for a single cab pick up, they put out good sound, loud as I can handle anyway and have good highs/mids and okay bass considering I don't have a sub yet. I was actually impressed with it for not having a sub. I put regular Kicker 6x8s in the back doors, easy breezy, took 5 minutes.
Pros:
Fits well in Fords and other vehicles with 6x8's - was able to use factory woofer and tweeter holes with no adapters, no drilling. I gave it 4 stars for easy installation.
Cons:
Not as powerful as the 61/2 component system Crossover is just kinda big and bulky, without a lot of mounting options. it'd be cool if there was a way to remotely change the db settings on the crossover without having to remove the darn door panel again....or having it mounted externally inside your car. i took the 5th star away for the lack of power handling compared to other sizes of the same product.
1 out of 1 people found this helpful
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4 out of 5

Kicker 40CSS684

Written By Chase, Danville Ky on Tuesday, June 25, 2013
Crutchfield Customer Review (What's this?)
 
I put these in the front doors of my 2004 F150 supercab and they fit great. The rear said they'll fit; I wasn't able to get the whole system in behind the factory grilles. The tweeter is mounted outside and still looks clean. I like great sound (the reason for components in the front and rear doors). I like the way these components sound. They have some good mid level bass but can keep up with high notes as well.
Pros:
Lots of range and great sound.
Cons:
Didn't fit as well as I had hoped in the rear cab doors; but I'm still satisfied with the end results.
1 out of 1 people found this helpful
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5 out of 5

Perfect

Written By Jason G, Denver CO on Tuesday, June 04, 2013
Crutchfield Customer Review (What's this?)
 
They are perfect in my case because of their fit in my Ford Fusion. I was able to mount the crossover next to each of the 6x8 for a clean look. Also in a good spot for servicing and adjusting gain since popping off the door panels are easy.
Pros:
Sound
Cons:
None
Was this review helpful?    Yes | No
 
4 out of 5

"Great Sound"

Written By Mike Y, Hilo, Hawaii on Thursday, May 02, 2013
Crutchfield Customer Review (What's this?)
 
Simple installation and great sounding results is what I got. Clear and clean.
Pros:
Easy installation and great sound
Was this review helpful?    Yes | No
 
5 out of 5

Kicker 40CSS684

Written By Art, Riverbank Ca on Saturday, March 23, 2013
Crutchfield Customer Review (What's this?)
 
I put these speekers in my wife's vehical, she was very impressed.
Was this review helpful?    Yes | No
 

2 questions already asked

What size amp and what amp? [ Ron  Aug 25, 2014 ]
1 answer
  • Thanks for your question. For information on selecting the best amp 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  Aug 25, 2014 ]
I was wondering what size hole I would have to cut to install my tweeters? [ Adam  Apr 18, 2014 ]
2 answers
  • 1.57" for surface mount. [ MARK   Apr 25, 2014 ]
  • This will depend largely on your vehicle. For details on 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 what you will need for an installation. [ Krissy Staff  Apr 21, 2014 ]

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For a more in-depth review and enhanced detailed information on the Kicker 40CSS684, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_2064CSS684/Kicker-40CSS684.html ).