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Kicker 40CSS684

6"x8" component speaker system

66 Reviews | 5 questions - 13 answers

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Our take on the Kicker 40CSS684

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.  

Kicker 40CSS684

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.

Installation note: You'll need a pair of our universal backstraps to install the tweeters in the factory locations.

Product 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

What's in the Box:

  • 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)

Featured Video:

Great sound, I'm replaced my stock speakers. I upgraded to these kickers in the front with a tweeter and the sound is just awesome. I also put the speakers baffles in and that was the ticket. I can't wait to upgrade the deck unit with these speakers

Tim, Lovelock, NV


Kicker 40CSS684 Reviews

Average Customer Review(s):

(66 Reviews)

Great replacement speaker

Tim from Lovelock, NV on 4/2/2017

2000 Mazda B Series
Crutchfield Customer Review (What's this?)

Great sound, I'm replaced my stock speakers. I upgraded to these kickers in the front with a tweeter and the sound is just awesome. I also put the speakers baffles in and that was the ticket. I can't wait to upgrade the deck unit with these speakers

Pros: Crystal clear sound and the tweeter hits the note.

Cons: None

Kicker 40CSS684

Jerry from Kailua, HI on 1/6/2017

2010 Ford Mustang
Crutchfield Customer Review (What's this?)

I really like this speaker combo. It puts out some really nice sounds.

Pros: Good price and nice sounding

Cons: none

Kicker 40CSS684

Jeff from Wapakoneta, OH on 10/27/2016

2011 Ford F-150 XLT
Crutchfield Customer Review (What's this?)

Great sound just what my system needed



Great factory upgrade

Rich from Burlington Junction, MO on 10/24/2016

2014 Ford F-150 STX
Crutchfield Customer Review (What's this?)

Definitely a step up from factory speakers. Would be much better with an aftermarket head unit. Does not put out much for bass in a supercab truck. Again only using the factory head unit, an upgrade there would help!!

Pros: Quality is definitely very good.


Sounds Good and has several tweeter mounting options.

SloNEZ from Grand Rapids MI on 6/26/2016

2011 Ford F-150 XL
Crutchfield Customer Review (What's this?)

Installed easily and sounds quite good. Doesn't go terribly loud, but it's clean and tight. One of the tweeters arrived with the negative lead unattached - not broken off, but unattached. There was enough solder on the wire for me to solder this connection myself and all seems to be well. I should point out that Crutchfield Customer Service was willing to replace this part, but I didn't want to delay finishing my install. If my repair doesn't hold up, I'll take them up on their offer. One star off for the defect.

Pros: Easy install with several mounting options included with the tweeters. I went with the surface-mount cups, but may change to flush mount for a cleaner look. They also include what you need for an angled flush mount. Plenty of wire length is included so locating tweeters and crossovers should not be a problem.

Cons: Just the previously mentioned lapse in quality control with the missed soldering connection.

Front doors 2012 F150 Kicker 40CSS684

ws from Green River, Wyo on 5/1/2016

Crutchfield Customer Review (What's this?)

Mids and highs are great but i was expecting a little more bass from the 6x8's. Install was easy. I used the boom mat enclosures in the doors maybe that has changed the sound. May remove them to see if I get more bass. Yes i know they are not high end speakers and maybe I should have gone with a 5.25 or 6.5 to get the sound I was expecting. They are a lot better then the scratchy stock speaker they replaced. **Update 5.08.2016** I removed the boom mats and the sound improved. I would recommend the kickers as a replacement for your stock speakers. And hats off to the customer service for all the help.

Pros: Great mids and highs. Install was easy. Did have to use pumber tape (metal strap w/holes) to mount the tweeters in the "A"pillars. Drilled small holes in doors to zip tie the crossovers to the lower/front corners of the inner door.

Cons: Not impressed with the low end sound. I installed with the boom mat enclosure and what little bass you do get sounds like you are flicking a cardboard box. I did not expect a lot of bass but hoping for a little more then what the 6x8 put out.

Worth it

jay from Daytona Beach, FL on 4/28/2016

2013 Ford F-150 FX4
Crutchfield Customer Review (What's this?)

Nice clean sounds and I've only had them in for about an hour and I can tell the difference. Before the Sony system sounded hollow and echo-y. Now I can actually enjoy my music.

Pros: Cleaner sounds. No more hollow sound

Cons: None

Kicker 40CSS684

Anonymous from Inwood, WV on 4/25/2016

2003 Ford F-350
Crutchfield Customer Review (What's this?)

Sounds great, a Big difference over factory speakers

Pros: affordable

Cons: None

Better than factory

Kelly from graniteville, SC on 3/27/2016

2007 Mazda 3
Crutchfield Customer Review (What's this?)

Got this as an upgrade from my factory speakers. Wasn't as big a sound as I thought it would be, but it still sounds pretty great

Pros: Good quality Easy instructions

Cons: Not as loud as I'd thought it would be

very nice

jeremiah from hill cith mn on 3/21/2016

2008 Ford Escape
Crutchfield Customer Review (What's this?)

I don't believe the sound clarity that comes out of these speakers. It is soo much clearer than the price. extreamly pleased.

Pros: easy to install.

Cons: none.


Anonymous from 06002 on 2/22/2016

2008 Mazda Mazdaspeed3
Crutchfield Customer Review (What's this?)

These speakers are fantastic! Very bright and crisp sound system. Installation was easy, except for the tweeters. I had to do some modifications on my cars panels. This is definitely a huge boost in quality over my crappy paper speakers.



Kicker component speaker system

Mark from ossining, NY on 2/6/2016

Crutchfield Customer Review (What's this?)

This component system provides great sound from my factory radio without any distortion.

Pros: Easy to install and performed as advertised.


Installed in 2012 Mazda MX5

Spindizzy from Tampa, Fl on 1/12/2016

2012 Mazda MX5
Crutchfield Customer Review (What's this?)

My last MX5 had the 7 speaker Boss system and while far from great sounding it was at least tweakable. My new MX5 had the 6 speaker stock system and it was awful, so I replaced the head unit with a nice Kenwood APTX head and was pretty happy with it at lower volumes, but could hear that the stock speakers were now the weaker link in the system. This Kicker component system installed beautifully and really makes the head unit sing. I get decent bottom end (after dampening the doors with Hush mat) and the mids and highs are crystal clear. I needed to set the crossover to 0 Db due to placement of the tweeters high in the doors and they were still a bit shrill, but was able to tune it down a notch with the headunit's eq. Now the system sounds fantastic even at highway speeds with the top down. Very satisfied with all of the components, instructions and Crutchfield. I would purchase these speakers again.

Pros: Easy to mount, very clear sounding at all volume levels, quality build.

Cons: None

Great replacement speakers

Dman from Covington, GA on 12/26/2015

2006 Ford F-150
Crutchfield Customer Review (What's this?)

Bought these component speakers to replace factory ones, simple and easy installation, paired these up with some 2-way speakers for rear doors. I am highly impressed by the clarity of music that these put out, I'm using my factory head unit with no amplifier. These sound great, thank you Crutchfield for fast shipping and great advice



Top Notch

Blacker from Montana on 9/29/2015

2002 Ford F-150
Crutchfield Customer Review (What's this?)

Great overall response with these speakers. The woofers provide good punch for simple door speakers and while the tweeters aren't the most dynamic I've ever heard, they do compliment the woofers well. With my Clarion 7.1 EQ and 4 channel Kicker amp, these fit in perfectly. My biggest complaint is the bands of audio are not separated between the woofer and tweeter enough to meet my desires. That only really shows up when listening to music like dubstep style stuff that will have loose bass with vocals over top. The vocals become badly distorted by the sheer amount of bass coming out of the woofer. The reason why I'm not taking out a star for that is a) If you want a huge amount of punch, get a sub, we all know that, and 2) I have the low end frequencies turned way up on my EQ because I listen mostly to hard rock/heavy metal, so I have the system tuned to that style of music, not dubstep or the kind of music that would product that problem. It wouldn't be an issue at all if the frequencies were better separated amongst the woofer and tweeter, but this is a small thing in the scheme of things. These speakers put out great bass and mids for hard rock and heavy metal.

Pros: Top notch bass and mids for a door speaker, can handle a heavy load, very well worth the price.

Cons: Highs could be much more crisp, frequencies could be separated by the crossover better to maximize the sound, not the cleanest sound I've ever heard.


wQQdsman from Iowa on 9/28/2015

2000 Ford Excursion
Crutchfield Customer Review (What's this?)

Not impressed...I got these based on a recommendation by Crutchfield. At that time, I had my product advisor recommend a complete system, 6 speakers and a head unit. He went with a Kenwood head unit "that I am very pleased with" and six kicker speakers. I mentioned at the get go sound quality was a must. He recommended three pairs of kicker speakers. This component set for the front, a different set for the rear doors and a third different set for the 3rd row. I said and I kicker must have come a long way to be mentioned in the realm of quality sound...I should have listened to my gut my advisor said they are very highly rated and his defense the 2nd row and third row seem to be just fine. But this component sounds like a tin can in the tweeters and the speaker distorts with anything near 3/4 volume from the Kenwood that only pushes 22 per channel?. I have the kenwood set to 5" as it should be..its even worse on any other speaker setting via the headunit. I have pulled the level on the crossover all the way down....middle...and up to top. At top it is miserable,,,at mid level the speaker disappears and all you hear is the over tinny sound of the tweeter and at low the speaker all but disappears and your left with all tin can....If your looking for pure sound quality then I would not recommend this setup. I will most likely give these away to one of the kids at work and purchase something of higher quality.

Pros: I honestly don't have a pro to mention other than price.

Cons: Back to get what you pay for....entry level components. Over tinny for my liking and the sound is not in my realm of quality.

Great for '01 Miata

Dave G from Illinois on 9/26/2015

2001 Mazda Miata
Crutchfield Customer Review (What's this?)

Purchased these Kicker speakers with JVC KW-R10BT head unit to replace factory (non-Bose) system in 2001 Miata (Base non-LS). Installation was easy -- Door panels have opening for tweeter that fit perfectly using a universal bracket along with a couple small screws. Main driver also fit very well with only very minor trimming of OEM protective back cover. Crossover was mounted inside door cavity by drilling a single hole above main speaker and using a small nut & bolt plus heavy duty Velcro. (NOTE: Be careful not to position crossover in path of sliding hinge rail!) Sound quality of this system is outstanding, with plenty of low end and crisp highs - perfect for music I listen to (Classic rock, jazz, acoustic, country, pop). Speakers seem quite efficient -- Volume output is VERY loud using only the stock 22 watt amplifier of the JVC HU! Had purchased outboard amplifier to install, but found it unnecessary.

Pros: Easy installation, excellent sound quality, appear designed to last.

Cons: None to report.

Sound great

BDR from Texas on 9/23/2015

2005 Ford F-150
Crutchfield Customer Review (What's this?)

Installed in 2005 F-150 which came with the "Audiophile" sound system, amazing the difference these speakers make in comparison to what the factory considers an upgraded system. Easy install, the tweeters have a threaded ring/nut to hold them on, so as long as the hole is the right size they attach nicely; no backstrap or other installation device needed. No complaints so far.



Huge improvement over stock.

daniel from Oregon on 7/15/2015

2012 Ford F-250
Crutchfield Customer Review (What's this?)

Much more crisp sound than stock. Love that these are matched components and the equalizers are adjustable to fine tune the sound. I set them on +3db (middle selector), which worked great. I had to do a little custom work to mount the tweeters in the factory locations, on my 2012 Ford Super Duty but it worked great, as did mounting the equalizers, and everything looks stock. These sound great, even with a stock deck. I would highly recommend this balanced set.

Pros: Great sound and relatively easy to install the packaged kit. Much more clarity and crispness than stock components. Good bang for the buck.

Cons: Shipping box was missing one of the harness adapters for the speakers: no big deal, I just used my own connectors and called it good.

Great crisp sound

Alex from Michigan on 7/13/2015

2004 Ford Focus
Crutchfield Customer Review (What's this?)

Installed these in the door panels to upgrade some old 2 way speakers I had moved over from an old car. The improvements are amazing they can take all the power I want to throw at them and are able to produce full base while projecting a great clear sound. I use my car as a stereo whenever I am working in the garage and I have never had a system that was so well balanced from even 100 ft. from the car.

Pros: Amazing high and mid sounds projection, Switch in the crossover to save from rewiring in order to change tweeter volume, easy install

Cons: Just make sure to balance your EQ after install.

Not bad

Anonymous from Pennsylvania on 6/1/2015

2009 Ford F-150 FX4
Crutchfield Customer Review (What's this?)

Definitely an upgrade from factory in my 2009 F150 SuperCrew. Just having tweeters near my ears and not the floor helps. Tweeters are very "bright", almost tinny. But maybe I just need to get used to them.

Pros: Easy drop-in install. Clean look.

Cons: Tweeters sound very "bright". No tweeter attenuation. Switch on crossover is apparently for volume, and is 0, +3 or +6 db.

Great Speakers

r12a13b from Hubert, NC on 5/20/2015

2012 Ford Mustang
Crutchfield Customer Review (What's this?)

The speakers sound great.


Cons: The provided instructions for my application were less than satisfactory. In fact, the instructions were not even for component speakers. In addition, the removal of the door panel could have been much easier with a couple of more or better pictures.


Alan from North Carolina on 5/12/2015

2006 Ford F-250 Super Duty
Crutchfield Customer Review (What's this?)

Excellent speakers and a wonderful upgrade from factory. '06 F250 the tweeters won't flush mount in the A pillar with the way Ford built the dash, so I surface mounted them towards the top over the dash. Sound great!! The 6x8s fit right into the same location.



Great sound

Mandy from Michigan on 5/4/2015

2012 Ford F-150 Platinum
Crutchfield Customer Review (What's this?)

Great sound!




Cfloo from Blue Rapids Kansas on 4/26/2015

2008 Ford F-150
Crutchfield Customer Review (What's this?)

Phenomenal sound and even better performance. Kicker has always been my go to brand but being on a tight budget this time had me worried. Needless to say, my worries are over.

Pros: Budget friendly and quality performance sound. Super easy installation and a terrific fit.

Cons: None to date

Kicker 40CSS684

Anonymous from Broken Arrow, Ok on 4/16/2015

2006 Ford F-150
Crutchfield Customer Review (What's this?)

I'm very happy with these speakers. They sound great, easy install, and great price. Plan on hooking these up to an amp for an even better sound.

Pros: Easy install, great sound, at a great price!

Cons: None


Toolman from Salt Lake, Utah. on 4/5/2015

2010 Ford F-150 XLT
Crutchfield Customer Review (What's this?)

1st off I've owned Kicker products before and was very satisfied. This time the hardest part of the install was figuring how to get door part panel off. Took about 10 minutes and everything was self explainitory. Kicker and Crutchfield, you rock! Thanks.

Pros: Easy and 100% better over factory.

Cons: None

Great speakers

Patrick from California on 3/22/2015

2002 Ford F-350
Crutchfield Customer Review (What's this?)

These are really great speakers. Fit perfectly in my F350. Installed a set in the front and a set in the back. cut a hole for the tweeters in the back about 4" above the regular speakers. The front tweeters I used the adapter and installed them on the tp front of the door panel. The sound is very clear and crisp. You will probably find that you will set your crossovers to 0 depending on where you install your tweeters because there is plenty of highs. Great sound. I can hear instruments in the songs that I did not hear with the stock speakers. If I were to by them again I would probably get baffles just to protect them from the elements. At least the ones that mount in the doors. I will be buying these again for my jeep.

Pros: Great fit. Great sound. Crossovers work great.

Cons: None

Perfect for what I needed

Kevin L from Virginia on 3/13/2015

The speakers are very good but I really appreciate the advice from the Crutchfield consultant. I also had Crutchfield install the speakers. Very professional advice and they walked me through how and where the speakers would be installed in my 2010 F150. The original speakers sounded very muffled. I love my truck and I love music so these Kickers brought both of my worlds together.

Pros: Very radiant sound with crisp highs. Much better than what I had for sure. Good price with the install.

Cons: None so far.


Anonymous from Washington on 3/13/2015

2005 Ford Escape
Crutchfield Customer Review (What's this?)

nice speakers



great purchase!

Lloyd from waldorf md on 3/9/2015

2000 Lincoln LS
Crutchfield Customer Review (What's this?)

Sounds great and very easy to install

Pros: Fit perfectly in my car with no modifications at all.

Cons: None

kicker speakers

Anonymous from st. charles , Ill. on 12/22/2014

2011 Ford F-350
Crutchfield Customer Review (What's this?)

Innstalled 40CSS684. In my 011 F350 and happy with the outcome. Cost and performance what I expected. Sounds much better than the stock speakers. Also running thru my HTC. Harmon kardin iPhone. And stock am/fm CD player.



Upgrade from stock for sure

irepride32 from California on 11/7/2014

2010 Ford F-150 XLT
Crutchfield Customer Review (What's this?)

Definite clarity upgrade from stocks, I was expecting a little more bump out of them but I thing not having an aftermarket amp is why im slightly disappointed. Either way the dirty clipping sound that was coming out of the stocks on my 2010 F-150 XLT is gone.

Pros: Very clean sound, blows the stock speakers outta the water.

Cons: Was hoping for heavier mids but may be due to the crappy stock AMP. I plan on putting an after market AMP in and that may change my mind.


DAN K from SPOKANE, WA. on 10/27/2014

2005 Ford F-150
Crutchfield Customer Review (What's this?)

overall great sound, perfect for running off deck power

Pros: exact fit for vehicle

Cons: need to reinstall once you figure out setting on crossover

Good choice

Popal9800 from Staten island on 10/5/2014

2002 Nissan Quest
Crutchfield Customer Review (What's this?)

Easy install. Nice sound. Recomend for price level upgrade.



Great sound for $$$

jj from Alabama on 9/17/2014

2007 Ford F-150
Crutchfield Customer Review (What's this?)

I always wanted a set of separated speakers like this... but never thought I could afford it, but not now! Lol... I love kickers and was thrilled to get this set... and the did not dissapoint... they fit perfect into my 2007 F150 IN MINUTES... and has lots of extra decorations of you want to install them on out side of speaker hole in door and show them off... they look great, sound great and easy to buy...

Pros: Price for sound is amazing...ease of install... extra parts supporting variation of install

Cons: I did wonder what the switch on cross over should be set at... probably known buy pro, but I ma a weekend warrior so, some reading material to help a little would have been nice... but not needed..

Kicker 40CSS684

MikefromMass from MA on 9/2/2014

2001 Ford Mustang
Crutchfield Customer Review (What's this?)

Powered off Kenwood Excelon head unit. High pass crossed-over at 80hz as part of a 4 speaker+sub/amp system. Sounds great. Had full range sound to it before sub install and they didnt hold up all that well and clipped quite badly. Definitely recommend a HU with built-in crossover capability. May try a small amp for these (front seats) to fix imaging problem (rear-biased soundstage) due to older Mustang speaker position. Plenty of volume otherwise.

Pros: Price, Ford fit, crossover module size is manageable when hiding it during install, plenty of wiring

Cons: Poor low end (clips pretty early)

Kicker 40CSS684

BrentN from McPherson,Ks on 8/25/2014

1997 Mercury Sable GS
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

Kicker 6x8

Jared from Hollister, CA on 8/18/2014

2006 Ford F-150
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


Kicker Speakers

Jonathan from Frostburg, MD 21532 on 8/10/2014

2012 Mazda MX5
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.



KIicker 6x8 Yellow Series

Gavin T. from monroeville, NJ on 8/4/2014

1999 Ford F-250 Super Duty
Crutchfield Customer Review (What's this?)

Great base with clear crisp sound from the tweeters.

Pros: Great sound for a reasonable price

Cons: None

Great speakers

Marisa from Summerville,SC on 7/30/2014

1997 Ford F-250 Light Duty
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



Mike from Lacey, Washington on 6/26/2014

2000 Ford Explorer
Crutchfield Customer Review (What's this?)

Speakers are great for the price.




MikeV from Babylon NY on 6/26/2014

1998 Ford Ranger
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

Kickers F&R

FullThrottleCottle from Sanford Fl on 6/26/2014

1999 Ford F-350
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

Great Product

Robin from Georgia on 6/10/2014

Crutchfield Customer Review (What's this?)

Great product, easy to install. Much needed improvement over factory speakers.

Pros: everything

Cons: nothing

Kicker 40CSS684

Anonymous from Chesapeake, VA on 6/4/2014

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.

NC MX-5 Miata

Scott from Alexandria, VA on 5/30/2014

2012 Mazda MX5
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

Kicker 40CSS684

Charlie from Texas on 3/18/2014

2006 Ford F-150
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


nigknog from great bend ks on 3/15/2014

2008 Ford Explorer
Crutchfield Customer Review (What's this?)

great sound



awesome speakers

brian from toledo oh on 2/22/2014

2012 Ford F-150 XLT
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

Kicker 40CSS684

Anonymous from Chester, MD on 2/19/2014

2002 Ford Mustang
Crutchfield Customer Review (What's this?)

Very good quality

Pros: Goes well with subs


Kicker 40CSS684

Anonymous from Hillsborough, NC on 2/10/2014

2001 Toyota Tacoma
Crutchfield Customer Review (What's this?)

Easy install Fantastic sound



Kicker 40CSS684

Anonymous from Savannah, GA on 1/4/2014

2008 Ford F-150
Crutchfield Customer Review (What's this?)

Just what my Ford F 150 needed. The sound is great and it was a easy installation!



easy installation and great sound

allen from Rockmart Ga on 1/2/2014

2002 Ford F-250 Super Duty
Crutchfield Customer Review (What's this?)

these speakers sound way better in my f250 than i expected. I would recommend these speakers



Good Overall

ac from Bakersfield, Ca on 12/5/2013

2008 Ford F-250 Super Duty
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

so far so good

Anonymous from Goose Creek, SC on 11/10/2013

2004 Ford Mustang
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.

Awesome Product!

Pete K from Tampa Bay, FL on 11/6/2013

1995 Ford Mustang
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!

2013 Mustang GT 4 Speaker setup

OLD DUDE from Odessa TEXAS on 8/26/2013

2013 Ford Mustang
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.

Excellent Speakers

Boo4ya99 from Zephyrhills, FL on 8/8/2013

2007 Ford F-150
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.

Excellent step up from factory

rinos88 from Marquette Heights, Illinois on 7/23/2013

2002 Ford Mustang
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.

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

TravisG from Meridian, MS on 7/16/2013

2004 Ford F-150
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.

Kicker 40CSS684

Chase from Danville Ky on 6/25/2013

2007 Lincoln MKX
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.


Jason G from Denver CO on 6/4/2013

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

"Great Sound"

Mike Y from Hilo, Hawaii on 5/2/2013

2005 Ford F-150
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


Kicker 40CSS684

Art from Riverbank Ca on 3/23/2013

Crutchfield Customer Review (What's this?)

I put these speekers in my wife's vehical, she was very impressed.




Hands-on research

Features and Specs

Speaker Size
Design 2-way
Tweeter Design 3/4" Dome
Impedance (Ohms) 4
Tweeter Composition Titanium
Woofer Composition Polypropylene
Woofer Surround Polyester Foam
Parts Warranty 1 Year
Labor Warranty 1 Year
Sensitivity (1W at 1 meter) 90
Sensitivity at 2.83 volts N/A
Frequency Response 40 - 21k Hz
Minimum RMS Wattage 2
Maximum RMS Wattage 75
Peak Power Handling (Watts) 225
Top-mount Depth (Inches) 2 5/16
Bottom-mount Depth (Inches) 2 11/16
Cutout Diameter or Length (inches) 0

Product Research


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"

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 Yellow Series of amps, speakers and subs gives you the performance you expect from Kicker at a more affordable price. This year's models are better than ever.

What are the Labs?
Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

Kicker has a good name and I wanted a decent component set for my front doors. [ Matthew  Mar 10, 2017 ]
Great component speakers! [ Christopher "CR  Dec 13, 2016 ]
christmas present [ richard  Dec 02, 2016 ]
Upgrade pioneer speakers [ JAVIER  Sep 25, 2016 ]
recomended by Crutchfield advisor [ Steven  Sep 05, 2016 ]
Andy, from Crutchfield, suggested these speakers. I've also heard good things on car forums about these speakers. Andy's Bio: [ VTengineer  Aug 17, 2016 ]
Kicker drivers sound great. [ B  Jun 28, 2016 ]
wanted to try some components :) [ Brandon  May 18, 2016 ]
Kicker makes great products. [ Anthony  Apr 26, 2016 ]
should work with my setup. reviews seemed good and cant beat the price or reliability of kicker products. [ cody  Apr 13, 2016 ]
Replacement speakers for my work truck [ Charles  Mar 11, 2016 ]
To replace the factory speakers. [ Jason  Feb 17, 2016 ]
Because it was a 6x8, and that is what I am replacing [ Robert  Feb 06, 2016 ]
small upgrade to my mustangs sound system...nothing fancy [ Francis  Feb 03, 2016 ]
These have a really good rating and fit perfectly to my car [ Jonathan P.  Dec 11, 2015 ]

5 questions already asked

Yes, they are rated to 75 Watts RMS. You'll be fine. [ GREG  Aug 09, 2016 ]
Yeah they'll run and sound clean but you'd be better off running them off an amplifier. [ Ryan  Aug 07, 2016 ]
Yes. I'm using them in my 2006 Ford F-150 with a Kenwood KDC-HD545U that provides 22 RMS X 4. They have good clarity and provide good mids and highs. Prior to buying them I read that they don't provide a lot of bass, so I added a powered sub. I'm happy with the sound. I have noticed some distortion above receiver volumes of 90%, but I don't believe this to be due to the speaker since the speakers can handle 75 RMS and my receiver provides up to 50 RMS. I found that the lowest of the three crossover tweeter settings provided plenty of highs. I doubt you would have to increase the setting. Hope this helps! [ Mike  Aug 05, 2016 ]
Bad crossover. When I bought mine. The crossovers where bad. Sent them back to Crutchfield and they replaced them quickly. New speakers worked just fine. [ TERESA  Dec 27, 2015 ]
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the connections on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: Or try our online support center: [ Kenny  Dec 26, 2015 ]  Staff
I put two pairs of these speakers in my 2013 F250 (front door and rear pillars as it is a crew cab). Sound great. I think two sets are better to balance the sound. [ WARREN  Dec 29, 2014 ]
Yes. Most definitely. These speakers have an awesome sound. [ BRUCE  Dec 29, 2014 ]
One in the front should be enough, just put some good speakers in the back but they aren't wor the extra money to use in the rear also, they are amazing in the front though [ DANIEL  Dec 29, 2014 ]
I put 2 sets in my truck and in my wife's SUV. I don't like for all the sound to be in the front. I hate if I'm in the back seat of a car and it sounds like the words are coming from the front. I think having them in the front and rear makes for equal sound and in my truck I have a 12 in sub, so it keeps the words and the mid notes from being covered up by bass. Hope that helps. [ THOMAS C  Dec 29, 2014 ]
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  Aug 25, 2014 ]  Staff
I agree with Mark, surface mount them. [ BRUCE  Dec 29, 2014 ]
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  Apr 21, 2014 ]  Staff