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Focal K2 Power 100KRS

4" component speaker system

11 Reviews | 1 question - 1 answer

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Focal ES 100K

2 Reviews



Our take on the Focal K2 Power 100KRS

The K2 Power 100KRS 4" component speaker system bears the hallmarks of Focal's "Power Hi-Fi" philosophy. The nimble Aramid and glass-fiber woofers demonstrate the control needed to reproduce delicate classical passages, yet they'll handle the power needed to drive your bass-heavy music with authority. The sturdy zinc-aluminum alloy baskets are non-magnetic so they won't interfere with the speaker's own electronics.

K2 Power speakers — engineered for superb sound

Side view of K2 Power speaker

At Focal, all that matters is music. Focal's sound gurus engage in intensive listening sessions as they design a new line of speakers, making it their mission to create products that deliver uncanny realism, sweeping dynamics, and breathtaking depth. During the hands-on production process, they test every model meticulously to ensure that they meet Focal's exacting standards.

Focal's "Power Hi-Fi" philosophy

The K2 Power 100KRS 4" component speaker system bears the hallmarks of Focal's "Power Hi-Fi" philosophy. The nimble Aramid and glass-fiber woofers demonstrate the control needed to reproduce delicate classical passages, yet they'll handle the power needed to drive your bass-heavy music with authority. The sturdy zinc-aluminum alloy baskets are non-magnetic so they won't interfere with the speaker's own electronics.

Inverted dome tweeter design

Inverted dome tweeter design

Focal's inverted dome tweeters act like little woofers, dispersing the highs in a wide pattern to create an exceptionally natural soundstage. K2 Power crossovers use hand-made components developed by Focal to deliver an ideal blend of the highs and lows for a dynamic stereo image. Three levels of tweeter and two levels of midrange control let you dial in the sound to your car's environment.

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 two 4" woofers, 2 tweeters, 2 external crossovers, and 2 woofer grilles
  • K2 composite woofer cone (Aramid, foam, and glass fiber)
  • butyl rubber surround
  • 1-3/4" woven Aramid fiber inverted-dome tweeter
  • 2-way external crossover with 3 tweeter and 2 midrange level settings
  • 4-ohm impedance
  • power range: 6-50 watts RMS (100 watts peak power)
  • frequency response: 120-20,000 Hz
  • sensitivity: 90 dB @ 2.83 V
  • mounting depth: 1-9/16"
  • warranty: 1 year
  • Our 60-day money-back guarantee

Great mids and highs. When paired with a sub, these sound fantastic!

Jeremy, Austin, TX

What's in the Box:

  • Two 4" Woofers
  • Two inverted dome tweeters (with attached 23" length of speaker wire)
  • 2 Tweeter flush mount cups (installed)
  • 2 Tweeter angle mount cups
  • Tweeter removal tool
  • 2 Crossover networks
  • 2 Woofer grilles
  • 2 Woofer grille mounting rings
  • 2 Tweeter flush mount clamps
  • 2 Woofer mounting gaskets
  • 8 Speed clips
  • 2 Machine screws (for flush mounting)
  • Four 5/8" Self-tapping screws
  • Sixteen 1" Self-tapping screws
  • Owner's manual (English/ French)
  • Focal window sticker
  • Serial number card

Featured Video:


Focal K2 Power 100KRS Reviews

Average Customer Review(s):

(11 Reviews)

Great mids and highs

Jeremy from Austin, TX on 7/24/2017

1977 Mercedes-Benz 450SL
Crutchfield Customer Review (What's this?)

Great mids and highs. When paired with a sub, these sound fantastic!



Best sound

Anonymous from Calexico, CA on 7/13/2017

2007 BMW Z4
Crutchfield Customer Review (What's this?)

Best speaker replacement for my ZHP.



Focal K2 Power 100KRS

Robert from San Antonio, TX on 12/25/2016

2007 BMW X3
Crutchfield Customer Review (What's this?)

These speakers are the definition of hi quality.

Pros: Perfect.

Cons: None

Focal K2 Power 100KRS

Anonymous from Fremont, NE on 12/6/2016

2011 BMW 3 Series
Crutchfield Customer Review (What's this?)

small speaker, big sound. Very impressive



Focal K2 Power 100KRS

Anonymous from savannah georgia on 11/21/2016

2001 Chevrolet Silverado 2500/3500
Crutchfield Customer Review (What's this?)

Easy install



Fits perfect

DJ from Irvine, CA on 6/27/2016

2016 Mercedes-Benz GLC-Class
Crutchfield Customer Review (What's this?)

Great value for the money on sale price. One of the very few options out there for quality 4" components. Very nice improvement over the stock speakers.



Focal K2 Power 100KRS

Jose from Shorewood, IL on 5/7/2016

2016 Polaris RZR S 900
Crutchfield Customer Review (What's this?)

These are small speakers so bass is none existent. Vocals are clear and accurate.

Pros: Small and detailed sound

Cons: None

great speakers, but i wish the crossover could be smaller

eugene L from Monterey, CA on 5/1/2016

2015 Porsche 911
Crutchfield Customer Review (What's this?)

Focal speakers are generally great. I bought these to replace my stock Bose speakers. The sound quality is much more crisp and clean. I do wish there is an option to have bass blockers or small crossovers as an option. The ones that came with the speakers are too big for my car.

Pros: Great sound quality

Cons: Crossover may not be suitable for stock stereo systems.

Searching for the sound!

Matt M from denver, co on 4/29/2015

1986 Volkswagen Vanagon
Crutchfield Customer Review (What's this?)

Wow! These speakers are incredible. I am an audio nerd but have always been unable to invest in worthy equipment. The sound is life like and pack quite a punch for the size! Definitely want to add a pair of 6x9's in the future. Highly recommend for anyone that wants a concert experience in their vehicle!

Pros: output, size, sound quality

Cons: price tag(well worth the investment though)

Focal K2

Anonymous from Dallas Tx on 5/27/2014

Crutchfield Customer Review (What's this?)

I have had focal in all my cars. Now I have an AUDI A4 2009. My friends make and adaptor for my alpine stereo and looks great. And the speakers focal sound like angels. I love it.

Pros: The sound quality is incredible.

Cons: The price is a little high

Tiny but mighty

ChadP from Ladoga,IN on 9/29/2013

2007 BMW X3
Crutchfield Customer Review (What's this?)

I got these to replace some JL 3.5" speakers my installer had used about a year ago. At the time I was aware of these but didn't want to spend alot of money. With a price drop I decided to give them a try because they are the only nice 4" speakers that will fit a BMW X3 and handle the power of an after market amp. All I can say is WOW, what a difference they made. I'm going for a stealth stock look so the factory head unit goes to a Clarion cleansweep oem interface coupled to a JL 5 ch XD 100x4 & 300X1 that runs an Alpine 10" marine sub that used the space of one of the storage cubbies in back in a custom enclosure so that it looks just like it came with the car and takes up no extra space in the cargo area. The amp and interface fit just right in the battery area under the rear cargo hold. Somewhere behind the side panel is a dice interface so that the stock radio controls SiriusXM. This setup is very loud but clean. there is no clipping, rattling(thanks Dynamat), or other distractions. I went for a more refined audiophile sound and these speakers are great for that while still being able to rock out and feel your insides melt. If you have limited mounting depth as I did these are probably the best speakers in a 4" size.

Pros: Great fidelity Decent power handling Compact Very attractive

Cons: While worth it they are very expencive


Hands-on research

Features and Specs

Speaker Size 4
Design 2-way
Tweeter Design Inverted Dome
Impedance (Ohms) 4
Tweeter Composition Kevlar
Woofer Composition K2 Composite
Woofer Surround Butyl Rubber
Parts Warranty 1 Year
Labor Warranty 1 Year
Sensitivity (1W at 1 meter) N/A
Sensitivity at 2.83 volts 90
Frequency Response 120 - 20k Hz
Minimum RMS Wattage 6
Maximum RMS Wattage 50
Peak Power Handling (Watts) 100
Top-mount Depth (Inches) 1 5/8
Bottom-mount Depth (Inches) 1 13/16
Cutout Diameter or Length (inches) 3 11/16

Product Research



K2 Cone: The woofer cone is a sandwich composite consisting of a foam core, a structural glass fiber bottom layer, and a Kevlar top layer. This combination of materials results in a rigid, light weight cone with excellent damping characteristics.

Surround: The butyl rubber surround is resistant to ultraviolet rays, temperature extremes, and humidity to add to the speaker's reliability and longevity.

Phase Plug: The bullet-shaped aluminum phase plug in the center of the woofer ensures a smooth, flat off-axis frequency response by preventing the high frequency sound waves emanating from one side of the cone from interfering with sound waves from the other side of the cone.

Zamak Basket: The woofer features a cast Zamak basket. Zamak is a rigid alloy of Zinc, Aluminum, Magnesium, and Copper. Zamak is non-magnetic.

Voice Coil: The voice coil is wound around a 1" diameter low-mass Kapton former, ensuring no coil deformation.

Neodymium Magnets: The speaker uses a Neodymium magnet, which has the same magnetic flux power as a ceramic magnet 10 times its size, reducing the size and weight of the speaker.


Inverted Dome Tweeter: The tweeter is an inverted Kevlar dome, producing a broad sound stage. The tweeter has a Neodymium magnet to provide a powerful magnetic field for the voice coil, while still maintaining the tweeter's compact dimensions.

Mounting Options: The tweeter can be surface or flush mounted using the included adapters. Focal recommends flush mounting, but the included angled cup allows surface mounting at one of two angles; approximately 15° and approximately 40°.


Components: Focal uses audiophile grade polypropylene capacitors and air core inductors to ensure high definition and a dynamic sound quality.

Tweeter Level: You can adjust the output level of the tweeter on the crossover to -6 dB, -3 dB, or 0 dB.

Midrange Level: Set the midrange output to High or Flat to match their position in the car. When the mids are installed low in the door, some of the output is absorbed by the upholstery and they benefit from the High output setting.

Crossover Slopes: The crossover uses 2nd order, 12 dB per octave low-pass and high-pass filters. The crossover frequency for both is 3,500 Hz.

Wiring: The inputs and outputs are screw terminals; they will accept bare wire or spade connectors up to 0.315" wide.



  Flush Mount Angled Surface Mount
Mounting Height 0.295" 1.236"
Depth 0.96" 0.542" (screw depth)
Frame Diameter 2.055" 1.840"
Cutout Diameter 1.828" N/A

Crossover: The crossover dimensions are:

  • Width: 4.915"
  • Height: 1.335"
  • Depth: 3.736"

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

What are the Labs?
Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

Good reviews, perfect size for my application including the shallow installation depth. [ Randy  Jul 21, 2017 ]
Size, Focal quality / reputation [ R  Jun 21, 2017 ]
Mounting depth [ Michael  Jun 07, 2017 ]
They say you get what you pay for. We shall see! I can't wait to get these installed in my Porsche 911. [ William  Jun 01, 2017 ]
need speakers for my truck [ P  May 23, 2017 ]
Good fit for bmw e90 front doors [ Adrian Lobaina  Apr 07, 2017 ]
The Quality is high and the price is right. [ ARMANDO  Mar 03, 2017 ]
Consistently very positive reviews on these high quality Focal speakers. Fits my Porsche Boxster S Dash with slight modification for tweeter installation. Have wanted Focals for a while and finally decided to replace the aftermarket speakers currently installed. [ Mitchell  Jan 22, 2017 ]
No one can come close to matching this price for these very high quality speakers [ James  Nov 27, 2016 ]
I have a 2013 BMW 328i and the Focal speakers are absolutely the best that I have heard. I wanted replacement speakers and a subwoofer that would not change the interior design of the car. I play the violin and love clear clean music and Focal delivers. [ Nancy Bell  Nov 07, 2016 ]
good deal [ bob  Oct 31, 2016 ]
Because Focal are the best speakers. [ John  Oct 30, 2016 ]
I was hoping it would fit BMW M235i - unfortunately they will not fit without modification. More modification than I was willing to do on a brand new car. [ J  Apr 26, 2016 ]
K2 speaker sound great. This is my 2nd pair. Natural & good sound stage! You paid for what you get! Been buying focal speakers for over 5 years and love them! [ milton  Mar 06, 2016 ]

1 question already asked

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  Dec 17, 2014 ]  Staff