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Infinity KAPPA 90CSX and KAPPA 20MX

810W Max (270W RMS) 6" x 9" Kappa Series 2-Way Component Car Speakers with 2" Midrange Drivers

Infinity
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• 405W Max Each, 135W RMS Each
• Includes the Kappa 20MX Midrange Drivers for a Complete 3-Way System
•1.4" Edge Driven Soft Dome Tweeters
• Glass Fiber Cones
• 2.5 ohm Impedance
• Sensitivity: 94dB
• Mounting Depth: 3.14"

Learn more about the kappa90csx_kappa20mx

We apologize

This item has been discontinued


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Description


Infinity brand icon

Authorized dealer

Infinity's Kappa series component speakers have taken it up a notch this time around, giving audiophiles the flexibility to turn their 2-way component systems into 3-way packages. We've made it easy for you to make that choice with this product combo! Add this to your cart and you've got everything you need to get the complete Kappa experience.

With these 6" x 9" components and the 2" midrange drivers, you'll hear more than you thought was possible. This is one of those cases where more is, in fact better. Buy it now and your ears will thank you later!

Infinity KAPPA 90CSX

810W Max (270W RMS) 6" x 9" Kappa Series 2-Way (3-Way Upgradeable) Component Car Speakers
Quantity: 1

Product Details:

  • 6" x 9" Kappa Series 2-Way Component System
  • 3-way upgradeable: Add the Infinity KAPPA-20MX to completely round out your sound
  • Power Handling:
    • Peak: 810W per set / 405 each side
    • RMS: 270W per set / 135W each side
  • Glass fiber Plus One woofer cone
  • Rubber surround
  • Low impedance design gets more out of your stereo or amplifier
  • 1.4" Edge-driven soft-dome tweeters
  • Gap switchable crossovers
  • 3-Way upgradeable
  • 1.3" Oversized voice coil
  • Top-mount Depth: 3.14"
  • Cutout Dimensions: 8.6" x 5.75"
  • 2.5 ohm impedance
  • Frequency Response: 35 - 35000 Hz
  • Sensitivity: 94dB
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty
  • Priced Per Complete Component System: 2 midwoofers, 2 tweeters and 2 crossover networks.

Check out the 90CSX Owner's Manual


PROP 65 WARNING: This product can expose you to chemicals including lead and lead compounds, which are known to the State of California to cause cancer or birth defects or other reproductive harm. Wash hands after handling. For more information, visit www.P65Warnings.ca.gov

Infinity Kappa 20mx (KAPPA-20MX)

390W Peak (130W RMS) 2" Kappa Series Midrange 2.5-ohm Car Speakers
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Product Details:

  • 2" Kappa Series Mid-range Car Speakers
  • Power Handling:
    • Peak: 390 watts per pair / 195 watts each
    • RMS: 130 watts per pair / 65 watts each
  • Glass Fiber cone material
  • Rubber speaker surround
  • Bandpass crossover enclosure
  • Patented Plus One woofer speaker construction
  • Voiced using audiophile grade inductors and capacitors
  • SLI (Super Low Impedance) high output design
  • Passed Harman standard reliability testing
  • Top-mount Depth: 1-1/8"
  • Cutout Dimensions: 2-5/8"
  • Impedance: 2.5 ohm
  • Frequency Response: 550 - 7000 Hz
  • Sensitivity: 90 dB
  • Authorized Internet Dealer
  • MFR #: Kappa 20mx
  • 3 Year Manufacturer's Warranty

  • Priced Per Pair


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Specifications & Details


Speaker Specifications
Series
Kappa Series
Priced Per
Pair
Number of Speakers
2 Speakers + 2 Tweeters
Speaker Size
6" x 9"
Design
3-way Coaxial
Tweeter Design
Dome
Tweeter Size
1-3/16"
Woofer Composition
Glass Fiber
Woofer Surround
Rubber
Peak Power Handling
405 watts
RMS Power Handling
135 watts
Sensitivity
94 dB
Frequency Response
35 - 35000 Hz
Impedance (Per Voice Coil)
2.5
Top-Mount Depth (Mounting Depth)
3.14"
Cutout Dimensions
5.75 x 8.6 
General specifications
Speaker Grilles
Yes
What is in the box?
Paperwork
User manual
Warranty/Registration card
WITB: Speakers
Speakers (2)
Grilles (2, detached)
Speaker mounting brackets (2)
Tweeters (2)
Tweeter angle mounts (2)
Tweeter flush mounts (2)
Tweeter surface mounts (2)
Crossover networks (2)
Speaker connection cables (2)
Other Accessory #1
2 2" Midrange Drivers
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Item Details


Manufacturer:

Model Number:

KAPPA 90CSX and KAPPA 20MX

Weight:

10.00lbs

Internal SKU:

kappa90csx_kappa20mx

Internal Product ID:

143897

Customer Ratings & Reviews


Infinity KAPPA 90CSX and KAPPA 20MX thumbnail image

5 star
100%
4 star
0%
3 star
0%
2 star
0%
1 star
0%



Durability
5
Value
5
Features
4.7
Design
5
Usability
4.7

Customer Photos & Videos


Customer Reviews

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Great midrange speakers

The following review is for Kappa 20mx, which is a part of the bundle you are viewing.

I'm a big fan of infinity kappa speakers and these do not disappoint. Price is good and build quality is excellent. I have these powered off my receiver and they are louder than I expected. Bright and very musical but I ended up turning them down a bit. These are meant to be added to a infinity 2 way component set because they have a plug that plugs into the crossover. You just need to cut one end off and you can use them as is. I installed them in a 2016 jeep compass and it was very easy. They fit perfectly in the middle air vents. No cutting, sanding, or grinding at all. Fit perfectly in with the grills. I even just used the hardware that was included. Kappa 6x9 front doors with reference series 6x9 rear doors. Sounds better than any premium factory system I've heard. Check out the pictures, infinity badge came from 6x9s

By Doug on October 17, 2025 Checkmark Icon Verified purchase
2016 Jeep Compass

3 found this helpful


Best sound for the money

Requires adapters or adapter fabrication to fit my car. Obviously, most speakers/vehicles do. Door rattle required some sound deadening.

Sound is excellent. Still playing with EQ settings and breaking the speakers in.

I will update again the future once I have 100hrs of music playing time on them.

With SonicElectronix pricing, this purchase was a steal and superbly improved front 3-way front sound stage.

By Anonymous on September 2, 2018 Checkmark Icon Verified purchase

2 found this helpful


The following review is for Kappa 20mx, which is a part of the bundle you are viewing.
By Victor on February 11, 2026 Checkmark Icon Verified purchase
2016 Toyota RAV4




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Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:

  • You see only parts engineered for your exact vehicle
  • You avoid incompatible radios, speakers, or wiring
  • Installation is smoother, faster, and frustration-free
  • You get the correct accessories the first time

Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.