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Infinity Kappa 90csx

Kappa Series 6"x9" component speaker system

Item # 108K90CSXM

Infinity's reputation is legendary, but their Kappa Series car speakers don't rest on those laurels.

Find what Fits your car

Infinity's reputation is legendary, but their Kappa Series car speakers don't rest on those laurels.

California customers:
Please click here for your Proposition 65 warning.

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Item # 108K90CSXM

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About the Infinity Kappa 90csx

The legend continues...

Infinity's reputation is legendary, but their Kappa Series car speakers don't rest on those laurels. Designed and built for audiophile tastes, this Kappa 90csx 6"x9" component speaker system benefits from a refined design, Infinity's proprietary technology, and premium materials to deliver uncompromised audio quality.

The legend continues...

Infinity's reputation is legendary, but their Kappa Series car speakers don't rest on those laurels. Designed and built for audiophile tastes, this Kappa 90csx 6"x9" component speaker system benefits from a refined design, Infinity's proprietary technology, and premium materials to deliver uncompromised audio quality.

Edge-driven dome tweeters

Infinity employs an edge-driven design in their soft dome tweeters for a smoother, more open response and minimal distortion at high volume. Prepare for a more clearly defined soundstage and marvel as your music seems to come alive across your dash.

Woofers enhanced with Plus One+ technology

Bring on the bass. Kappa's glass fiber woofer will hold its shape when the power's cranked up, so you still get punchy and defined bass. Glass fiber weighs less than traditional materials, so you don't need a ton of power to drive this woofer either. Infinity's Plus One+ woofer technology extends the cone right up to the edge of the basket, giving you lots of surface area — and a bigger cone means more bass to complement the superior high-frequency response.

Premium crossovers

Infinity holds their external crossovers to the same standards as the rest of this speaker system. Premium components shape the distinctive Kappa sound and bring out all the details that make your music sound real.

These crossovers will easily accommodate an upgrade to a 3-way system if you'd like to add Infinity's optional Kappa 20mx 2" midrange drivers.

Awesome power handling, no matter the system

These 2.5-ohm speakers boast ultra-high sensitivity so that you can power them with a factory radio or aftermarket stereo, but we recommend feeding them plenty of power from an outboard amp — up to 135 watts RMS. Either way, these speakers' low impedance safely takes advantage of every watt of power available for exceptional performance. Enjoy Kappa sound quality at any volume. Grilles are included.

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Product highlights:

  • component speaker system includes 2 woofers, 2 tweeters, and 2 external crossovers
  • 6"x9" Plus One+ glass-fiber woofer cone with hi-roll rubber surround
  • edge-driven, soft dome tweeter
  • 2.5-ohm impedance
  • handles up to 135 watts RMS (405 watts peak power)
  • frequency response: 35-35,000 Hz
  • sensitivity: 94 dB at 2.83 volts
  • woofer top-mount depth: 3-3/16"
  • grilles included
  • warranty: 3 years
  • Our 60-day money-back guarantee
  • MFR # KAPPA-90CSXAM

What's in the box:

  • 2 Woofers
  • 2 Tweeters (each has attached 6" speaker leads with male quick-slides)
  • 2 Woofer grilles
  • 2 Grille frames
  • 2 Woofer bottom mount brackets
  • 2 Crossovers
  • 2 Flush-mount cups
  • 2 Threaded flush-mount adapters
  • 2 Plastic locking nuts
  • 2 Surface-mount cups
  • 2 Starfish tweeter mounts
  • Eight 1-1/2" Allen head screws
  • 3mm Allen head bit
  • Eight 1-3/8" Screws
  • Six 1/2" Flat head screws
  • Two M4x10mm Machine screws
  • 2 Washers
  • 16 Speed clips
  • 2 Adhesive backed Infinity logo badges
  • 2 Adhesive backed foam gaskets
  • Template on box
  • Installation manual

Scratch & Dent items may be missing non-essential accessories. In some cases the manufacturer's accessories have been replaced with generic equivalents.

See the difference between "Open Box" and "Scratch & Dent" Outlet items

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More details on the Infinity Kappa 90csx

Pat M.

Features & specs

General
Speaker Size 6X9
Design 2-way
Tweeter Design Edge-Driven Dome
Impedance (Ohms) 2.5
Tweeter Composition Textile
Woofer Composition Glass Fiber
Woofer Surround Rubber
Parts Warranty 3 Years
Labor Warranty 3 Years
Specifications
Sensitivity (1W at 1 meter) N/A
Sensitivity at 2.83 volts 94
Frequency Response 35 - 35k Hz
Minimum RMS Wattage ---
Maximum RMS Wattage 135
Peak Power Handling (Watts) 405
Top-mount Depth (Inches) 3 3/16
Bottom-mount Depth (Inches) 3 7/8
Cutout Diameter or Length (inches) 0
Mounting Height (Inches) 0.402
The Infinity Kappa 90csx replaces these items:

Product Research

Features

Plus One Woofer Cones: The Plus One woofer cones offer more surface area than other speakers that fit in the same size opening. This is accomplished by using a new basket design and hi-roll surround. The result is greater bass output and an increase in efficiency.

High-Output Design: The high output 2.5Ω voice coil design compensates for the high in-line resistance of small gauge factory wiring and extracts every watt from factory receivers, increasing overall system output and efficiency (relative to 4Ω speakers). The speakers also benefit from increased power when you upgrade the wire and add aftermarket amplifiers, designed to power a 2.5Ω load.

Woofer Terminals: The woofers' input terminals are set screws that will accept up to 12 gauge bare wire.

Edge Driven Tweeters: The edge-driven tweeters use textile soft domes. An edge-driven tweeter has better dispersion characteristics and allows for a lower crossover frequency than typical tweeters of the same size, which improves imaging, vocals and musical clarity.

Tweeter Mounting: The I-Mount tweeter mounting system and Starfish mounting brackets give you several different ways to mount the tweeters:

  • I-Mount Tweeter Mounting System: The tweeters can be surface or flush mounted with Infinity's innovative I-Mount system:
    • Surface Mount: Surface mounting the tweeters involves screwing the surface-mount cup to the mounting location, then inserting and locking the tweeter into the cup.
    • Flush Mount: Flush mounting is made easy through the use of the threaded flush-mount adapter and plastic locking nut. Once a cutout is made, the flush-mount adapter (with the tweeter installed) is inserted into the hole. The large plastic locking nut is threaded onto the adapter (from behind the mounting surface) to hold the complete assembly securely in place. When flush mounted, the tweeters may be angled for optimum response and imaging.
  • Starfish Mounting Brackets: The Starfish mounting brackets allow the tweeters to be installed in factory locations behind the grilles:
    • Surface Mount (behind grille panel): Once the Starfish bracket is trimmed, it is screwed to the mounting surface behind the grille panel. Then, the tweeter is inserted into the bracket and locked into place.
    • Flush Mount (behind grille panel): Once the Starfish bracket is trimmed, it is dropped into the cutout in the mounting surface behind the grille panel. Then, the tweeter is inserted into the bracket and locked into place.
    • Bottom Mount (to grille panel): Once the Starfish bracket is trimmed, it is secured to the underside of the grille panel. The tweeter must be inserted into the bracket and locked into place before the bracket is mounted.

Tweeter Mounting Dimensions:

  I-Mount Surface Mount I-Mount Flush Mount Starfish Surface Mount (behind grille panel) Starfish Flush Mount (behind grille panel) Starfish Bottom Mount (to grille panel)
Mounting Height 0.860" 0.594" 0.861" 0.337" 0.0"
Depth 0.372" (screw depth) 0.750" 0.331" (screw depth) 0.601" 1.150"
Frame Diameter 1.618" 2.218" 1.661" 2.463" 3.260"
Cutout Diameter N/A 1.897" N/A 1.661" N/A

Crossovers: Each crossover has a tweeter output level switch; choose between flat and +3dB. They have screw terminal inputs and outputs that will accept gauge bare wire or spade connectors up to 0.315" wide.

Crossover Dimensions:

  • Diameter: 4-3/8"
  • Height: 1-3/8"

3-Way Upgrade: The system crossovers are gap-selectable, to accommodate a midrange upgrade. The optional 20mx midrange (item number 108K20MXM, sold separately) includes band pass crossover to upgrade this two-way system to a three-way system with perfect tonal balance.

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Customer Q&A

6 questions already asked

Q
can I connect the woofer only? Wire it directly or use the crossover without connecting the tweeter?
[ Edward  Nov 19, 2020 ]
2 answers
A
Use the crossover
[ CYNTHIA  Nov 19, 2020 ]
A
You can do either one. I am running the 3 way crossover with the extra mids.
[ MARK  Nov 19, 2020 ]
Q
will these fit in a 1988 BMW 735i?
[ AbleTwo  Jul 14, 2020 ]
1 answer
A
Sorry but no. The 1988 BMW 735i has 5 1/4 inch speakers front and rear accompanied by 1.5 inch tweeters. I put 90csx set in my 2016 Honda civic but it was a fully custom modified job. Simplest way would be to purchase a nice component set with the 5 1/4 inch speakers.
[ Jeffrey Lynn  Jul 15, 2020 ]
Q
What's the exact dimensions of just the tweeter because I want to get tweeter pods for them?
[ Daniel  Jun 15, 2020 ]
1 answer
A
The dimensions of the tweeter without any mounting gear are 1.413" diameter and 0.716" tall
[ Paul  Jun 30, 2020 ]  Staff
Q
Have a 2016 honda pilot was looking for some have a great speakers from the factory would the speakers be a good fit in the 2016 honda pilot?
[ Junior  Jun 10, 2020 ]
1 answer
A
Was yours the EX, LX or Touring edition? We don't show that any of those versions had 6x9" factory speakers. You would have to make modifications to install those. You might be better off going with a 6 1/2" speaker. You can connect with one of our friendly product advisors to see which speakers are the best fit for your Honda here: https://www.crutchfield.com/I-rET1c290/S-SUliZgSTXG7/support/ContactUs.aspx
[ Cosmo  Jun 24, 2020 ]  Staff
Q
How do you open the crossovers? White dots in the middle turned left or right, won't open.
[ Gabriel  May 20, 2020 ]
3 answers
A
You don't open up the go button you takeoff the black cover
[ MELVIN  May 20, 2020 ]
A
I remember having an issue getting the covers off my crossovers as well. If I recall correctly, it was a "twist & pull". I may have implemented a flat screwdriver in the first one to help pry it off. Then I saw how it worked, and the second cover was a piece of cake.
[ JOHN  May 20, 2020 ]
A
Turn counter clockwise to open.
[ MARK  May 20, 2020 ]
Q
Can you please tell me the mounting depth of the flush-mount adapter for the tweeter? I didn't see this dimension in the owner's manual. Thank you.
[ Ron  Sep 24, 2019 ]
2 answers
A
The mounting depth needed with using the I-mount flush mount adapter is 0.75"
[ Paul  Oct 09, 2019 ]  Staff
A
Well... I fortunately have not installed them yet.. I pulled the tweets and the static mounts are surface mount, the swivel mount requires a hole but depending on the thickness of the panel is a Max of 0.4 inches. Should not be an issue in 95%+ of vehicles...
[ Richard  Oct 08, 2019 ]
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