Infinity Kappa 100.9W

350W 10" Kappa Series Selectable Smart Impedance Subwoofer

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Product videos

• 1400W Peak
• 350W RMS
• Coated Glass-Fiber Woofer Cone
• Thick Rubber Surround
• Selectable Smart Impedance (SSI)
• 2" Voice Coil Diameter
• Cast Aluminum Basket

Learn more about the 1009w

Good news and a little bad...

This item has been discontinued

But you may be interested in the newest model that's available.

kappa1000wblkam thumbnail

Infinity KAPPA 1000WBLKAM

OUR PRICE: $219.95

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Product Highlights

• 1400W Peak
• 350W RMS
• Coated Glass-Fiber Woofer Cone
• Thick Rubber Surround
• Selectable Smart Impedance (SSI)
• 2" Voice Coil Diameter
• Cast Aluminum Basket



Authorized dealer

Infinity subwoofers have always distinguished themselves clearly from the competition. The Infinity SSI Kappa series subwoofers are no exception and fight on a playing field all their own. Right away the coated glass-fiber cone shows off an air of sophistication and style while offering incredible rigidity that minimizes distortion.

Once you get past the cultured exterior, the interior components uphold Infinities affinity for advanced technology. This Kappa sub utilizes a triple voice coil system which gives it the incredible ability to offer selectable impedance. Selectable Smart Impedance (SSI) technology allows this sub to run at 2 Ohms or 4 Ohms with the flick of a switch. This allows you to extract the most from your subwoofer amplifier in any situation. If you decide to add a subwoofer down the line, SSI makes it easy to reconfigure your entire system without buying different subwoofers or amplifiers.

The SSI Kappa subwoofers handle a remarkable amount of power and sound incredible in sealed or ported enclosures. If you want great sounding bass with unheard of wiring versatility, Infinity Kappa subs are technologically advanced enough to handle it.

The Sound of quality

Sonic Electronix, one of the leaders in car audio, recently visited Harman, the premium global audio and infotainment group, at their research and development locations in Northridge, California and Detroit, Michigan. The purpose of these visits was to utilize and combine the powerful brand of Harman and the industry leading knowledge behind Sonic Electronix to begin working together on developing future car audio projects.

General Features:

  • 10" SSI Kappa Series 2 Ohm or 4 Ohm Subwoofer
  • Power Handling:
    • Peak: 1400 watts
    • RMS: 350 watts
  • Impedance: Selectable 2 or 4 ohms
  • Coated glass-fiber woofer cone
  • Thick rubber surround
  • Selectable Smart Impedance (SSI) lets you set the subwoofers impedance with the flip of a switch
  • Cast aluminum basket with voice coil vents
  • Triple voice coil technology
  • 2" Voice coil diameter
  • Rubber boot surrounds the magnet structure
  • Frequency response: 25-400 Hz
  • Sensitivity: 89 dB
  • Authorized Internet Dealer
  • 3 Year Manufacturer's Warranty

Package Includres:

  • 100.9w SSI Subwoofer
  • Foam Mounting Gasket
  • 3mm Hex Wrench
  • Owner's Manual
  • Technical Data Sheet

Learn more about the 100.9W at our blog.

Product history:

Infinity KAPPA 1000WBLKAM thumbnail
(newest, current model)
Infinity Kappa 1000W thumbnail
(previous model, replaced by Infinity KAPPA 1000WBLKAM)
Infinity 100.9W thumbnail
(previous model, replaced by Infinity Kappa 1000W)
Infinity 102.7w thumbnail
(previous model, replaced by Infinity Kappa 100.9W)

Subwoofer Wiring Guide

Wiring Guide to Wire 1 Infinity Kappa 100.9W Subwoofer

Mono Amp

Wiring Guide to Wire 2 Infinity Kappa 100.9W Subwoofers

Mono Amp

Mono Amp - Option 1

2 Channel Amp

2 Channel Amp - Bridged

Wiring Guide to Wire 3 Infinity Kappa 100.9W Subwoofers

4 Channel Amp

Wiring Guide to Wire 4 Infinity Kappa 100.9W Subwoofers

Mono Amp

2 Channel Amp

4 Channel Amp

Specifications & Details

Subwoofer Specifications
Kappa Series
Subwoofer Size
Peak Power Handling
1400 watts
RMS Power Handling
350 watts
Voice Coil(s)
Impedance (Per Voice Coil)
2 or 4 ohms
Frequency Response
25 - 400 Hz
89 dB
Xmax (millimeters)
17.55 mm
Subwoofer Design
Round / Circle
Main Cone Color
Woofer Composition
Coated Glass Fiber
Woofer Surround
Subwoofer Grille
Re-Cone Kit Available
Recommended Enclosure Specifications
Recommended Enclosure Type
Ported / Vented
Minimum Sealed Box Volume
0.75 cubic feet
Maximum Sealed Box Volume
0.75 cubic feet
Minimum Ported Box Volume
1.50 cubic feet
Maximum Ported Box Volume
1.50 cubic feet
Top-Mount Depth (Mounting Depth)
Cutout Diameter
Shallow Mount Installation
Warranty and Return Policy
Parts Warranty Duration
3 years
Labor Warranty Duration
3 years
Warranty Provider

Item Details


Model Number:




Internal SKU:


Internal Product ID:


Product and How-to Videos

  • Infinity Kappa Subwoofers with SSI (Selectable Smart Impedance) 120.9W & 100.9W
  • Harman International: The Pursuit of Great Sound
  • Car Subwoofer Size Buying Guide | What Size of Sub Should I Get?

Customer Ratings & Reviews

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Customer Reviews

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GREAT sound

I have many years of experience in studio recording in the music industry - as a musician. So I was looking to build a system that can replicate the studio sound as best as I could to listen to a wide variety of music. I do not need thumping deep rattle the next car bass, I want clean musical sound. I have had alpine subs and those can punch and get some solid deep bass, but that was not my goal with this setup (although it can do that too, rather well). This is my 2nd purchase of this sub in a second vehicle and in both cases this has performed exactly what I needed. The sound of an upright bass sounds amazing, can easily go into the higher frequency range and make the transition from door speakers to sub seamless. I bought this sub to play anything I threw at it and do it well, not to only play one type of music all the time. Mostly Jazz, Classic Rock, Ska, 90's, Classical, Pop (wife likes that stuff..) and occasional R&B. I recommend the kappa components to go along with the sub - some say the highs are harsh, but I call it accurate and clear. This sub can do it all, I'm very happy with it.

TL;DR, get this amazing sounding sub for your setup if you want perfect sound and a strong presence. Might want to go larger than 10" or another brand if you want that deep killer decibel punch and trunk rattling bass;)

By Mike on August 16, 2014


found this helpful.

Awesome sub for the price

It hits hard and looks great. The 4 to 2 ohm switch makes setting up your amp easy. I'm running it with a mono block jl 500 watt amp and outs loud and hitting great.

By Adam on August 16, 2014


found this helpful.

car speakers

These speakers sound nice and balanced not to boomy but a good punchy bass and treble sound. They can handle whatever power amplification is fed to them. I would recommend them for their overall value and just crisp clear sound without the distortion.

By sam medina on May 23, 2014


found this helpful.

Infinity subs and speakers. Bad a** products

Love infinity products. The 100.9 is a great value and very good addition to any system they sous excellent and can handle the power. Highly recommend

By Cab300zx on August 11, 2014


found this helpful.

Great price on a great product

Good tight bass response, very durable, good price highly recommended.

By Jaym on September 26, 2012


found this helpful.

Great sub!

For a single 10", this sub hits hard. It looks even better. Hookup is flexible with the 2ohm switch. Makes wiring that much easier. Just what I needed to add clear bass to my system without annoying everyone else around me.

By Allan on August 19, 2012


found this helpful.

Sweet Sub

Nice smooth sound comes from this amp, looks great too!

By chad on April 8, 2014


found this helpful.

high quality

have lots of experience in the car audio industry and decided to get these after doing research on what i felt would be best for my setup. My last system had 2 L7 12s but this time i was looking to conserve a little more trunk space and was looking for more quality. put this in the recommended .75 sealed enclosure powered by a polk 5 channel amp and have been impressed so far. doesn't hit the lows like my last setup but for the size this really packs a punch. One of the most accurate sounding subs ive heard. going to try it in a ported box soon to compare.

By jeeves on September 25, 2013


found this helpful.

Great sound

Great item, sound is excellent , best item I brought, the value is ok.

By Anudra on October 23, 2012


found this helpful.

High Quality Sound

I ordered two of these and built a box to Infiinty's specs with 1" MDF. These sound so great! They don't play extremely loud (powered perfectly by a Kappa One) but they blend so well with the rest of the system. The sound is clean and hard, not boomy. On that note they can handle high volume, but if you want that slammin' bass in your face feel, these aren't for you (I know these are only 10's. but I'm confident the 12's are very similar). I am an Infinity loyalist in the car as well as home, and these remind me why!

By J Ro on September 3, 2013


found this helpful.


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