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Infinity 100.9w

Kappa Series 10" subwoofer with selectable 2- or 4-ohm impedance

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Our take on the Infinity 100.9w

by Dominic Devito
Infinity

What's a component sub and why would I want one?

A component sub is simply a speaker that's designed to reproduce bass once it's installed in a compatible enclosure. Think about the impact of a movie soundtrack in a big theater or even in your own home HDTV setup. A component sub can add the same kind of power to the music in your car. And a car sub is not all about the boom that you hear on a street corner (although that's cool too) - you can pair a component sub with your choice of enclosure to get bass just the way you like it, from tight and punchy to fat and loose. And once you experience music in your car with a well-tuned subwoofer, you'll never go back.

Infinity Kappa subwoofers combine great-sounding bass with the wiring versatility you need to build a system that can expand to meet your changing needs. And these enhanced woofers feature superior construction that makes the thump come easy.

The Kappa 100.9w 10" subwoofer features Infinity's unique Selectable Smart Impedance design, which lets you build exactly the system you want — high-power or multi-sub — without complicated wiring. Just flip the convenient impedance switch to safely choose between 2 or 4 ohms. If you're thinking about upgrading your amplifier or adding another sub down the line, this sub makes it easy to reconfigure — and it's nearly impossible to wire incorrectly.

This sub handles plenty of power and sounds great in sealed and ported enclosures, too. The coated glass-fiber cone offers remarkable rigidity that minimizes distortion, while the thick rubber surround promotes smooth excursion. Add the hefty cast aluminum basket to the mix and you've got proven delivery system for potent low end.

See more info on this item

Highlights:

  • 10" subwoofer with selectable 2- or 4-ohm impedance
  • coated glass-fiber cone with rubber surround
  • cast aluminum basket
  • frequency response: 25-400 Hz
  • power range: 50-350 watts RMS (1,400 watts peak power)
  • sensitivity: 89 dB
  • top-mount depth: 6"
  • sealed box volume: 0.75 cu. ft.
  • ported box volume: 1.5 cu. ft.
  • warranty: 3 years
  • Our 60-day money-back guarantee

Priced per speaker

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
Size
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10 -inch
Impedance
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2 ohms
Cone Material
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Coated glass fiber
Surround Material
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Rubber
Ideal Sealed Box Volume (cubic feet)
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0.75
Ideal Ported Box Volume (cubic feet)
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1.5
Port diameter (inches)
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3
Port length (inches)
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10.25
Free-Air
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Yes
Dual Voice Coil
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No
Sensitivity
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89 dB at 2.83 watts
Frequency Response
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25 - 400 Hz
RMS Power Range (Watts)
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50-350
Peak Power Handling (Watts)
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1400
Top Mount Depth (inches)
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6
Bottom Mount Depth (inches)
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6 11/16
Cutout Diameter or Length (inches)
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9 3/16
Vas (liters)
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18.05
Fs (Hz)
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33.8
Qts
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0.46
Xmax (millimeters)
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17.5
Parts Warranty
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3 Years
Labor Warranty
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3 Years
Product Research
What's in the box?

Download owner's manual

  • One 10" Woofer
  • Self-adhesive foam gasket
  • 3mm Allen wrench
  • Owner's manual (English/ French/ Spanish/ eleven other languages)
  • Technical data sheet
  • Warranty and on-line product registration information

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 open the box, verify contents, 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.

Features
Enclosure Compatibility
Specifications

Features

Selectable Impedance: For increased system flexibility, the woofer impedance is switchable. There is a 2 ohm/4ohm switch above the wire terminals, this provides easy configuration of the voice coil. The power handling is the same for either setting; 350 watts RMS/1400 watts peak.

Woven Glass-Fiber Cone: The cone material is extremely stiff, minimizing cone flex; this results in very low distortion and improved clarity.

Vented Polepiece: Venting the polepiece reduces air compression under the dustcap which minimizes mechanical noise and provides more constant mechanical Q for reduced distortion.

Terminal: The set screw wire terminals will accept bare wire up to 8 gauge.

Enclosure Compatibility

Sealed Box: Infinity recommends a sealed enclosure with an internal volume of 0.75 cu/ft.

Ported Box: Infinity recommends a ported enclosure with an internal volume of 1.5 cu/ft with one 3" diameter x 10.25" long port. This equates to a tuning frequency of 30 Hz. They also recommend using a sub-sonic filter.

Sealed Bandpass Box: When using a bandpass enclosure Infinity recommends a sealed rear chamber volume of 0.75 cu/ft and a ported front chamber volume of 0.75 cu/ft with a 4" diameter x 7.5" long port. This equates to a tuning frequency of 60 Hz. They also recommend using a sub-sonic filter.

Free-air Mounting: In addition to being compatible with sealed, ported, and bandpass enclosures, the woofer can be used in free-air applications. A free-air subwoofer is designed to be mounted on a baffle board, which separates the front of the speaker from the back. For instance, you could mount this woofer to a board attached to the rear deck or placed in the trunk against the rear seat. The trunk acts as the enclosure housing the subwoofer. Because there is no specific volume of air to stiffen the suspension, the free-air power handling is approximately half that of the woofer in a box, in this case 175 watts RMS.

Specifications

Thiele-Small Parameters: Because the woofer has two impedance settings, there are two sets of Thiele-Small parameters:

 
DC Resistance (Ω) 2.0 4.2
Inductance (mH) 1.17 1.17
Vas (liters) 18.05 18.05
Qms 4.18 2.43
Qes 0.51 .53
Qts 0.46 .44
Fs (Hz) 33.8 33.8
Radiating Area (m²) 0.033 0.033
Xmax (mm) 17.5 17.5
Motor Force Factor (TM) 12.47 17.72
 
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Infinity 100.9w Reviews

Average Customer Review:

17 people say:

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Filter by rating:
5 out of 5

infinity 100.9w

Written By Ted, Marshall MI on Wednesday, April 16, 2014
Crutchfield Customer Review (What's this?)
 
This hit very hard love them
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"Coolness Factor"
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5 out of 5

best sub ever

Written By jake, cadott, wi 54727 on Friday, January 31, 2014
 
Make sure you have a good amp cause this sub has lots of power.
Pros:
Power, infinity quality
Cons:
Price a little steep for 1 but way better than competition
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"Coolness Factor"
Build Quality
Ease of Use
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5 out of 5

Good Strong Punch

Written By JGrant, Atlanta, GA on Wednesday, November 20, 2013
Crutchfield Customer Review (What's this?)
 
This speaker is perfect for those unsure of how you want to power your subs and still gives the flexibility to change later with the 2/4 ohm selector switch. I wired two of these subs to a 1200w mono Kicker amp and was pretty impressed with the end result. Bass is accurate and provides plenty of punch wired at 300w per sub.
Pros:
Great looks, good construction, ohm selector switch.
Cons:
Fairly expensive, somewhat deep mounting depth.
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"Coolness Factor"
Build Quality
Ease of Use
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Value
 
5 out of 5

free air

Written By adam, rochester, Mn on Monday, October 21, 2013
 
I was looking for a free air sub to replace the factory sub in my 2005 deville. This is a great sub, im running a line out converter to my amp so it doesnt sound as good as if it were coming from rca's on a deck but that'll come here soon enough. Infintiy recommends 175 watts in free air applications but it can handle more. Im running it at 2ohms 250 watts rms.
Pros:
Build quality, selectable ohms, performance, can be used free air or in a box.
Cons:
None, its a high quality sub.
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"Coolness Factor"
Build Quality
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5 out of 5

great quality

Written By jeeves, vegas on Friday, September 27, 2013
 
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...............been looking to hear reviews of it in a ported box with just one sub and couldnt find anything so i ended up buying one. while the sealed enclosure is slightly more punchy( especially if listening to rock music that has double bass) i have to admit ill be keeping it in the ported box. produces what seems to be a wider range of frequencies and is still very accurate, also doesn't require my gain knob to be as high as it was in the sealed enclosure. i listen to all genres of music and feel ported was the way to go if you don't mind losing a little more trunk space
Pros:
originally was nervous about the gold but it looks very nice in person, great sound reproduction, easily switchable impedance.
Cons:
recomended ported box size is kind of big. Makes me wonder how the 12 inch version compares.
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"Coolness Factor"
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5 out of 5

Best low powered sub I've herd

Written By Joe, Michigan on Thursday, March 07, 2013
 
Best low watt sub you will ever hear. Very very accurate and clean.
Pros:
Sound quility
Cons:
None
3 out of 3 people found this helpful
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"Coolness Factor"
Build Quality
Ease of Use
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Value
 
5 out of 5

Infinity 100.9w

Written By anudra01, FL on Wednesday, April 11, 2012
 
I have an Infiniti G37 and I installed two of these badboys and it's the best. They are powered by an infinity kappa one and the bass hits really hard. I would recommend this sub to anyone.
3 out of 4 people found this helpful
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"Coolness Factor"
Build Quality
Ease of Use
Sound Quality
Value
 
5 out of 5

kappa

Written By huller, il. on Sunday, March 04, 2012
Crutchfield Customer Review (What's this?)
 
great speaker, has the infinity sound i was looking for . my last sub was about 11 years old and finally broke the voice coil wirers. that was also an infinity. so im glade i went with another great speaker. and getting it from crutchfield makes life easy. thanks! recomend this 10' sub to any good box. p.s has a cool factor look!!!
2 out of 2 people found this helpful
Was this review helpful?    Yes | No
"Coolness Factor"
Build Quality
Ease of Use
Sound Quality
Value
 
5 out of 5

Infinity 100.9w Kappa

Written By MikeG, South Jersey on Thursday, December 15, 2011
 
This subwoofer not only looks awesome but also sounds amazing. I have this thing in a sealed box under the back seat of my truck and man does it hit hard! As an avid listener of dubstep, electronic music and some hiphop, low end sounds are very important to me and the kappa woofer delivers. This is also a great sub to show off to your friends since the woven glass fibers look pretty cool and assure you that your cone will not be susceptible to breaking over time. Get the Infinity Kappa subwoofer, you will not be displeased.
4 out of 4 people found this helpful
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"Coolness Factor"
Build Quality
Ease of Use
Sound Quality
Value
 
3 out of 5

infinity sub-par

Written By agentorange, casper,wyoming on Saturday, October 01, 2011
Crutchfield Customer Review (What's this?)
 
well after reading all the reviews on this sub i thought what the heck? it sounds like a good buy. apparently i was wrong. I bought a sound ordnance box, sealed from crutchfield with the recommended air space and ran a rockford fosgate punch 300.2 amp to it bridged at 2 ohms, im not exatcly sure what the proper way to wire it is but the reviews said you can't wire it wrong. so it sounds alright with low pass but when you crank up the volume it makes a popping sound that i can not decipher. i am sure im only running 300 watts into it but it says its rated for 350 rms so im not sure whats going on....btw it sounded good in my wrx but when i put it in my jeep grand cherokee it sounded weak and made the popping noise.
3 out of 56 people found this helpful
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5 out of 5

Quality

Written By Dave (03 Mustang), WI on Sunday, March 27, 2011
Crutchfield Customer Review (What's this?)
 
Well, I have 2 of these installed in a custom box powered by Kenwood 1200m.
They sound great, they are very accurate and hit hard. You will not be disappointed! Great buy for the money, worth every penny.
3 out of 5 people found this helpful
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5 out of 5

A subwoofer with a little glam!

Written By Rob, Takoma Park, MD on Monday, March 14, 2011
Crutchfield Customer Review (What's this?)
 
If you are in the market to purchase a component subwoofer, look/spend no more. This little gem rocks! I have mine installed in a sealed box, paired with some Infinity Reference 6030cs' (installed in the front doors). Needless to say, I am quite pleased with the results. Oh yeah, the woofer... Get it! As someone else pointed out, you will NOT be disappointed. Just be sure, though, that it is powered by a mono amp; I have the Polk Audio - Monoblock PA880 which I purchased at Best Buy (Crutchfield does not sell it). And you should also run your door speakers by a separate 2- or 4-channel amplifier. Though two (2) amps total, the signals are segregated to where your music is much more cleaner and professional-sounding.
8 out of 14 people found this helpful
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5 out of 5

Beautiful Sound

Written By Enrique, Bronx, NY on Tuesday, February 08, 2011
Crutchfield Customer Review (What's this?)
 
It's a beautiful Sub that gets a lot of attention. Importantly, this sub sounds very clear and crisp not boomy like others. However, do not be fooled this sub has a serious punch factor.

I listen to hard rock, jazz, latin jazz and hip hop to R/B. All music sound just awesome, don't think about it, just buy it you wont disappointed.

5 out of 5 people found this helpful
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5 out of 5

In Custom enclosure in 300zx With Kappa 5 Amp

Written By Alexander1225, Florida on Tuesday, January 11, 2011
 
This sub is a sound quality sub, which can be seen by the price and specs. The sub sounds great and has plenty of volume in my small car. Overall i wish it was a little louder, but i would never give up the sound quality this guy provides, it is amazing. I would recommend this to a friend who isn't on a tight budget for a car audio system.
4 out of 6 people found this helpful
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5 out of 5

Extremely pleased

Written By Cmac06, Alabaster, AL on Saturday, January 23, 2010
Crutchfield Customer Review (What's this?)
 
I was looking for a sub that would fit in a sealed enclosure. Specifically, I was planning on putting a system together using the QLogic enclosures for Sub and Kick panels. This sub was a good fit because the sub sealed enclosure specs state the it needs .75 cubic feet of space, and the QLogic box for my vehicle was about the right size within 15%.

I actually spoke with a sales consultant about this, and he assured me that the specs were good for both items.

To test the setup, I hooked the sub up without any crossover, and I must say that this sub is extremely musical. It played well above the stated frequency range of 25-400Hz, but when tuned in to do its job, it was absolutely phenomenal. The bass in the setup is extremely punchy and accurate. Bass guitars sound absolutely incredible, as well as the lower octaves on a piano.

The only issue that I could see is the the resistance switch moves quite easily, so care must be taken when mounting the sub in an enclosure. Otherwise, I am very pleased with the purchase.
7 out of 7 people found this helpful
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5 out of 5

Infinity 100.9w

Written By Michael, NJ on Tuesday, January 05, 2010
Crutchfield Customer Review (What's this?)
 
This sub hits hard and clean. I was limited in box size and could only get 0.65 cu ft out of my box. I put some polyfill in it from day one and it hits HARD. The clarity is also amazing. Very tight. The construction is top notch and the cage is solid.

I am powering it with a Polk 1100.5. The amp is rated at 400w RMS at 2 ohms, which is the setting I am running the sub on.

Highly recommend.
3 out of 3 people found this helpful
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5 out of 5

wow!

Written By Anonymous, Northern California on Tuesday, October 13, 2009
 
Anyway everything I have in my truck is from crutchfield which includes an Alpine cda-105, alpine power pack, Infinity components, Infinity coaxials and infinity 600watts at 2ohm amp. I just put this sub in my Ford Ranger today in a small .85 box and wow does it hit. I dont even have it broken in yet but I'm pleased already. So far I've thrown Beastie Boys at it along with some CCR, Third eye Blind, Ben Harper and boy does it hit it all. Its very precise and clear. I can tell why Crutchfield added it to its Signature series. This is defiantly a well built product.
2 out of 2 people found this helpful
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2 questions already asked

Is this sub great for metal music? I need something that will provide great double bass kicks. Also, I listen to other types of music as well so should i go for a sealed box or ported? Thanks much appreciated! [ Fahd  Feb 03, 2014 ]
1 answer
  • Thanks for your question. For information on selecting the best sub 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 and help you make the best choice for your system. [ Krissy Staff  Feb 04, 2014 ]
What is the magnet measurement on the Kappa 100.9? [ Bobby  Jan 28, 2014 ]
1 answer
  • Sorry don't know not that involved but have plenty of quality sound. [ ANDREW D   Jan 28, 2014 ]

Add accessories for the Infinity 100.9w

We've verified that these enclosures are a good match for this subwoofer. See all categories & accessories

Sound Ordnance™ Bass Bunker Sealed dual 10" subwoofer enclosure (Model BB102-75S)
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Sound Ordnance™ Bass Bunker Sealed single 10" subwoofer enclosure (Model BB10-75S)
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Sound Ordnance™ Bass Bunker Ported single 10" subwoofer enclosure (Model BB10-125V)
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Sound Ordnance™ Bass Bunker Ported dual 10" subwoofer enclosure (Model BB102-125V)
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T-Spec 16-gauge Speaker Wire Black/white jacket — priced per foot
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T-Spec 12-gauge Speaker Wire Black/white jacket — priced per foot
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Stinger PRO Series 16-gauge Speaker Wire Black jacket — priced per foot
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Dynamat 19100 License Frame Kit
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Dynamat Xtreme Wedge Pack 1 sheet, 4 square feet
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Dynamat SuperLite Tri-Pak Triple package — 3 sheets, 12 square feet (Model #10612)
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Dynamat Xtreme Trunk Kit 5 sheets, 20 square feet
12 people say
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Dynamat Dynaliner One 54" x 32" sheet (1/8" thick)
6 people say
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Metra Speaker Terminal Round terminal cup with binding post connectors (for do-it-yourself box builders)
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Metra Box Carpet Carpet roll (54" x 5 yards) — available in 3 colors (Black)
21 people say
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Polyester Fiber Stuffing Make your subwoofer think it's in a bigger box (1-pound pack)
33 people say
Your Price: $12.99
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Metra Speaker Terminal Round terminal cup with spring clip connectors (for do-it-yourself box builders)
5 people say
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Metra Speaker Terminal Square terminal cup with binding post connectors (for do-it-yourself box builders)
6 people say
Your Price: $9.99
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Metra Speaker Terminal Square terminal cup with spring clip connectors (for do-it-yourself box builders)
7 people say
Your Price: $3.99
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Port Tube 3" diameter, 4-1/2" long
1 person says
Your Price: $4.99
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Autosound 2000 Disc One Low Frequency Test CD (Disc One)
1 person says
Your Price: $19.99
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Autosound 2000 Disc Four Amplifier Optimizer Test CD
8 people say
Your Price: $9.99
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For a more in-depth review and enhanced detailed information on the Infinity 100.9w, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_1081009W/Infinity-100-9w.html ).

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Compare with other Infinity models

  • Infinity 100.9w
  • Get selectable impedance and improved bass accuracy
  • 5 out of 5: In Stock
  • The Infinity 100.9w
    • lets you easily select between 2- and 4-ohm impedance
    • handles 350 wtts RMS
    • features a rigid glass-fiber cone for precise low end
  • Add To Cart
    $199.99
  • Infinity 1060w
  • 10" 4-ohm Compnent Subwoofer
  • 4.5 out of 5: In Stock
    • The Infinity 1060w offers:
      • polypropylene cone with large-roll rubber surround
      • 25-400 Hz frequency response
      • 100-275 watts RMS power range
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  • Infinity 100.9w
  • 10" Dual Impedance Component Subwoofer
  • 5 out of 5: In Stock
    • The Infinity 100.9w offers:
      • coated glass-fiber cone with rubber surround
      • 25-400 Hz frequency response
      • 50-350 watts RMS power range
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    $199.99
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