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Infinity Kappa 120.9W

350W 12" Kappa Series Single Voice Coil Selectable Smart Impedance Subwoofer

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Infinity Kappa 120.9W

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Single 12" Sealed MDF Subwoofer Enclosure (Belva MDFS12)

$31.99

Special Price $23.99 ($31.99 if purchased separately)

Single 12" Sealed MDF Subwoofer Enclosure (Belva MDFS12)

• 3/4" Medium Density Fiberboard Construction
• Durable Black Carpeting
• Pre-Lined with Poly-Fil
• Gold Speaker Terminals

(Offer 1 of 1)

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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:

  • 12" 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: 23-400 Hz
  • Sensitivity: 91 dB
  • Authorized Internet Dealer
  • 1 year Manufacturer's warranty

Package Includes:

  • 120.9w SSI Subwoofer
  • Foam Mounting Gasket
  • 3mm Hex Wrench
  • Owner's Manual
  • Technical Data Sheet

Read more about the 120.9W at our blog.

Product History:

Infinity 120.9W thumbnail
(newest, current model)
Infinity 124.7w thumbnail
(previous model, replaced by Infinity Kappa 120.9W)

Subwoofer Specifications

Subwoofer Series
Each subwoofer manufactured is part of a series. This is the name of the subwoofer's series.
Kappa (Infinity)
Subwoofer Size
Refers to the diameter of the subwoofer, measured in inches.
12"
Peak Power Handling
Peak power handling refers to the amount of power a speaker can handle during a brief musical burst. The RMS power range figure is a much more reliable rating for determining the speaker's power requirements. The Peak power handling specification is typically rated per speaker unless otherwise noted.
1400 watts
RMS Power Handling
The RMS power is the amount of power the speaker requires to operate safely and properly. RMS Power Handling refers to the amount of power a speaker can handle on a continuous basis. We recommend powering your speakers or subwoofer with 80%-120% of its recommended RMS rating. The RMS power handling specification is typically rated per speaker unless otherwise noted.
350 watts
Voice Coil(s)
Dual voice coil subs have more wiring flexibility than single voice coils subs; however, single voice coil subwoofers provide easier hookup options for wiring multiple subwoofers in parallel or series. You may also run a dual voice coil (DVC) sub in parallel, series, or combination. A quad voice coil has four voice coils and is equal to two dual voice coil subwoofers as far as wiring goes.
Single
Impedance (Per Voice Coil)
The load value (in ohms) that the speakers present to the amplifier per voice coil - the amount of resistance to the current flow. This is a key specification as subs wired in parallel or low impedances can create problems with your amplifier and potentially void all warranties. We encourage you to ask our support department prior to purchase if you do not understand which impedance level will suit your application best.
2 or 4 ohms
Frequency Response
The range of frequencies the speaker will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
23 - 400 Hz
Sensitivity
An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
 
Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
91 dB
Xmax (millimeters)
Typically measured in millimeters, the Xmax value is the measure of a speaker cone's maximum excursion in one direction while maintaining a linear behavior.
17.50 mm
Subwoofer Design
This is the design of the subwoofer or the opening of the subwoofer enclosure. Each design has it's own benefits, whether it is a square, circle, or oval.

Round/Circle: This is the typical and common subwoofer design. They have a round cone and are a circle in design.

Square: These woofers are able to achieve a greater cone area in a smaller space. Because of the greater surface area, some square subwoofers will be louder than a round subwoofer of the same size.

Round / Circle
Main Cone Color
This is the color of the speaker's or subwoofer's cone.
Gold
Woofer Composition
Lightweight woofer cone materials are essential for efficient operation. Poly cones produce exceptional sound and are sturdy against various changes in temperature. Paper cones are very efficient, and when treated for moisture resistance, will perform at a high level. Poly refers to polypropylene, which is thermoplastic or fibers that are polymers of propylene. IMPP refers to injection molded polypropylene, a commonly used process and material in speakers.
Coated Glass Fiber
Woofer Surround
A speakers surround is part of the suspension system. The surround protects the cone and prevents it from being displaced as it flexes out from the basket. It is usually made of a durable material like treated foam or rubber in order to withstand the strenuous job of producing bass frequencies.
Rubber
Subwoofer Grille
Most subwoofers are able to accommodate a universal grille; however, some subs include a grille and others have a specific, optional grille available for purchase separately. If "yes", then the subwoofer includes a grille. If "optional (sold separately)" the matching grille will need to be purchased in addition to the sub.
No
Re-Cone Kit Available
Some higher end subwoofers have replaceable cone assemblies. In case of a blown woofer, a recone kit allows for a simple replacement, as opposed to purchasing an entire new subwoofer.
No

Recommended Enclosure Specifications

Recommended Enclosure Type
This is the recommended type of enclosure that the subwoofer should be installed into. Some subwoofers are specially designed for particular enclosures.

Sealed: These enclosures completely enclose the air inside the box. These boxes produce a tight bass.

Ported/Vented: These enclosures have a slot of air to escape from the box. The result is a sound that has more "boom".

Bandpass: These are a combination of both sealed and ported enclosures. They can be very efficient, but require tuning for the best response.

Ported / Vented
Sealed
Minimum Sealed Box Volume
This value indicates the minimum sealed box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
1.00 cubic feet
Maximum Sealed Box Volume
This value indicates the maximum sealed box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
1.00 cubic feet
Minimum Ported Box Volume
This value indicates the minimum ported box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
2.00 cubic feet
Maximum Ported Box Volume
This value indicates the maximum ported box volume that the manufacturer recommends for the subwoofer. The volume is typically displayed in cubic feet.
2.00 cubic feet
Top-Mount Depth
The depth when installed on top of the mounting surface. Measured from the bottom of the speaker's magnet to the bottom of the mounting holes on the rim of the speaker.
6-5/16"
Cutout Diameter
The actual diameter of the hole you will need to cut out if you are creating a new mounting location for this speaker, or if you are mounting a subwoofer in a box.
11-3/16"
Shallow Mount Installation
This means that the subwoofer/speaker is designed to be installed in areas that do not have a lot of space. Shallow mount subwoofers are typically found under a seat or behind the seat in some trucks.

Shallow mount speakers will typically have a mounting depth of 2" or less, while shallow mount subwoofers will typically have a mounting depth of 3" or less.

No

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
81%
4 Star
11%
3 Star
5%
2 Star
3%
1 Star
0%

Average Attribution Rating

Durability
4.7
Value
4.8
Features
4.9
Design
4.8
Usability
4.9
David

Aiken, SC

Overall
Durability
Value
Features
Design
Usability
Hidden Gem!

August 20, 2014

The Infinity Kappa 120.9w is certainly a hidden gem! I almost didn't give it a shot because of the gold look (I prefer plain black - or something not flashy), but I'm glad I gave this subwoofer a chance!

I have it powered by a Soundstream RUB1.1000D monoblock amplifier, at 4 ohms. The amp can put out 800 wrms at 2 ohms. The amp is rated for 600 wrms output at 4 ohms.

My opinion is that Infinity has greatly underrated power handling capability on this subwoofer. 500-600 wrms I'm putting to it has not even pushed it to it's limits yet.

The woven fiber cone is extremely stiff (less chance of cone flex and high volume distortion) yet very light weight (the motor on this thing with 500+ watts to it moves the cone effortlessly and with great control.

I've not been able to get the thing to distort even at max volume, unless the amp is going into clipping from improper gain setting. With the gain matched perfectly so I get max power with no clipping, the subwoofer takes it all and reproduces sub bass brilliantly.

Transient response is excellent. Very fast bass guitar, electronic bass, and double kick drums are all reproduced faithfully and clearly. Versus the previous subwoofer I had in the car, I can hear MUCH more sub bass detail in music - that I didn't even know was there, as the other sub muddied it up.

It's transient response and fairly flat frequency response in a sealed enclosure also help it blend very well with the front stage. With very little tuning I was able to get it blended perfectly so it doesn't sound like a bassist is dancing his way from my trunk to dash and back, or like there is a bass explosion going off in the trunk, completely separate from all the other parts of the song.

Though this subwoofer is very accurate and sounds great with no audible distortion, it still gets LOUD for 1 12" in a sealed enclosure.

In fact, it causes quite a bit of panel flex on the vehicle (Lexus, mind you - very tightly and well built), and gets to the point where it's almost too loud (and I used to be a bass head - now having switched more towards sound quality builds) - for my wife it is certainly way too loud if I crank it up, lol - the look (er, grimace) on her face...priceless.

If Infinity keeps building subs like these, and the word keeps getting out, they should do quite well in sales. These are hands down the BEST SUBS FOR THE MONEY I've ever owned. I've paid more for ground pounders with crazy power handling and excursion limits, and paid less for budget subs. For the price, I definitely give these best overall subwoofer - sound great for sound quality builds, but still capable of getting quite loud and shaking everything.

The construction quality of this woofer tell me it will last - they did not use cheap parts on this. The speaker wires are easy to connect (no soldering) with hex screws (allen wrench supplied by Infinity in package).

The ohm switch is easy to use - the number not covered by plastic, and thus brighter, is the one you have selected. Flick the switch easily from 2 ohm to 4 ohm. This is a fantastic feature I hope more woofer manufacturers go with in the future!

29 of 51 found this helpful

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Carter

Fort Worth, TX

Overall
Durability
Value
Features
Design
Usability
Built like a Tank

June 11, 2013

I've got this in a sealed box and bridged to a Clarion giving it only 180w plus an EQ boost and it will shake the eyeballs out of your sockets. Integrates well with Polk component 6.5s. I'm thinking of building a HT sub using it as the driver.

24 of 42 found this helpful

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kenneth

Union City, IN

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Durability
Value
Features
Design
Usability
Great Quality

June 16, 2014

Product as described great speaker superb sound quality very fast shippers got products within two days.

25 of 45 found this helpful

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Robert

Sewell, NJ

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Durability
Value
Features
Design
Usability
Great Sub - SQL?!!

April 26, 2014

I bought this sub after reading many positive reviews about how it was a very nice SQ sub, so sound quality is what I was expecting. What I wasn't expecting was for it to be as loud as it is. This sub will go low and loud, and sound great doing it. The bass is tight and accurate at all frequencies. I have it in a 1 cu ft sealed enclosure, running about 400 watts RMS @ 4 ohms. It really turned out to be a better sub than I was expecting. I'm not sure there is a nicer sub at this price point (about $140). Amazing, really. (Looks great, too!)

26 of 47 found this helpful

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Michael

Zachary, LA

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Durability
Value
Features
Design
Usability
Amazing sub for the price

December 19, 2012

I originally had an Infinity 1262w reference sub and the voice coil separated one day. Rather than trying to get a refund or warranty work I decided to get an upgrade and go with the Kappa. I now wish I had gone with the Kappa in the beginning! The sound is amazing. My box is sealed for clean tight bass and this sub delivers. I don't care for people to hear me coming a mile away but this sub is incredibly loud inside my car. To the point that people who listen to it generally have to plug their ears.

I am only putting about 300w into it but it can shake my entire car and still play cleanly without any boominess or muddy distorted sound. I don't always listen to music like rap or hip-hop, so when listening to classical music or country the bass is supremely clear and not overpowering. I couldn't ask for a better sub for the money!

20 of 36 found this helpful

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gb

Canada

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Durability
Value
Features
Design
Usability
Excellent purchase

September 24, 2012

I installed this sub in a BMW X5 to supplement the bass on the Hi-Fi system. Wow. This sub provides deep, clean and rich bass. Way more that my ears can stand. Bonus, it looks great.

21 of 39 found this helpful

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Troymajesty

Trenton nj

Overall
Durability
Value
Features
Design
Usability
Infinity kappa sub woofers

February 1, 2014

Words can not explain the quality of these subs they are absolutely the best subs I have ever purchased, the bass out of these subs hits so hard and clean u won't believe it, overall, in my opinion they are the best.

16 of 30 found this helpful

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Angel

Canada

Overall
Durability
Value
Features
Design
Usability
Nice sound quality

July 1, 2012

I'm 44 years old and this is my first sub...

This being said, I have always been a music enthusiast, and I'm very hard to please, I need a good sound quality system, and this sub was exactly what I was looking for!

I changed everything in my car, radio, front and back speakers, and put a nice amplifier to go with it, the only thing missing was bass...

After going over mountains or reviews, I finally decided to go with Infinity, I bought one of these, that I put in a sealed box, WOW this sub makes my car shake to the core!

Incredible bass in my car, but only in the car, I did not want the bass to overwhelm my vocal, and this sub blends perfectly with the front stage,
I threw everything at it, Pop, Rock, Metal, Techno Bass, even Classical!
It reproduces every note to perfection, bass sound like bass, drums sounds like drums.

I tried the sub a both impedance's, first a 4Ω, then at 2Ω, my amplifier sends 300w at 4Ω and 500w at 2Ω, worked perfectly at 2Ω but was a little to much for my taste so I put it back at 4Ω.

all in all this is a very nice peace of technology, and the price is respectable compared to other SQ subs out there, and I highly recommend this product.

If you are a Hip Hop fan, one will not be enough for you, two 10" or two 12" will shed the rust from your car in no time flat...

17 of 32 found this helpful

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Danny

Gastonia, NC

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Durability
Value
Features
Design
Usability
Awesome.

April 4, 2014

I bought this trying to upgrade my old system. I wanted better sound, not more sound. The bass, the kicks, low end sounds sound like what they are, not just boomy bass. Its not as loud as my old subs but I went sealed this time instead of ported. Hits hard on high and low bass. Plus, looks freaking awesome. May not be as loud but it is so clear. Dont get me wrong, its still loud..... Btw, be careful with the Ohm selector switch, which is cool btw, I had it on 2 ohms and my amp was pushing 850 watts to it for weeks. It took it like a champ though. I WILL be getting one more eventually.....

19 of 37 found this helpful

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Bo

Nashville, TN

Overall
Durability
Value
Features
Design
Usability
Just as good as JL w3v3's... and better for a smaller box

November 20, 2010

I have 2 of these remarkable subs in my Camaro. I have them set to 4 ohms, and I'm driving each sub with one JL Audio 500/1v2 amplifier... They handle the power very well, I have each JL amp set two-thirds of the way up. The sound quality is brilliant, and the bass is very deep sounding, even for the 1 cubic foot per side enclosure they are in. These sound just as good (and look way better) as the JL w3v3's- I've owned some before. The switchable impedance makes these subs very flexible... I'll probably own mine till I'm 40 yrs old! The only thing to pay attention to is their relatively large cut-out diameter... They won't fit into the same opening size as the Reference 12"s will (too big across)... So make sure your enclosure can accomodate these big boys. They are solid and weigh almost as much as Alpine Type R's, while being more effecient and clearer sounding. 5 stars on these!

22 of 43 found this helpful

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Josh

Malta, New York

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Durability
Value
Features
Design
Usability
Excellent Speaker

March 15, 2010

A have been using for over 6 months. It is giving the response that I expected. Good high quality sound. I would definitely recommend this product to others.

9 of 17 found this helpful

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Corey

Elkridge, MD

Overall
Durability
Value
Features
Design
Usability
Very nice subwoofer

October 20, 2014

I have this subwoofer in a 1 cu ft box and it is receiving 270 watts @ 4 ohms by a Precision Power 900.5 amp. The bass is very tight and deep and it is a noticeable improvement over the Diamond D3 that it replaced. I primarily listen to hard rock/heavy metal so I wanted a subwoofer that was punchy, clean and could consistently hit the low notes to round out the sound. This subwoofer could absolutely handle more power than I am giving it, which is nice to know if I ever decide to upgrade my amp. Cosmetically this is one of the best looking subwoofers I have ever seen and the gold, "woven" finish makes it look classy and expensive. I would highly recommend this subwoofer.

22 of 44 found this helpful

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thisdieingdream1

harrisburg pa

Overall
Durability
Value
Features
Design
Usability
is that 212s?

April 28, 2014

Hi,

I ordered the infinity Kappa 12.9w. A few weeks ago. I have it hooked on an Alpine mrp-m500. In a sound ordnance box,I believe a 1.6 or 1.8 vented inclosure. Its set a 80 Hertz at normal voltage and 6 db tuned right with the bass on my Alpine hde-148bt head unit. Beautiful combination. People ask me if its 2 12s. On the outside its not much but set inside and wow. It pounds. I also have a Alpine mrp-f300 powering infinity Kappa comps and 6x8 coxials. It gets loud!. This comment is after I already had a infinity Kappa 12.9w so yes I now have 2 12 inch subs. 1 in each sub enclosure. The enclosures are the same. Same amp and wow. I makes my teeth clatter. My wire is 0 gauge nvx. Great wire. I'm going to be getting the infinity Kappa one amp and Kappa four soon to boost up the power. But so far great. Also thank you sonic electronix for great prices!!!

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Jacob

San Antonio, TX

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Durability
Value
Features
Design
Usability
Couldn't be happier

November 24, 2011

I have owned this subwoofer for 4 months and I couldn't have been happier. I can't say anything negative about this subwoofer. There are many great thing about this subwoofer.

1. It works well in a compact box.

I have it in a 1.0cu ft sealed Sonic sub box stuffed with polyfill. Unlike many car subwoofers, this one is actually optimized to work in reasonably small sealed boxes (1 to 1.5 cu ft). WinISD recommends 1.2cu ft when running in 4ohm mode and 1.7 cu ft in 2 ohm mode. I run it in 2ohm mode, in effectively a 1.25cu ft box (due to polyfill), with resulting qtc of about 0.76, which is almost perfect.

2. Good sensitivity and power handling.

Don't worry if you have a modest amplifier. This subwoofer can still get very loud when running off a 250watt RMS power, much louder than is actually necessary IMO. However, should you want to play it a little too loud, I don't see why you could power it with 500w amplifier. Harman Kardon is being obviously modest with subs power rating. The xmax figure alone suggests that this Kappa should take up to around 500watts while still operating in its "SQ" range.

3. The cone looks great.

4. Low Inductance. Most subwoofers have such high inductance that their manufacturers do not even report it. This sub has Le of around 1.18mH which is considered much better than average. Low inductance is generally good for transient response and blending with the front stage.

4. Great sound.

Let's finally get to the core of the review. This subwoofer plays very cleanly and transparently. What I hear is a very clean, robust bass with a good texture. It's good for practically any music genre. Midbass output is higher and cleaner than that of an average car sub, which makes blending with the fronts much easier. Don't be afraid to bump your crossover frequency a little higher. (I have mine at 70Hz, up from 60Hz with previous sub). I could go on to continue building a list of things that this subwoofer does correctly, however, I think it would be much easier to say that it does nothing wrong IMO.

Based on what I have heard so far, most Harman Kardon (owner of JBL and Infinity) subwoofers are very good performers, and this subwoofer is a proof of it. I feel like I have been converted. Should I look for a higher end sub in future, once I become rich and famous, I will probably pick up a JBL WGTI from the same company.

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Peter

Ohio

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Value
Features
Design
Usability
Better then W6:D

December 2, 2014

I've had many subwoofers in the past cvr's w6 re audio american bass sony(lol) etc....i've never had one that i enjoyed the sound so much. It was exactly what i wanted all along. Not crazy loud and not to quiet to notice. Although for 1 12 it gets LOUD but still sounds good. I have it in a 1 cu ft sealed box. At first i had my jbl gto501ez giving it 350 rms while it was breaking in but i was wanting a bit more out of it. so i turned it to 2 ohm. which is super easy. I love that about it. No need for lots of wires :P with 500 its like a all new woofer:D super loud and even better sounding. I believe this sub can handle more then its rated for. It was barely moving on 350 and i know gto501ez is underrated. Awesome value. Awesome sq. Super spl:) not to much though!

21 of 43 found this helpful

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GuitarGod

Gastonia, nc

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Durability
Value
Features
Design
Usability
Great value

October 17, 2014

I have owned many, many subs in my life but these are the cleanest, clearest, most accurate sounding subs I have ever heard. I pushed 800 watts rms into one of these and it took it like a champ. Great value and great sound, they sound incredible......

5 of 11 found this helpful

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Peter

Ohio

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Value
Features
Design
Usability
Perfect:D

May 23, 2014

I bought 1 of these from here a few months ago. First impression was the sound is amazing. I was very surprised by how accurate it was playing yet still so loud in a 1 cu ft sealed enclosure. I've had lots of subwoofers cvrs w6s american bass. Ive had 10s 15s 12s. I wanted this subwoofer to go with a new brand setup i decided to do. Which was jbl gto 6.5s and 6x9s with the gto501 and the gto504 amps. IMO the sound is fantastic the speakers are loud yet sound good doing it as well as the subwoofer. I can honestly say all the products are amazing and i would recommend any of them. I didnt buy all the things from here but i found the 501 and 504 at about $110 each. When i first bought the subwoofer before hooking it up i contacted infinity and asked if the subwoofer could handle the 500 rms off the jbl amp and they confirmed it would work just fine and wouldnt mess up the warranty from over powering if it were to break. The only reason i did that is i had a 15 in a 3.0 cu ft enclosure it was very loud, but wasnt what i wanted. I thought the 12 wouldnt give enough output for my liking. However after hearing it for the first time ive been so amazed with the output that i havent changed it from the 350 rms at 4 ohms to 500 at 2 ohms. It would probably amaze me more but i dont even need it. Plenty of output. Its the best subwoofer ive ever owned. It looks really nice. Heavy magnet and interesting with the 2 to 4 ohm switch. I love it. Since the first time hearing it ive noticed it breaking in getting louder an lower so i cant stop listening to it. If im in my car im playing it loud an loving every minute on any genre of music.

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AwsedreswA

Hampton, VA

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Value
Features
Design
Usability
Nice enough

August 23, 2012

In a Sonic Sub Box: 1H12-1.0 (Gray) with dynamat on the inside to get closer to the 1.0 cubic feet spec. Drilled through the connector plate and ran monster cable 10-gauage speaker wire straight from the amp to sub.

Powered by Infinity Kappa Five (300-600W on the mono sub channel),
running 4 gauge and the BOSS cap-20.

Can make 2002 Monte Carlo SS rearview mirror fall off. I think I had it set at 320LP with the db gain set somewhere between 60 and 80hz (I think). A 160LP might be what its on now, I was having a problem with my amp cuttin out, so I reduced the high frequencies from the deck too and the system can run at max volume now. The 400hz max range was kinda much to believe anyway (from speaker or amp@320).

Once I get the candy amp rack made I think I'll pick up Infinity's other sub amp and give this thing the power it wants.

Great deal for the price, lets you get the extended warranty option. Decent look and VERY durable, but won't look pretty after it shows you it is durable (the shimmer wears off).

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Rael

Oklahoma City, OK

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Value
Features
Design
Usability
6 month review...

March 12, 2012

I have this driven by a Pioneer GM-D7500M in a custom built cabinet. 4 Infinity Kappa 63.9i driven by a Pioneer GM-D9500F rounded out my system. The sound quality is truly amazing. I've had several audiophiles and musicians in my car and they want the me to do the same system for them.

18 of 37 found this helpful

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Beau

Nashville

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Durability
Value
Features
Design
Usability
smart subs for audiophile taste

March 26, 2011

I have 2 of these Kappas, each being driven with a JL Audio 500/1v2 high-damping amplifier. I have the impedance switch set to 4 ohms on each sub for better excursion control. Let me tell you this, these Kappas reproduce every range of bass like a pro... very detailed yet extremely hard hitting. I have them in a sealed, 1 cubic foot per-sub enclosure, and they handle every bit of the amps' power (gains set at two-thirds) using common sense with the volume control/ bass knob. If you want remarkably precise sound that can still rumble the car very well with enough power, these Kappa's will do the job for sure. The impedance switch is very nice. Make sure your enclosure cut-out diameter is large enough... the mounting diameter of these subs are 11 & 1/8 inches across. You can always sand out your box holes with 40-grit sandpaper to make them fit, but it's some work (and vacuuming dust). If you want superb sound, go with these in a sealed box, they would probably work fine in a ported setup also, but the average person with little experience with boxes who likes tight, accurate bass should be very happy with these Kappas in a sealed enclosure.

19 of 39 found this helpful

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Mextrom

klamath falls

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Value
Features
Design
Usability
awesome subs

September 23, 2010

I bought two of these subs six months ago and they have amazing sound quality! They are in a very small truck box underneath the back seat of a 2006 dodge ram. Total air space per sub is .65 cub inches. I was amazed at how low of a frequency they could reproduce in an enclosure that small! Throughout the whole frequency spectrum these subs are amazing no matter what kind of music you listen too. I am very pleased once again by the quality and design of Infinity. These subs are a great deal and you will enjoy the quality of their tonal reproduction from 28hz up!

11 of 23 found this helpful

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alex

orlando, FL

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Value
Features
Design
Usability
good lookin nice sound

June 15, 2010

i powered 2- kappa 12" on a kappa one amp. they sound really good and looks great. I guess there's a manufacturer defect - the coil from the frame to the cone cam off. very disappointed in the subs, but sonic is highly recommended. great service, tracking orders, ease of return.

7 of 15 found this helpful

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Scott

Fargo, ND

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Value
Features
Design
Usability
Sound Quality for sure

April 27, 2010

This is a great sub with very good sound quality. I had two of these and the bass was good but not really loud if your a true bass head.

16 of 33 found this helpful

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nathan

Fargo, ND

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Value
Features
Design
Usability
Love em!

July 19, 2014

Great clear sound, really clean, built to withstand a bomb blast, let em break in nice, sound awesome, gotta love Infinity. Great working with Sonic. Product arrived in three days. Nothing but positive things to say.

12 of 26 found this helpful

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jamie

warrensburg, IL

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Durability
Value
Features
Design
Usability
Great but not extraordinarily so

June 24, 2014

This sub is excellent. Really fast shipping and customer service from sonic as well. To set the scene this sub was put in a boat. No need to rattle windows down the street. Sealed box roughly 1cf and an infinity kappa one 1600 watt mono block amp. Even at 2ohm which should equal close to 800 watts on this amp it was crisp clean and was louder than anticipated. Impedance switch works flawlessly. My only thing is that it seems like it doesn't go down and grab really low frequencies as well as other subs I've heard. Maybe it needs to be broken in but for now it is still pleasantly crisp and clear and I will definitely make a statement in party cove

17 of 36 found this helpful

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Anisimov

Israel

Overall
Durability
Value
Features
Design
Usability
Subwoofer

June 8, 2014

Very nice Infinity Kappa 120.9V.
Great sound. Great style.
I would recommend buying.

10 of 22 found this helpful

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Taylor

Tacoma, WA

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Durability
Value
Features
Design
Usability
Awesome!

October 3, 2013

This combined with the 1300a amp is very impressive for the money. I've had a lot of different setups and I regret everything I've bought in the past. This single 12 and cheap amp sounds better and hits almost as hard as my 2 type r 12's with a Hifonics colossus. I wish I would have bought this sooner.

4 of 10 found this helpful

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3d-audio

SLC, Utah

Overall
Durability
Value
Features
Design
Usability
Audiophile Bass

February 9, 2013

I used a pair of the Infinity Kappa 120.9W's in a home, high-end audio system. I put them in 3 Cu. Ft. sealed boxes and placed one in each corner of the audio room. The Apogee Divas are closer to the listening chair, so the sub-woofers are behind them. The bass is awesome. I have heard many high-end subs and these are as good or better than some of the expensive high-end subs. With a db or two of boost at the low end, these subs go down nicely to 20 Hz.

14 of 30 found this helpful

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ErichRN

tacoma wa

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Durability
Value
Features
Design
Usability
ErichRN

August 8, 2012

Had 2 in 2 sealed 1.2cf boxes they sounded good about 4 months and they tore all the way around. The fiberglass cone has a rough edge where it is glued to the rubber surround and cut the rubber. I tried to glue them but never sounded right. It's too bad they just didn't smooth the edge of the cone before gluing. I exchanged them for power caustic mofo that don't sound as good but much stronger. Do not use stated power cut in 1/2 for vented box keep ur warranty and packaging.

2 of 6 found this helpful

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TC

Canada

Overall
Durability
Value
Features
Design
Usability
Excellent Sub

April 28, 2012

I wanted to add some low frequencies to my X5 which did not seem to play below 100 hz. After a lot of research, I selected this sub and hooked it up to a JBL GTO3501 mono amplifier. Could not be happier. I wasn't looking for kick *ss bass but rather fill the cabin with low bass that I can feel. This setup rocks. It will kick if you want it too but what I like best is the flexibility it has to sound excellent with all kind of music. It took some time to properly tune the amp and well worth it.

17 of 36 found this helpful

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t buck

hartford

Overall
Durability
Value
Features
Design
Usability
Kappas kick butt

March 3, 2010

i got two of these subs for Christmas and now since they are broken in I can really see why infinity is top notch. the bass is so clear and the variable impedance switch should be on every new subwoofer.

6 of 14 found this helpful

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Joseph R.

Farmington Hills, MI

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Durability
Value
Features
Design
Usability
Awesome clean bass

June 4, 2014

These are great, I listen to country and rock and dance and dubstep and it all sounds awesome. They might not fit in your enclosure, if not just sand the enclosure holes down a bit. They shipped quick from Sonic at a great price. I started with one and I wasnt quite satisfied even after upgrading my amp to 500 watt jlaudio jx500/1d so I bought another and now I have two 120.9 in individual enclosures sealed 1 cu ft each. They hit hard and sound awesome, im upgrading the amp again! I also want to mention that they are not quite as loud as you may expect or want and I say that because I was rocking a single 12" Rockford HE2 from the oldschool and I replaced it with one 120.9 and although I heard a drastic rise in sound quality, It was not as loud as the he2 and not loud enough for my liking. Two of them with the same amp is loud enough.

7 of 17 found this helpful

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nickd

Iowa

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Durability
Value
Features
Design
Usability
infinity speakers!

May 9, 2014

120.9W is one of the cleanest sounding subs I have ever heard, and literally beats speakers that cost double. I have it powered with an alpine Mrx v70 at 2 ohm. Paired with two sets of kappa components full sound deadening and custom built box. I have not heard a better sounding system in a car. Infinity makes incredible speakers.

7 of 17 found this helpful

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J

pleasanton

Overall
Durability
Value
Features
Design
Usability
120.9 head turner

March 12, 2012

The kappa series is awesome looking. I have a 500 watt amp powering this baby in a custom enclosure in the trunk facing front through a pull down backseat. Lows sound great and bumps the car nicely with various music. The biggest reaction you get is from the looks of the thing. Other than that it's not rediculously loud so 1 of these won't rattle the neighborhood. Honestly though I don't see the need for another one.

4 of 11 found this helpful

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Damien

Bermuda

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Durability
Value
Features
Design
Usability
Nice Sub

April 13, 2010

I love the look of this sub especially because it looks like the rest of my kappa speakers. The bass is nice and tight in a 1.0 cu ft box but it doesn't seem to like rolling bass to much. Then again that might just be my application but all in all it is a great sub.

6 of 15 found this helpful

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Derek

Pullman, WA

Overall
Durability
Value
Features
Design
Usability
Great value

May 28, 2014

For as long as I've had my car I have never had a sub I was truly happy with, until I got the 120.9W. For the price, I just don't think it can be beat. Sounds great listening to EDM or rock music. It is responsive and tight. It's genuinely a pleasure listening to it.

In my system it is powered with a Kenwood X500-1 with the crossover point around 90-100hz.

8 of 21 found this helpful

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Jason

Canada

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Value
Features
Design
Usability
Sounds sooo good

December 29, 2014

I love this 12! Recently, I've owned JL, Alpine, Pioneer but this is my favorite in a sealed 1 cu. ft. box. The sound of the sub blends perfectly with my 6.5 components up front and my 6.5 coaxials in the back. I'm finally just enjoying the sound and music and not constantly trying to eq the heck out of the sub to get it to sound right. I don't think you will be disappointed with this sub, excellent build quality, excellent sq and looks beautiful...I'd definitely recommend.

19 of 44 found this helpful

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Accessory Tools and Products

Accessories added

Single 12" Subwoofer Angled Truck or Hatchback Box Enclosure

CARB Compliant, 5/8" MDF Shallow Sub Enclosure Lined with Polyfil.

Your Price $29.99

12" Dual Hatchback Style Medium Sealed Subwoofer Enclosure

CARB Compliant, 3/4" MDF Dual Hatchback Style Sealed Enclosure w/ Premium Carpeted Finish

Your Price $71.95

12" SingleHatchback Style Small Sealed Subwoofer Enclosure

CARB Compliant, 3/4" MDF Dual Hatchback Style Sealed Enclosure w/ Premium Carpeted Finish

Your Price $42.95

12" Medium Sealed Subwoofer Enclosure

CARB Compliant, 3/4" MDF Sealed Enclosure Lined with Premium Carpeted Finish

Your Price $47.95

Single 12" Venteded MDF Subwoofer Enclosure

12" Vented 3/4" MDF Enclosure Lined w/ Polyfil.

Your Price $44.99

NVX 25 ft. of True Spec 12 Gauge Speaker Wire

100% OFC wire with EnvyFlex metallic jacket insulates and protects against damage from extreme conditions.

Your Price $39.99

25 ft. of Streetwires 12 Gauge Speaker Cable

You'll need speaker wire to hook up that new subwoofer!

Your Price $44.95

Belva 23 ft. of 12 Gauge Speaker Wire

Ultra-flexible PVC blended jacket for easy installation.

Your Price $14.99

20 Square Feet of Sound Dampening Material

NVX Sound dampening is thicker than competitors, eliminates rattles and gives you bigger bass!

Your Price $59.99

Dynamat Sound Dampening Trunk Kit

Did you know sound dampening will reduce those annoying rattles and even increase your SPL?

Your Price $94.95

Stinger Sound Dampening Trunk Kit

Stinger's Roadkill sound dampening series is sure to kill unwanted road noise and rattles! Enough sound dampening for your whole trunk!

Your Price $69.99

12 oz. Can of Adhesive Spray

Spray adhesive used for adhering carpet to subwoofer boxes without bubbles.

Your Price $6.99

Gold Plated Dual Terminal Banana Plug Connector

Enables an expandable, secure connection accepting up to 8 gauge wire.

Your Price $1.99

2" Universal, Professional Heavy Duty Roller for Sound Damping/Dampening

Universal rubber roller to make it easy to install sound dampening.

Your Price $7.99

Car Stereo and Speaker Installation Tool Kit

Includes Test Light, Crimp/Splice Tool, Multi-bit Screwdriver and more.

Your Price $16.99

Xscorpion 9-Piece Nylon Plastic Pry and Chisel Tool Set

Easily removes dash/trims, door clips, panels and pins, rubber grommets and vehicle emblems.

Your Price $14.99

Cordless Multi-Functional Heat Tool Soldering Iron Kit

Continuous working lock allows you to work without holding down trigger.

Your Price $79.99

4 Ft of 1/4" Thick Black Heat Shrink Tubing

Provides abrasion resistance and added protection for your cables.

Your Price $3.99

1mm All Purpose Solder

Solder is all purpose for use on most projects where solder is needed.

Your Price $8.99

Universal 12" Subwoofer Grille

Keep your subwoofer safe from accidental damages with this amazing grill.

Your Price $19.95

12" Protective Waffle Subwoofer Grille

Keep your subwoofer looking amazing while keeping it safe.

Your Price $4.99

Scosche SPL Meter

Monitor the noise level of your new car audio system with this SPL meter measuring from 60-135 dB.

Your Price $21.99

1 Infinity Kappa 120.9W Subwoofer

Mono Amp

2 Infinity Kappa 120.9W Subwoofers

Mono Amp

Mono Amp - Option 1

2 Channel Amp

2 Channel Amp - Bridged

3 Infinity Kappa 120.9W Subwoofers

4 Channel Amp

4 Infinity Kappa 120.9W Subwoofers

Mono Amp

2 Channel Amp

4 Channel Amp

Browse 4 questions and 18 answers
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Why did you choose this?
Sonic Electronix Store
This is a truly awesome sub, super accurate tight bass.
Frances C on Apr 29, 2015
I design custom boat audio systems, these are simply the best woofers on the market. The 10" are excellent as well. The ability to select impedance is a big plus. If you know speaker design, you will know what I am talking about. Large voice coil, heavy cone yet still one of the most efficient 10" woofers on the market.
Bill S on Mar 14, 2015
The best Subwoofer for the money. Outstanding sound with deep deep lows.
Draughon W on Apr 8, 2015
Premium sound in my truck is Infinity.. Sounds great so why not add a sub that hopefully matches the same quality sound?
Jacob B on Feb 15, 2015
Is This subwoofer 4 ohms or 2ohms? or can it do either? thanks. Also what does 4 and 2 ohm mean?
Simpson29 on Oct 16, 2014
Best Answer: Just wanted to address something stated in the top answer quickly: You do not want your subwoofer playing 400hz! Anything down to about 80-100 is the job of your main speakers. Ideally, 80hz, but I understand some people have 5 1/4" speakers, which don't produce a lot of midbass. I have this subwoofer with Inifinity Kappa 60.9cs mains and I actually have them crossed over at about 70hz. Unless you wish to have a poor sound stage, you want to limit the directional frequencies (80hz and up) played by the sub as much as possible.
Reply · Report · Geoffrey M on Oct 18, 2014
· Add Answer · I Have This Question Too (0)
how should i wire my 2 12inch infinity 120.9w kappa subwoofers with the boss cer4800w i have them hooked up now but after a while the protection mode turns on and amp cuts out but doesn't get hot?
anthony j on Dec 16, 2014
Infinity 120.9W
Infinity 120.9W
Boss CER4800D
Boss CER4800D
Best Answer: make shure your power wires to the amp are the correct size for the fuse you are using. check your power wires for a good connection . wired for a 4 ohm load won't stress your system and would be the best way to go . if your amps not making sufficient power at 4 ohm you could try wiring down to 2 ohm. Set both switches on the drivers to 4 ohms and wire them in parallel pos (+) to both pos(+) speaker terminals and neg(-) to both neg(-) speaker terminals. make shure the gain on the amp is set correct
Reply · Report · ed m on Dec 17, 2014
· Add Answer · I Have This Question Too (0)
will this fit in a .85 cubic foot sealed box?
A shopper on Feb 15, 2015
Best Answer: Hello,

The VOLUME of the enclosure does not tell us if their is adequate Depth. If said enclosure will accommodate a woofer >6-5/16", then yes. Sense you mentioned the Volume, be prepared to add a bit of PolyFil, because the woofer is optimum at ~1ft^3 . This does NOT mean the enclosure won't work, you will just need to help it out a bit.
Reply · Report · Customer SStaff on Feb 15, 2015
· Add Answer · I Have This Question Too (0)

Product Summary

Manufacturer

Model Number

120.9W

UPC

050667110451

Weight

22.00lbs

Internal SKU

1209w

Internal Product ID

20027

Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Infinity Kappa 120.9W

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