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Infinity Kappa Perfect 12.1

12" 4-ohm subwoofer

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  • Infinity Kappa Perfect 12.1

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Item# 108PER121 offer details

Item# 108PER121

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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.

Our take on the Infinity Kappa Perfect 12.1

by Guest Writer

Got enough juice? Get an amp for your new sub The Infinity Kappa Perfect 12.1 12" subwoofer joins together a rugged aluminum cone and high-roll butyl-rubber surround to produce impressive bass all the way down to 18 Hz. The ultra-rigid woofer cone won't distort (even when you push it to the max), but it's light and responsive for remarkably high sensitivity. That means it'll squeeze the most volume out of the power you feed it.

The massive cast-aluminum basket and the pole-piece are vented, so the 4-layer voice coil stays cool when the music gets hot. Infinity subjects these subs to the most intensive testing in the industry — 100 grueling hours of performance at their full RMS rating (350 watts).

The Perfect 12.1 bridges the gap between subs intended for SPL and those intended for sound quality, creating bass that hits hard and sounds great. Whether you're planning a competition system or just looking for powerful bass, this sub's ready for action.

Details:
  • 12" 4-ohm subwoofer
  • aluminum cone with high-roll butyl-rubber surround
  • massive cast-aluminum basket
  • suitable for free-air use (handles up to 175 watts in free-air applications)
  • power range: 75-350 watts RMS (1,400 watts peak power)
  • frequency response: 18-200 Hz
  • sensitivity: 96 dB
  • top mount depth: 6-1/8"
  • sealed box volume: 1.0 cu. ft.
  • ported box volume: 1.75 cu. ft.
  • Recommended Q-Logic Box Type: 1, 2, 3
  • warranty: 3 years

Priced per speaker

 

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

Features and Specs

Features and Specs
Size
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12 -inch
Impedance
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4 ohms
Cone Material
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Aluminum
Surround Material
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Butyl rubber
Ideal Sealed Box Volume (cubic feet)
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1
Ideal Ported Box Volume (cubic feet)
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1.75
Port diameter (inches)
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4
Port length (inches)
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12.33
Free-Air
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Yes
Dual Voice Coil
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No
Sensitivity
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96 dB at 2.83 watts
Frequency Response
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18 - 200 Hz
RMS Power Range (Watts)
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75-350
Peak Power Handling (Watts)
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1400
Top Mount Depth (inches)
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6 1/8
Bottom Mount Depth (inches)
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6 7/8
Cutout Diameter or Length (inches)
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10 15/16
Vas (liters)
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83.28
Fs (Hz)
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23.32
Qts
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0.44
Xmax (millimeters)
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14.15
Parts Warranty
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3 Years
Labor Warranty
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3 Years

Product Research

Product Research
What's in the box?

Download owner's manual

  • One 12" woofer
  • 1 Self-adhesive foam gasket
  • Instructions
  • Technical Data sheet
  • Warranty card
  • "Infinity" sticker

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

Features

Curvilinear Aluminum Cone: The curvilinear aluminum cone is lightweight and extremely rigid for low distortion and superior bass response.

High-roll Butyl Surround: The high-roll butyl surround damps cone resonance and ensures longevity.

Cast-Aluminum Basket: The non-resonant cast aluminum basket ensures perfect alignment of the speaker's moving parts.

Flat Uniform-roll Spider: The spider design provides maximum control over cone motion at the limits of the speaker's excursion, and reduces even-order harmonic distortion compared to cupped spiders.

Vented Pole Piece: A flared, polished and vented pole piece is used to provide optimum cooling of the voice coil and minimize turbulence.

1.5" 4-layer Voice Coil and Stacked Magnets: The 1.5" 4-layer voice coil and stacked magnets provide high motor force and room for ultra-long excursion.

Gold-plated 5-way Binding Posts: The gold-plated 5-way binding posts will accept pin connectors, spade connectors, banana plugs, dual banana plugs, and bare wire.

Enclosure Compatibility

Recommended Sealed Box Volume: Infinity recommends a sealed enclosure with an internal volume of 1.0 cu/ft.

Recommended Ported Box Volume: Infinity recommends a ported enclosure with an internal volume of 1.75 cu/ft. One 4" diameter x 12.33" long port should be used with a 1.75 cu/ft enclosure.

Recommended Sealed Bandpass Box Volume: Infinity recommends a bandpass enclosure with an internal volume of 3.45 cu/ft. The 3.4 cu/ft enclosure should have a sealed chamber volume of 2.2 cu/ft and a ported chamber volume of 1.25 cu/ft. One 4" diameter x 10.7" long port should be used in the ported chamber.

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 two areas of the vehicle. 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.

 

Product Reviews

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Reviews for the Infinity Kappa Perfect 12.1

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3 customers also rated:
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Showing: 1-20 of 50
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5 out of 5

wow!

Written By Dominic, Marysville, MI on Sunday, February 17, 2013
 
I got one of these and it slams!
Pros:
Good sound,looks nice
Cons:
None
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"Coolness Factor"
Build Quality
Ease of Use
Sound Quality
Value
 
5 out of 5

Amazing

Written By Mb8, Baton Rouge, La on Friday, August 10, 2012
 
I really think this is the best sub ever made. It can handle unbelievable amounts of power but doesn't need much. It has a remarkable build quality which allows it to sound very musical whyle still thumping in your chest. OUTSTANDING subwoofer wish they still built them to this quality!!!!!
Pros:
Is a Musical Sub Highest sensitiveity on a Subwoofer I've ever seen Can handle huge amounts of power (but doesn't need much) Built to last (I've had mine over 8 years)
Cons:
None
1 out of 1 people found this helpful
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"Coolness Factor"
Build Quality
Ease of Use
Sound Quality
Value
 
5 out of 5

Still alive and kicking since 2005

Written By Andy N, Stanton, CA on Friday, November 11, 2011
 
Everyone thinks I have 2 12's in the back of my 4Runner when I only have one. I got the DVC version and added a terminal cup to my sealed box. Hooked it up to a Stereo amp with 350 RMS. The Kappa is at 375 RMS. I bought this back in 2005 and it still sounds as rich and deep as when I it was first broken in. If set up correctly, this thing works wonders. Roll down your windows and you'll annoy your neighbors.
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"Coolness Factor"
Build Quality
Ease of Use
Sound Quality
Value
 
5 out of 5

INFINITY PERFECT 12,GREAT SPEAKER

Written By Big D, Westport,Ma. on Sunday, March 20, 2011
 
I have owned my infinity perfect 12 since 1998 yes '98' when i bought my jeep
wrangler, both my jeep and sub are still going strong,It is mated with a 600
watt bridged amp. The sub is in a sealed box sitting in back near the
tailgate,with infinity 5 1/2's in the sound bar,polk audio 4x5's in front with a
panasonic 45 watt head unit.I
have never had it full volume as the stereo volume goes up to 40, i play it around
20,(half,)as i like to keep my hearing, and the soft top looks like it's
breathing.Great and reliable product.
1 out of 2 people found this helpful
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4 out of 5

Infinity Kappa Perfect 12.1

Written By David, philip sd on Monday, February 26, 2007
Crutchfield Customer Review (What's this?)
 
these subs are the best i had two of these in a s10 regular cab with a rockford amp. these subs are some fing loud. i swear you cant blown
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5 out of 5

Best of the best

Written By JC, Rapid City, SD on Tuesday, February 13, 2007
 
I have had many systems in my 1988 Bronco II, but this is hands down the best sub I've owned. My setup right now is my 1000W Kenwood Excelon Amp with 1 12, 1 Kicker CVR Dualcoil 12, and my 2 Infinity 12s. With this setup in a custom sealed box radiates some intense bass. But the infinites are the heart of it all. Under 1000W they'll be hearing you a block away. Both quality and quanity with these. Rockford doesn't hold a candle!
1 out of 1 people found this helpful
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5 out of 5

The perfect pair of subs

Written By Mark, Plymouth, MI on Saturday, February 03, 2007
Crutchfield Customer Review (What's this?)
 
I bought two of the 12.1's for my Eclipse Spyder. I have them in a dual 1.25 ft3 sealed enclosure which takes up every last bit of trunk space. When the volume is turned up the canvas top puffs in and out to the bass and its clearly visible from outside the car. I'm powering them with an MTX 81000D which is too much power but I havent blown them yet. I have heard a wide range of subwoofers from Rockford 12's to MTX 15's and Perfects while not louder than the 15's sounded much cleaner. If you can get these 2 for 1 then they are an awsome value. Even at full price they are reasonable.
3 out of 3 people found this helpful
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5 out of 5

...and I can still hear my music

Written By nic, Jay, ME on Thursday, February 01, 2007
 
I have one of these in a basic sealed enclosure with a two channel power acoustic amp. This is my second setup, with my first being a powered bazooka tube. This is way better. I don't know how it would be in a vented enclosure and i don't care because i hate them. Sealed is the way to go. The sound quality is very good if not amazing, and the loudness is perfect in relation to the interior speakers. If you actually care about what your music sounds like, i highly suggest this sub; if your only interest is attracting attention from OUTside your car, well.... just get a second one and put them in a vented enclosure, but then the inside sounds retarded and gives you headaches. And to add to the great sound, it is clearly a high quality constructed speaker. Very nice surround, I love that high roll rubber. Buy It!
1 out of 1 people found this helpful
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5 out of 5

Perfect

Written By James, Columbus, MS on Wednesday, January 31, 2007
Crutchfield Customer Review (What's this?)
 
The name says it all. Its the best bang for the buck.
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5 out of 5

High quality, great value and low price.

Written By Tim, Jersey on Wednesday, January 31, 2007
Crutchfield Customer Review (What's this?)
 
I got two kappa perfect 12.1's powered by an alpine mrd-m1005 in a q-logic box. these subs produce wonderful sound quality and they kick pretty well. these subs represent the best value on the market when looking at quality subs.
I just can't wait to here this setup with my interiors installed with the new amp.

GET THESE!
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5 out of 5

Bang for the buck

Written By Aaron, Phoenix, AZ on Monday, January 29, 2007
 
I purchased two Infinity Kappa Perfects about a month ago and very pleased with the way they perform. When the subs hit they hit hard and clean. Ive had tests with various "bass" cd's and they've never missed a beat! Every hit was precise, and for the price you cant get a better buy.
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5 out of 5

These subs are awesome

Written By Jim, Southwick, MA on Saturday, January 20, 2007
Crutchfield Customer Review (What's this?)
 
I bought these subs a couple of months ago. I am very happy with them. They are very crisp in sound and they hit hard.
1 out of 1 people found this helpful
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5 out of 5

Great Subs For The Money

Written By Tom, Almont, MI on Sunday, January 07, 2007
 
I bought these subs. I am running them w/ an Infinity 611a amp and they hit hard. I have them in a 98 sebring lx coupe. The bass is nice and clean. I highly recommend these subs to anybody who wants hard hitting bass for under $200
1 out of 1 people found this helpful
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5 out of 5

Infinity Kappa Perfect 12.1

Written By dhicks, Smithfield, NC on Saturday, December 30, 2006
 
Picked up 2 on sale and built a 2 cu/ft box out of MSD plyboard and powered by a 920 watt kenwood and theses things BEAT. They're sitting in the backseat of a Explorer Sport Trac and they sound excellent. They bottom out a little but not enough to change the sound outside. Hit very clean and very hard. A very good buy.
1 out of 1 people found this helpful
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5 out of 5

Nice

Written By Tremain, Louisa, VA on Wednesday, December 27, 2006
 
These are some a nice subs, they sound good and hit hard. A great buy for the money.
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5 out of 5

Between Infinity and Boston Acoustics I made a good choice.

Written By apple, Tucson on Wednesday, December 27, 2006
Crutchfield Customer Review (What's this?)
 
Infinity Kappa Perfect 12.1 and the Kenwood KAC-9102D are a match made in heven. I also needed an amp that would compliment the sub and good old kenwood had th eperfect amp. These subs creat such wonderful bass, not the kind that makes ou sick, or give you a pounding head aches for hours but the kind that is rich with clarity, with smoothness that is refreshing, it make syou want to listen to it louder and louder. No matter what music I through at them the delivered, from rap, classical, newage, and vocals you name it. Just get them you will not regrete them, and turn them up when you get them.
2 out of 2 people found this helpful
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5 out of 5

Better than what I thought

Written By Matt, Pittsburgh, PA on Monday, December 18, 2006
Crutchfield Customer Review (What's this?)
 
I was looking for a system to install in my 2005 Jeep Grand Cherokee and I called crutchfield. I talked to Lucy and she told me that this sub was great and how could I complain about the price. I have it hooked up to a Audiobahn 375 watt mono amp. The subs hit great on both highs and lows. If you have a Jeep and it has a amp in it you have to run wires from the cars amp to the head unit so that it will turn on. The customer service was great. I would suggest that if you call in ask for Lucy she knew what she was talking about and got me a great system at a great price!

Thanks Crutchfield

Matt
4 out of 4 people found this helpful
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5 out of 5

These sucker hit hard

Written By George, Ceres,Ca on Sunday, December 10, 2006
Crutchfield Customer Review (What's this?)
 
These suckers hit hard. They get loud and low. I have 2 of these subs connected to a crappy Sony Xplod amp. I plan on buying another pair so I can connect the 4 subs to my Kicker KX1200.1. I cannot wait..
3 out of 4 people found this helpful
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5 out of 5

99 out of 5 Stars

Written By akord_king, Columbia Falls ,Mt on Friday, December 08, 2006
 
i bought 2 of these i build a 2.4 cu/ft sealed box 4 them also at the moment i dont have an amp to power them to there full potential im only pushing 120 rms at 2ohm into each sub AND THEY POUND i CANT BELEIVE IT i only have the amp gain at 1/5 they way up currently im breaking them in but THEY POUND louder then anything ive seen (or heard) i cant even picture how loud they are gonna be when i start pushing 300rms into these beasts I HIGHLY RECCOMEND THIS SUB OVER ANYTHING UNDER $300 THESE THINGS POUND WITH QUALITY TOO THERE ARE COMPLETELY JAW DROPPING!!!!!!
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5 out of 5

absalute BASS and CRISP sound

Written By Anonymous, Silver City, NM on Tuesday, December 05, 2006
 
I GOT TWO OF THESE SUBS ABOUT 4 MONTHS AGO AND I BARLEY PUT THEM IN MY 97 DODGE AVENGER AND ITS NOTHING BUT GREAT BIG BASS AND CRISP SOUND.I HAVE THEM ON A ROCKFORD FOSGATE 600 WATT 2 CHANNEL AMP.I USED TO HAVE 2 12INCH SUBS AND THOSE ARE NOTHING COMPARED TO THESE SUBS I (HIGHLY RECOMMEND THESE SUBS) AND YOU CANT BEAT THE PRICE, WORANTY,AND THE GREAT LOOK AND SOUND OF THESE SELF SELLING SUBWOOFERS.
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Rated 5-stars by consumers

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  • Front

    Infinity Kappa Perfect 12.1
  • Cone

    Infinity Kappa Perfect 12.1
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    Infinity Kappa Perfect 12.1