Infinity understands that the difference between good bass and great bass is in the details. Incorporating the latest low-frequency innovations, the Kappa Perfect12 VQ 12" subwoofer delivers unbeatable performance and system-tuning flexibility.

Resonance is a big time enemy of great bass, and Infinity's revolutionary Magnesium Metal Matrix (M3D) is the ultimate cone material — it's 20 times less resonant than aluminum! Housed in its die-cast frame, the M3D cone is an ultra-stiff piston that translates the low-frequency signal from your amplifier with frightening accuracy. The butylene rubber one-piece surround/gasket exerts tight control over cone excursion so you'll hear smooth bass even when you're really cranking it!

The Kappa Perfect VQ subwoofer offers the unique Variable Q feature, which allows you to optimize the speaker for use with a variety of enclosures — sealed, ported, or bandpass (even free-air applications). The sub is shipped with two metal polepiece inserts, which can be plugged into the motor assembly to vary the stiffness of the suspension:

  • large insert: small sealed or ported boxes, SPL competition
  • small insert: medium size sealed or ported boxes
  • no insert: very large enclosures or free-air use

This patent pending approach also allows you to change the character of your bass for different applications. Imagine — you could tune your subs for sound quality during the week, then retune for an SPL competition on the weekend! Leave it to Infinity to take bass to a whole new place.

  • Magnesium Metal Matrix (M3D) cone
  • large-roll butyl-rubber surround
  • Variable Q
  • massive cast-aluminum basket
  • 3" voice coil
  • suitable for free-air use (handles up to 200 watts in free-air mode)
  • recommended power range 75-400 watts RMS
  • peak power handling 1,600 watts
  • frequency response 23-400 Hz
  • sensitivity 89 dB
  • top mount depth 7"
  • sealed box volume 0.4-1.25 cu. ft.
  • ported box volume 1.75-3.00 cu. ft.
  • Recommended Q-Logic Box Type: 1, 2, 3
  • 3-year warranty

Priced per speaker

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 Perfect12 VQ Reviews

Average Customer Review:

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Great Sub.

Written By Kade, Mississippi on Sunday, July 05, 2015

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

I bought this sub in 2004 and it still looks and works like new today. Originally paired with a MTX895 (rip),this system sounded awesome. It doesn't require tremendous amounts of power, so amps run cooler longer. And just one sounds great in a slot ported 2.25cuft box tuned to about 30hz with the mid Q insert. For the past 3yrs I have had it paired with the MRX-1000. Honestly waaaas too much power for this one sub, but I don't require as much bass as I did when I originally bought this 11yrs ago. So I keep the volume moderate, which also reduces speaker flex and the voice coils heating up. It may be a hard find these days, but if you can find one of these, get it. You will not be disappointed. They are so versatile that they have also been used in custom high end homw theater setups. Bass reproduction is impeccable and phenomenal. No complaints 11yrs later.

Pros: Very wide range of uses from vehicle to home theater use. customizable box usage via Sq plugs in the back of the sub great sound reproduction no matter the music taste.

Cons: They are no longer in production. I wish I would have bought at least 3.


Written By Travis, Rapid City, SD on Saturday, May 03, 2008

I got two of these about a year ago and wouldn't trade them for anything else. They hit hard and loud and can handle anything I throw at them. I would recommend these to anyone looking for great sound.

Hard hittaz

Written By CaStylin, Houston, Tx on Sunday, March 20, 2005

Crutchfield Customer Review (What's this?)

I bought two of them thinking that one wouldnt be enough... was wrong and one was well into enogh, but I guess more is better. These things almost hit in the kicker-l7 /jl audio-w7 range but dont require the great amounts of power. Ive got them hooked up to indivual amps and streetwire caps on a streetwire 1/0 gauge (maybe unnessary) set up. the varable Q is great to cuz it allows u to get the sound u want in the different types of set ups. 5 stars all the way and while your at it by some dyno mat extreme top get rid of all that raddling these cause.


Infinity Kappa Perfect12 VQ

Written By brucelee829, College Station, TX on Wednesday, March 16, 2005

Great sounding subs. I put mine in a sealed Q logic box and they sounds great. Really hits low and rattles everything, crisp clean sounding. Just make sure that you have the right amp to go with the application in order to get the full effect of these infinities. Not power hogs by any means. If your looking for a good low hitting sub with great quality...infinity is perfect.

Infinity all the way

Written By steve, Pittsburgh, PA on Friday, February 18, 2005

The kappa PERFECT literally the perfect subwoofer. i only have one installed in my car which is more than you need. its even louder than a pair of infinity 1030's which my friend has. my sub is amplified with the infinity 610A which seems to be the perfect combo. the subwoofer itself is as loud as a Type X without being such a power hog. in fact i would recommend getting the amp. remote to be able to tone down the bass for some songs. the amplifier is one of the best for not drowning out the power and causing the lights to flicker on the peaks. i would highly recommend the kappa perfect if your looking for quality sound and loud bass.

Very under rated sub

Written By Andy, Uxbridge, Mass on Tuesday, February 08, 2005

This is one of the best subs out there but nobody knows it. I don't think it compares to kickers L7's, but it can hold it's own. Infinity does make some of the best speakers out there and this sub is just awsome. One, it isn't a power hungry beast , so you don't need multiple amps 2 power a pair of these. Second, the variable Q is an awsome and useful thing. One thing tho, from my experience and my freinds who have them, there super good at low bass, deep low bass. Nothing above like 100 Hz is good. it will sound good, but just average. If your lookin 4 low, tight, loud bass this is what u want. A lil expensive, but what can ya do...

Hands-on research

What's in the box?

Download owner's manual

  • One 12" woofer
  • 1 "LoQ" metal polepiece insert (large)
  • 1 "MidQ" metal polepiece insert (small)
  • 1 Self-adhesive foam gasket
  • 1 Insert tool
  • Instructions
  • Warranty card
  • One 8" x 2-1/2" Infinity sticker

Product Research

Enclosure Compatibility


Magnesium Metal Matrix (M3D) Woofer Cone: Magnesium Metal Matrix (M3D) is 20 times less resonant than aluminum, delivering superior stiffness and damping.

Nitrile-butylene-rubber One-piece Surround and Gasket: This material provides an optimum blend of elasticity and internal damping. The large roll offers good long-throw linearity with the proper amount of control and stability at excursion limits.

Proprietary Die-cast Frame: The frame offers ample rigidity to support the motor structure, and its vented architecture provides greater movement of air behind the cone and spider for maximum cooling.

Spider-integrated Tinsel Leads: The spider-integrated tinsel leads enhance reliability and eliminate audible tinsel lead slap.

Variable Q: The Kappa Perfect VQ subwoofer offers the unique Variable Q feature, which allows you to optimize the speaker for use with a variety of enclosures - sealed, ported, or bandpass (even free-air applications). The sub is shipped with two metal polepiece inserts, which can be plugged into the motor assembly to vary the stiffness of the suspension:

  • Large "LoQ" Insert: small sealed or ported boxes, SPL competition
  • Small "MidQ" Insert: medium size sealed or ported boxes
  • No Insert: very large enclosures or free-air use

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: The sealed box sizes recommended by Infinity range from 0.4 cu/ft to 1.25 cu/ft.

Recommended Ported Box Volume: The ported box sizes recommended by Infinity range from 1.75 cu/ft to 3.0 cu/ft. One 4" diameter x 14.5" long port should be used with the 1.75 cu/ft enclosure and one 4" diameter x 16" long port should be used with the 3.0 cu/ft enclosure.

Recommended Sealed Bandpass Box Volume: The bandpass box sizes recommended by Infinity range from 2.0 cu/ft to 3.2 cu/ft. The 2.0 cu/ft enclosure has a sealed chamber volume of 1.0 cu/ft and a vented chamber volume of 1.0 cu/ft. The 3.2 cu/ft enclosure has a sealed chamber volume of 2.0 cu/ft and a vented chamber volume of 1.2 cu/ft. One 4" diameter x 10.5" long port should be used with the 2.0 cu/ft enclosure and one 4" diameter x 6.8" long port should be used with the 3.2 cu/ft enclosure.

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.

Note: When used as a free-air subwoofer, no metal polepiece insert is required.


Thiele/Small Parameters: The following Thiele/Small parameters change depending on which metal polepiece insert is used:

  • BL:
    • Large "LoQ" Insert: 15.55 Tesla meters
    • Small "MidQ" Insert: 12.19 Tesla meters
    • No Insert: 9.67 Tesla meters
  • Qes:
    • Large "LoQ" Insert: 0.36
    • Small "MidQ" Insert: 0.5
    • No Insert: 0.79
  • Qts:
    • Large "LoQ" Insert: 0.34
    • Small "MidQ" Insert: 0.47
    • No Insert: 0.74

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 verify what’s in the box, 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.