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Infinity Kappa 1200W

Kappa Series 12" subwoofer with selectable 2- or 4-ohm impedance

Item # 108KAPPA12

With their rugged construction and sophisticated engineering, Infinity's Kappa subwoofers excel in a variety of...

Read more from Crutchfield writer, Bob B.

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About the Infinity Kappa 1200W

All-around excellence

With their rugged construction and sophisticated engineering, Infinity's Kappa subwoofers excel in a variety of applications, equally at home in ported or sealed enclosures. These dependable subs feature switchable impedance so they'll always fit into your system, and they'll handle plenty of power so they'll deliver powerful, accurate bass. Plus, Infinity protects these subs with an impressive 3-year warranty.

All-around excellence

With their rugged construction and sophisticated engineering, Infinity's Kappa subwoofers excel in a variety of applications, equally at home in ported or sealed enclosures. These dependable subs feature switchable impedance so they'll always fit into your system, and they'll handle plenty of power so they'll deliver powerful, accurate bass. Plus, Infinity protects these subs with an impressive 3-year warranty.

Selectable impedance

Infinity's Kappa 1200W 12" subwoofer features the 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.

Rugged construction

This sub handles plenty of power and sounds great in sealed or ported enclosures. Infinity's proprietary aero-cooling design helps keep the 2" voice coil cool. The acoustically damped glass-fiber cone minimizes distortion, giving you nothing but pure bass. And the steel basket provides a solid base for the sub, which handles up to 500 watts RMS. Infinity's Kappa subwoofers are known for their sound quality, and they offer the wiring versatility you need to build a system for your changing needs.

To drive this single subwoofer, we recommend a mono amplifier rated between 375 and 750 watts RMS at 2 ohms. For more information, please refer to our article on How to Match Subwoofers and Amplifiers.

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Product highlights:

  • 12" subwoofer with selectable 2- or 4-ohm impedance
  • coated glass-fiber cone with rubber surround
  • steel basket
  • frequency response: 23-400 Hz
  • power rating: 500 watts RMS (2,000 watts peak power)
  • sensitivity: 91 dB
  • top-mount depth: 7-1/16"
  • sealed box volume: 0.9 cu. ft.
  • ported box volume: 2.5 cu. ft.
  • grille not included
  • warranty: 3 years
  • Our 60-day money-back guarantee
  • MFR # Kappa 1200W
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What's in the box:

  • One 12" Woofer
  • Screw cover ring (installed)
  • Self-adhesive foam gasket
  • Owner's manual (English/ French/ Spanish/ fifteen other languages)

Customer reviews

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Infinity Kappa 1200W Reviews

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Product Research

Features
Enclosure Compatibility
Specifications

Features

Selectable Smart Impedance (SSI): A switch on the input terminal allows you to easily change the woofer's impedance between 2Ω and 4Ω settings. (The connected amplifier should be off when changing the impedance.) The power handling is the same for either setting; 500 watts RMS/2000 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 spring terminals will accept bare wire up to 10 gauge.

Enclosure Compatibility

Sealed Box: Infinity recommends a sealed enclosure with an internal volume of 0.9 ft³.

Ported Box: Infinity recommends a ported enclosure with an internal volume of 2.5 ft³ with one 4" diameter x 10" long port, resulting in a tuning frequency of 30 Hz. They also recommend using a sub-sonic filter.

Free-air Mounting: In addition to being compatible with sealed and ported 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 250 watts RMS.

Specifications

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

 
DC Resistance (Ω) 1.948 3.858
Inductance (mH) 1.10 0.85
Vas (liters) 64.47 64.47
Qms 4.0 4.0
Qes 0.567 0.566
Qts 0.496 0.496
Fs (Hz) 26.5 26.5
Radiating Area (m²) 0.05309 0.05309
Xmax (mm) 13 13
Motor Force Factor (TM) 11.32 15.74

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
Sound quality and low and high frequency range. [ M  Nov 12, 2018 ]
A
Subwoofer blew [ Henry J.  Sep 12, 2018 ]
A
i love infinity [ Larry  Feb 03, 2018 ]
A
Lyndsey and Shane (tech support) helped me pick it. Great reps for Crutchfield!!! [ TIMOTHY C  Nov 09, 2017 ]
A
Big amp [ JOHNNY JC  Oct 11, 2017 ]
A
the reputation infinity has. [ R SCOTT  Jul 27, 2017 ]
A
good price and reviews [ richard  May 13, 2017 ]
A
Has the frequency range I'm looking for. Goes great with my amp. [ Rudy  Mar 17, 2017 ]
A
because i think they will sound amazing [ Laura  Nov 28, 2016 ]
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4 questions already asked

Q
What's the deal with the two different color schemes? One looks gold, one looks silver, is this an option?
[ Jay Dee  Dec 11, 2018 ]
4 answers
A
Its the lightning. They have an odd color to them it looks nice but under differnt light or angles the appear different
[ Jared  Dec 16, 2018 ]
A
For what it's worth, I ordered 2 of these and both came in silver. I don't see any spec differences so I could just be picture lighting or a change in product color.
[ Samuel Smith  Dec 11, 2018 ]
A
I didn't get a color option , I guess its just how it looks in pictures but they are quality subs . hope this helps
[ CORY  Dec 11, 2018 ]
A
I think it is. I ordered a pair and they were silver. Awesome speakers
[ QUAVEION  Dec 11, 2018 ]
Q
I have an alpine mrv-m500 amp at the moment and I'm looking to upgrade my sub. Would this be a good suit? My amp gives 500 watts rms at 2 ohms
[ john  Sep 09, 2017 ]
1 answer
A
Thanks for your question. For information on selecting the best sub for your amp 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 between the models and help you make the best choice for your system.
[ Krissy  Sep 11, 2017 ]  Staff
Q
What upgrades or differences between this sub and the 120.9 it replaced?t/s specs
[ chad  Sep 08, 2017 ]
1 answer
A
Thanks for your question. For information on comparing two or more models 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 and your budget.
[ Kenny  Sep 08, 2017 ]  Staff
Q
I have one of these subs coming in the mail. I currently have a power acoustik rz1-1500d that "allegedly" puts out 600w at 4ohms. Would this amp be OK powering this sub? Should I upgrade amps as well? Would an amp that's truly rated at 700w rms fry this speaker?
[ Justin  Aug 20, 2017 ]
2 answers
A
I run atrue bench tested 1170 to a pair. They sound great. I belive they could handle 1k each. The beauty of these subs is the ability towire themin any configuration. To match the amp or number of subs
[ Jared  Dec 16, 2018 ]
A
No I believe that it will easily handle1000 watts ,hope this helps. Cory
[ CORY  Aug 21, 2017 ]

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