About the Infinity Kappa 123WDSSI
All-around excellence
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 123WDSSI 12" subwoofer features the unique Selectable Smart Impedance design, which lets you build exactly the system you want 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.
Product highlights:
- Featured in our article: Best 12" car subwoofers for 2023
- 12" subwoofer with selectable 2- or 4-ohm impedance
- coated glass-fiber cone with rubber surround
- steel basket
- terminals accept up to 8-gauge speaker wire
- frequency response: 25-175 Hz
- power handling: 500 watts RMS (1500 watts peak power)
- sensitivity: 92 dB
- top-mount depth: 7.008"
- cutout diameter: 11.195"
- sealed box volume: 1.3 cu. ft.
- ported box volume: 2.5 cu. ft.
- grille not included
- warranty: 3 years
- Our 60-day money-back guarantee
- MFR # INFSUBKA123WDSSIAM
What's in the box:
Infinity Kappa 123WDSSI owner's manual
- One 12" Subwoofer
- Screw cover trim ring
- Adhesive-backed foam gasket
- Eight 1" Screws
- Owner's manual (English/ French/ Spanish/ fifteen other languages)
- Template
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More details on the Infinity Kappa 123WDSSI
Features & specs
| Size | 12 -inch | |
| Impedance (Ohms) | 2, 4 | |
| Cone Material | Glass Fiber over Paper | |
| Surround Material | Rubber | |
| Ideal Sealed Box Volume (cubic feet) | 1.3 | |
| Ideal Ported Box Volume (cubic feet) | 2.5 | |
| Port diameter (inches) | 4 | |
| Port length (inches) | 10 | |
| Free-Air | Yes | |
| Dual Voice Coil | No | |
| Sensitivity |
92 dB at 2.83 volts | |
| Frequency Response | 25 - 175 Hz | |
| Max RMS Power Handling | 500 | |
| Peak Power Handling (Watts) | 1500 | |
| Top Mount Depth (inches) | 7 1/16 | |
| Bottom Mount Depth (inches) | 7 3/8 | |
| Cutout Diameter or Length (inches) | 11 1/4 | |
| Vas (liters) | 58.7 | |
| Fs (Hz) | 34.2 | |
| Qts | 0.778 | |
| Xmax (millimeters) | 10.25 | |
| Parts Warranty | 3 Years | |
| Labor Warranty | 3 Years | |
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/1500 watts peak.
Cone: The cone material is a composite of glass fiber over a paper pulp material. Adding the glass fiber layer increases cone rigidity to improve bass accuracy, while the pulp base improves the sub's damping characteristics.
Terminal: Although the spring terminals will accept bare wire up to 8-gauge, the angle makes inserting an 8-gauge wire very difficult. As a practical matter I consider these 10-gauge terminals.
Enclosure Compatibility
Sealed Box: Infinity recommends a sealed enclosure with an internal volume of 1.3 ft³. Sealed enclosures provide the most control over a woofer and provide accurate sonic reproduction, making them suitable to all types of music.
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 35 Hz. They also recommend using a sub-sonic filter. Ported enclosures typically provide better overall efficiency than sealed so they are suitable for use with smaller amplifiers, giving you more bass output from a given amount of power.
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:
| 2Ω | 4Ω | |
| DC Resistance (Ω) | 2.33 | 4.49 |
| Inductance (mH) | 1.403 | 1.265 |
| Vas (liters) | 58.7 | 45.1 |
| Qms | 6.134 | 3.546 |
| Qes | 0.891 | 0.875 |
| Qts | 0.778 | 0.702 |
| Fs (Hz) | 34.2 | 34.2 |
| Radiating Area (cm²) | 551.55 | 551.55 |
| Xmax (mm) | 10.25 | 10.25 |
| Motor Force Factor (TM) | 9.44 | 15.1 |
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Customer Q&A
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I have the JBL Stadium's which is the same exact sub. They pound, but so clear and clean you will pick up nuances that you never heard on tracks you've listened to hundreds of times. I also have the old Infinity Kappa Perfect 12's that are 20 years old and still sound like new. Great speakers!
Brian from Greenville SC