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Infinity Kappa 103WDSSI Kappa Series 10" subwoofer with selectable 2- or 4-ohm impedance

Item # 108K103WDS

Infinity's Kappa 103WDSSI 10" subwoofer features the unique Selectable Smart Impedance design, which lets you build...

Infinity's Kappa 103WDSSI 10" subwoofer features the unique Selectable Smart Impedance design, which lets you build...

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2 questions - 2 answers

Item # 108K103WDS

In stock
$289.95 each

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About the Infinity Kappa 103WDSSI

Bob Bihlmayer

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 103WDSSI 10" 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 450 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.

Subwoofer Wiring Diagrams

To see sample wiring diagrams for all common subwoofer/amplifier combinations, check out this informative article.

READ LESS

Product highlights:

  • 10" 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: 30-175 Hz
  • power handling: 450 watts RMS (1350 watts peak power)
  • sensitivity: 91 dB
  • top-mount depth: 6-1/4"
  • cutout diameter: 9"
  • grille not included
  • warranty: 3 years
  • MFR # INFSUBKA103WDSSIAM

What's in the box:

  • One 10" 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 103WDSSI

Pat M.

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; 450 watts RMS/1350 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: The spring terminals will accept bare wire up to 8 gauge.

Enclosure Compatibility

Sealed Box: Infinity recommends a sealed enclosure with an internal volume of 0.8 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 1.5 ft³ with one 3" diameter x 6" long port, resulting in a tuning frequency of 43 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 225 watts RMS.

Specifications

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

 
DC Resistance (Ω) 2.19 4.55
Inductance (mH) 1.49 1.338
Vas (liters) 12.17 11.8
Qms 5.138 3.295
Qes 0.797 0.89
Qts 0.69 0.701
Fs (Hz) 45.4 45.2
Radiating Area (cm²) 330.06 330.06
Xmax (mm) 10.25 10.25
Motor Force Factor (TM) 11.05 15.31

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Customer Q&A

2 questions already asked

Q
What is the diameter of the magnet? The depth is great to work with the GTI box but depends on size of magnet
dietzkev  Jun 19, 2022
1 answer
A
This is a pretty beefy magnet on the Kappa 103WDSSI, part of the reason why this speaker performs so well! We have Infinity listing the diameter of the magnet at 6.08 inches.
bo  Jun 20, 2022 (Staff)
Q
Is this a true free air subwoofer? Looking to mount a subwoofer in my rear deck
joshua  Nov 06, 2021
1 answer
A
It sure is designed to work in a free air, also known as infinite baffle setup! The manual also states that you should only use half the watt power ratings when installing it this way so the watts RMS becomes 225
jason  Nov 08, 2021 (Staff)

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