Infinity Kappa 124.7w

Features
Enclosure Compatibility
Note

Features

Selectable Impedance: For increased system flexibility, the woofer has two 4 ohm voice coils internally wired together. There is a 2 ohm/8ohm switch above the one pair of wire terminals, this provides easy configuration of the voice coils. No more confusing series and parallel connections of voice coils and easier connection for multi-subwoofer systems.

Woven Glass-Fiber Cone: This cone material is extremely stiff, minimizing cone flex; this results in very low distortion and improved clarity.

Neodymium motor with aluminum heatsink: The extruded aluminum magnet cover provides a heatsink for the motor's steel parts. The neodymium magnet provides more magnetic energy in a smaller space, which reduces overall weight, and is inherently magnetically shielded.

Vented Polepiece: Venting the polepiece reduces air compression under the dustcap which minimizes mechanical noise and provides more constant mechanical Q for reduced distortion.

Voice Coils: The 3-inch diameter voice coils with larger than typical surface area provide better thermal power handling than smaller voice coils.

Q: The medium Q design provides great performance in sealed, vented, or bandpass enclosures. Sealed enclosures for Kappa woofers can be + or - 30% of the recommended volume. Optimum vented boxes do not require super-long ports.

Terminal: The set screw wire terminal will accept bare wire up to 10 gauge.

Enclosure Compatibility

Sealed Box: Infinity recommends a sealed enclosure with an internal volume of 1.0 cu/ft, but offers an acceptable tolerance of +/- 30% (0.70 cu/ft-1.30 cu/ft). They also recommend loosely stuffing the box with poly-fill.

Ported Box: Infinity recommends a ported enclosure with an internal volume of 2.0 cu/ft with one 4" diameter x 12.26" long port. This equates to a tuning frequency of 30 Hz. They also recommend loosely stuffing the box with poly-fill, which should be glued to the walls so it doesn't clog the port.

Sealed Bandpass Box: Infinity recommends a bandpass enclosure with a sealed rear chamber volume of 1.30 cu/ft and a ported front chamber volume of 0.86 cu/ft with a 4" diameter x 9.71" long port. This equates to a tuning frequency of 50 Hz. They recommend loosely stuffing both chambers with poly-fill, glued to the walls of the ported chamber so it doesn't clog the port.

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 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 175 watts RMS.

Enclosure Note: All the volumes listed already account for the woofer's displacement.

Note

Power Handling: The woofer has two 4 ohm voice coils internally wired together. The total power handling is 350 watts RMS, 1400 watts peak. There is no provision for wiring the voice coils individually.