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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.
