Selectable Impedance: For increased system flexibility, the
woofer impedance is switchable. There is a 2 ohm/4ohm switch above the wire
terminals, this provides easy configuration of the voice coil. The power handling
is the same for either setting; 350 watts RMS/1400 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 set screw wire terminals will accept bare wire
up to 8 gauge.
Sealed Box: Infinity recommends a sealed enclosure with an
internal volume of 0.75 cu/ft.
Ported Box: Infinity recommends a ported enclosure with an
internal volume of 1.5 cu/ft with one 3" diameter x 10.25" long port.
This equates to a tuning frequency of 30 Hz. They also recommend using a sub-sonic
Sealed Bandpass Box: When using a bandpass enclosure Infinity
recommends a sealed rear chamber volume of 0.75 cu/ft and a ported front chamber
volume of 0.75 cu/ft with a 4" diameter x 7.5" long port. This equates
to a tuning frequency of 60 Hz. They also recommend using a sub-sonic filter.
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.
Thiele-Small Parameters: Because the woofer has two impedance
settings, there are two sets of Thiele-Small parameters:
| ||2Ω ||4Ω |
|DC Resistance (Ω) ||2.0 ||4.2 |
|Inductance (mH) ||1.17 ||1.17 |
|Vas (liters) ||18.05 ||18.05 |
|Qms ||4.18 ||2.43 |
|Qes ||0.51 ||.53 |
|Qts ||0.46 ||.44 |
|Fs (Hz) ||33.8 ||33.8 |
|Radiating Area (m²) ||0.033 ||0.033 |
|Xmax (mm) ||17.5 ||17.5 |
|Motor Force Factor (TM) ||12.47 ||17.72 |
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