• Free Air Resonance (Fs): 23.5 Hz
• Electrical “Q” (Qes): 0.476
• Mechanical “Q” (Qms): 7.517
• Total Speaker “Q” (Qts): 0.448
• Equivalent Compliance (Vas): 3.68 cu ft / 104.3 L
• One-Way Linear Excursion (Xmax)*: 1.25 in / 32 mm
• Reference Efficiency (no): 0.27%
• Efficiency (1 W / 1 m)**: 86.3 dB SPL
• Effective Piston Area (Sd): 107.35 sq in / 0.0693 sq m
• DC Resistance (Re)***: 2.41 Ω
• * Xmax specifications are derived via one-way voice coil overhang method with no correction factors applied
• ** For parallel-wired voice coils, divide "Re" by 4. All other specifications remain the same
• *** Re (DC resistance) is measured with the voice coils in series, for parallel-wired specification divide Re by 4. All other specifications remain the same

Sealed Enclosure Specifications:

• Wall Thickness: 0.75 in / 19 mm
• Front Baffle Thickness: 1.0 in / 25 mm
• Volume (net int.): 2.375 cu ft / 67.3 L
• External Width (W): 25.875 in / 657 mm
• External Height (H): 16 in 406 mm
• External Depth (D): 17.25 in / 438 mm
• Internal Slot Port Width (SW): 2.25 in / 57 mm
• Internal Slot Port Height (SH): 14.5 in / 368 mm
• Internal Slot Port Length (SL): 26.25 in / 667 mm
• Port Extension Length (EL): 7.875 in / 200 mm
• Tuning Frequency (Fb): 34.6 Hz
• F3: 30.3 Hz

Ported Enclosure Specifications:

• Wall Thickness: 0.75 in / 19 mm
• Front Baffle Thickness: 1.0 in / 25 mm
• Volume (net int.): 2.375 cu ft / 67.3 L
• External Width (W): 25.875 in / 657 mm
• External Height (H): 16 in / 406 mm
• External Depth (D): 17.25 in / 438 mm
• Internal Slot Port Width (SW): 2.25 in / 57 mm
• Internal Slot Port Height (SH): 14.5 in / 368 mm
• Internal Slot Port Length (SL): 26.25 in / 667 mm
• Port Extension Length (EL): 7.875 in / 200 mm
• Tuning Frequency (Fb): 34.6 Hz
• F3: 30.3 Hz

Enclosure Notes:

• Net volumes given above do not include the air volume displaced by the speaker (Driver Displacement). This value must be added to the net volume along with the displacement of any braces and/or ports (if applicable) to arrive at a gross internal volume. Air inside a port is not part of the effective net volume. Calculate ports as solid, not hollow objects
• The W7’s employ a pole vent to remove heat and pressure from the inside of the speaker.This vent is located at the rear of the speaker. A minimum distance of 0.75 in (19 mm) is required between the back of the speaker and any wall of the enclosure to allow proper operation of the pole vent
• The dimensions given for the enclosure examples above take all applicable displacements into consideration
• Safety Notice:
• It is absolutely essential that the completed subwoofer enclosure is mounted firmly to the vehicle with heavy steel bolts (0.5 in diameter) and large steel washers on both sides of the bolts. This will reduce the likelihood of occupant injury in the event of a collision or sudden deceleration

Features:

• 13.5" subwoofer with dual 1.5-ohm voice coils
• Polypropylene W-Cone with polyester foam surround
• Solid cast-alloy basket
• Power range: 500-1,500 watts RMS
• Peak power handling: 3,000 watts
• Frequency response: 15-200 Hz
• Sensitivity: 86.3 dB
• Top-mount depth: 10-1/2"
• Sealed box volume: 1.875 cubic feet
• Ported box volume: 2.375 cubic feet
• Grille not included

What's in the Box:

• One 13.5" Dual voice coil subwoofer (attached to an MDF baffle board with 12 Phillips-head screws)
• Owner's manual
• Online product registration information