JL Audio W7 - Manual (Page 9)

Grille clearance: 2.6 in. (66 mm) from the bottom of the mounting
flange to the lowest inside surface of the grille.
Displacement: 0.14 cu. ft. (4.0 ltrs)
Net Weight: 45 lbs. (20.4 kg)
Mounting Hardware: Twelve #10 x 1.75" long clear, zinc-plated steel
Phillips pan-head sheet metal screws (included) or twelve #10-32 long
steel Phillips pan-head machine screws with #10-32 T-Nuts, each at least
1/2-inch (12.5 mm) longer than the thickness of the mounting baffle
(not included).
Unpacking/Mounting: Please refer to the “How to: Mount a W7
Subwoofer ” on pages 4 & 5 for detailed, step-by-step instructions.
PORTED ENcLOSURE:
Recommended Net Volume: 1.75 cu. ft. (51.54 ltrs.)
Recommended Port Tuning: 32 Hz
Port Type: “Slot” ports are recommended. See information above.
The port recommendations listed above are derived through actual
tests and measurements (not computer simulations).
front Baffle Thickness: 1 in. (25 mm)
Wall Thickness: 0.75 in. (19 mm)
Net volumes given below 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 dimensions given for the enclosure examples below take all applicable
displacements into consideration.
SEALED ENcLOSURE:
Recommended Net Volume: 1.375 cu. ft. (38.94 ltrs.)
fc: 44.7 Hz f3: 40.4 Hz Qtc: 0.792
front Baffle Thickness: 1 in. (25 mm)
Wall Thickness: 0.75 in. (19 mm)
Driver Specifications
Enclosure Specifications
Overall
Depth
11.25 in.
(286 mm)
Mounting
Depth
9.5 in.
(241 mm)
Overall
Diameter
12.5 in.
(318 mm)
Bolt Hole
Circle
11.27 in.
(286 mm)
12 Holes
Magnet
Diameter
7.5 in.
(191 mm)
Mounting
Hole
Diameter
10.5 in.
(267 mm)
External Width
15.5 in.
(394 mm)
External Height
15.5 in.
(394 mm)
External Depth
15 in.
(381 mm)
Slot Height
14.0 in.
(356 mm)
External Width
22.5 in.
(572 mm)
External Height
15.5 in.
(394 mm)
External Depth
15.5 in.
(394 mm)
Slot Width
1.75 in.
(44 mm)
Slot Length
24.0 in.
(610 mm)
Slot Width
1.75 in.
(44 mm)
Extension Length
7.625 in.
(194 mm)
SAfETY NOTIcE!
It is absolutely essential that the completed subwoofer enclosure is mounted
firmly to the vehicle with heavy steel bolts (1/2 inch 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.
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