JL Audio W7 - Manual (Page 7)

Grille clearance: 2.7 in. (69 mm) from the bottom of the mounting
flange to the lowest inside surface of the grille.
Displacement: 0.21 cu. ft. (5.9 ltrs)
Net Weight: 52 lbs. (23.6 kg)
Mounting Hardware: Twelve #12 x 1.75" long clear, zinc-plated steel
Phillips pan-head sheet metal screws (included) or twelve #12-28 long
steel Phillips pan-head machine screws with #12-28 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: 2.375 cu. ft. (67.3 ltrs.)
Recommended Port Tuning: 30 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: 1.875 cu. ft. (53.1 ltrs.)
fc: 40.8 Hz f3: 36.3 Hz Qtc: 0.806
front Baffle Thickness: 1 in. (25 mm)
Wall Thickness: 0.75 in. (19 mm)
Driver Specifications
Enclosure Specifications
Overall
Diameter
14 in.
(356 mm)
Bolt Hole
Circle
12.7 in.
(323 mm)
12 Holes
Magnet
Diameter
8.38 in.
(213 mm)
Mounting
Hole
Diameter
11.9 in.
(302 mm)
Overall
Depth
12 in.
(305 mm)
Mounting
Depth
10.5 in.
(267 mm)
External Width
17.0 in.
(432mm)
External Height
17.25 in.
(438 mm)
External Depth
16.5 in.
(419 mm)
External Width
25.125 in.
(638 mm)
External Height
17.25 in.
(438 mm)
External Depth
16.5 in.
(419 mm)
Slot Height
15.75 in.
(400 mm)
Extension Length
7.875 in.
(200 mm)
Slot Width
2.0 in.
(51 mm)
Slot Width
2.0 in.
(51 mm)
Slot Length
25.375 in.
(645 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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