JL Audio W7 - Manual (Page 11)

Grille clearance: 2.25 in. (57 mm) from the bottom of the mounting
flange to the lowest inside surface of the grille.
Displacement: 0.09 cu. ft. (2.5 ltrs)
Net Weight: 30 lbs. (15.8 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: 1.5 cu. ft. (42.5 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: 1.25 cu. ft. (35.4 ltrs.)
fc: 44.7 Hz f3: 40.7 Hz Qtc: 0.785
front Baffle Thickness: 1 in. (25 mm)
Wall Thickness: 0.75 in. (19 mm)
Driver Specifications
Enclosure Specifications
Overall
Depth
9.63 in.
(245 mm)
Mounting
Depth
8 in.
(203 mm)
Overall
Diameter
10.5 in.
(267 mm)
Bolt Hole
Circle
9.34 in.
(237 mm)
12 Holes
Magnet
Diameter
6.55 in.
(166 mm)
Mounting
Hole
Diameter
8.74 in.
(222 mm)
External Width
15.5 in.
(394 mm)
External Height
14 in.
(356 mm)
External Depth
15 in.
(381 mm)
External Width
23.375 in.
(594 mm)
External Height
13.5 in.
(343 mm)
Slot Height
12.0 in.
(305 mm)
External Depth
14.5 in.
(368 mm)
Extension Length
7.25 in.
(184 mm)
Slot Width
1.5 in.
(38 mm)
Slot Length
22.5 in.
(572 mm)
Slot Width
1.5 in.
(38 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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