JL Audio 15W3 18W3 Recommended Enclosures, Subwoofer Sealed Enclosure Ported Enclosure, U T I O N

RECOMMENDED ENCLOSURES

SUBWOOFER	SEALED ENCLOSURE		PORTED ENCLOSURE
Volume	External Dimensions	Volume	External Dimensions	Port(s)
(net int.)	(Width x Height x Depth)	(net int.)	(Width x Height x Depth)	(Inside Dia. x Length)
2.125 ft3	22" x 16" x 14.75"	3.50 ft3	24" x 19" x 18"	(2) 3.0" x 11.6"
15W3-D2	559mm x 406mm x 375mm	99.1 litres	610mm x 483mm x 457mm	(2) 76mm x 295mm
60.2 litres
2.125 ft3	22" x 16" x 14.75"	3.50 ft3	24" x 19" x 18"	(2) 3.0" x 10.9"
15W3-D4	559mm x 406mm x 375mm	99.1 litres	610mm x 483mm x 457mm	(2) 76mm x 277mm
60.2 litres
3.00 ft3	24" x 19" x 15.5"	4.00 ft3	26" x 22" x 16.25"	(2) 3.0" x 10.1"
18W3-D2	610mm x 483mm x 394mm	113.3 litres	660mm x 559mm x 413mm	(2) 76mm x 257mm
85 litres
3.25 ft3	24" x 19" x 16.75"	4.50 ft3	26" x 22" x 18"	(2) 3.0" x 8.6"
18W3-D4	610mm x 483mm x 425mm	127.4 litres	660mm x 559mm x 457mm	(2) 76mm x 218mm
92 litres

C A U T I O N

Prolonged exposure to sound pressure levels in excess of 100dB can cause permanent hearing loss. This high-performance speaker can exceed this level. Please exercise restraint in its operation in order to preserve your ability to enjoy its fidelity.

When installing a subwoofer in your vehicle, it is extremely important to secure the enclosure firmly. We recommend bolting the enclosure through the metal of the floorpan or the frame of the vehicle with large diameter washers for reinforcement. If an enclosure is not firmly attached, it can become a projectile in a collision. This is particularly important in a hatchback, station wagon, sports utility vehicle, or van.

•The enclosure recommendations listed above are external dimensions which assume the use of 3/4" (19mm) thick material. If you are using 5/8" (16mm) thick material, subtract 1/4" (6.5mm) from each dimension. Do not use any material with a thickness of less than 5/8" (16mm) as this may compromise the rigidity of the enclosure.

•All enclosure volumes listed above are net internal volumes! Driver displacement, port

displacement and brace displacement must be added to obtain the final gross internal volume. All enclosure dimensions above have already taken this into acount.

•When using two subwoofers in a common enclosure simply double the required volume and, in the case of a ported enclosure, use two times the recommended port(s). Likewise, when using three subwoofers in a common enclosure simply

triple the required volume and, in the case of a ported enclosure, use three times the recommended port(s).

•We recommend the use of this speaker in a bi-amplified system using high-quality satellite speakers and a high-quality amplifier. We do not recommend the use of this subwoofer with a passive crossover (coil), as this type of device will adversely affect performance.

All specifications are subject to change without notice.

JL AUDIO 15W3/18W3 3