JL Audio Subwoofe dimensions Physical Dimensions, Normal Recommended Enclosures single driver

Subwoofer Specifications

		8W1-4			8W1-8
Fs (free-air resonance):		33.2 Hz			35.7 Hz
Qts (total speaker “Q”):		0.345			0.385
Qes (electrical “Q”):		0.355			0.414
Qms (mechanical “Q”):		11.5			6.247
Vas (equivalent compliance):	0.90	ft3	25.5 liters	0.78	ft3		22.1 liters
Xmax (linear excursion one-way):	0.282 in.		7.2 mm	0.282	in.		7.2 mm
Efficiency (1W/1m)*:		86.0 dB			85.6 dB
Sd (effective piston surface area):	30.7	in2	0.0198m2	30.7	in2	0.0198m2
Re (DC resistance):		3.34 Ω			6.89 Ω
Znom (nominal impedance):		4 Ω			8 Ω
Pt (continuous thermal power handling):		100Watts			100 Watts

*Efficiency (1W/1m) is not an accurate indicator of a subwoofer’s output capability and should not be used as a comparison to other subwoofers to determine which one is “louder”!

Physical Dimensions

Frame Diameter (A):	8.25	in.	209.55	mm
Mounting Hole Diameter (B):	7	in.	177.8	mm
Mounting Depth (C):	3.75	in.	95.25	mm	A
Overall Depth (D):	4.25	in.	107.95	mm
Magnet Diameter (E):	4.5625	in.	115.88	mm
Displacement:	0.025	ft3	0.707	liters

Be sure to allow 0.75 inches (19mm) for pole vent clearance on this driver.

D

E B

C

Normal Recommended Enclosures (single driver)

Model			8W1-4		8W1-8
		Volume (Net Int.)	width X height X depth	Volume (Net Int.)	width X height X depth
Sealed		0.30 ft3	16” x 9” x 6.75”	0.30 ft3	16” x 9” x 6.75”
Enclosure		8.5 l	406mm x 229mm x 171mm	8.5 l	406mm x 229mm x 171mm
Ported		0.75 ft3	15” x 9” x 15.5”	0.75 ft3	15” x 9” x 15.5”
Enclosure		21.2 l	381mm x 229mm x 394mm	21.2 l	381mm x 229mm x 394mm
	Port		2.5” X 12.4”		2.5” X 11.7”
(inside dia. X length)			64mm X 318mm		64mm X 297mm

H

H

W	D	W	D
Sealed Enclosure		Ported Enclosure

•Enclosure dimensions listed are external dimensions which assume the use of 0.75 inch (19mm) thick material. If you are using 0.625 inch (16mm) thick material, subtract 0.25 inches (6.5mm) from each dimension. Do not use material with a thickness of less than 0.625 inches (16mm).

•Enclosure volumes listed are NET internal volumes. Driver displacement, port displacement and brace displacement must be added to obtain the final gross volume. The dimensions listed have already taken this into account.

•When using two subwoofers in a common enclosure simply double the required volumes and use two of the recommended ports (when needed). Likewise, when using three subwoofers in a common enclosure simply triple the required volume and number of ports (when needed).