JL Audio 15W3 18W3 owner manual Subwoofer Specifications, Wiring Options

SUBWOOFER SPECIFICATIONS

SUBWOOFER:	15W3-D2	15W3-D4	18W3-D2	18W3-D4
Free Air Resonance (Fs):	21.3 Hz	21.8 Hz	19.0 Hz	19.7 Hz
Electrical “Q” (Qes):	0.4559	0.4302	0.4079	0.456
Mechanical “Q” (Qms):	8.854	8.854	8.7578	8.0183
Total Speaker “Q” (Qts):	0.434	0.41	0.39	0.432
Equiv. Compliance (Vas):	8.42 ft3	8.42 ft3	13.339 ft3	13.339 ft3
	238.5 litres	238.5 litres	377.1 litres	377.1 litres
One-way, Linear Excursion:	0.675 in	0.675 in	0.500 in	0.500 in
(Xmax)*	17.1 mm	17.1 mm	12.7 mm	12.7 mm
Efficiency (1W/1m)**:	88.8 dB	89.4 dB	89.8 dB	89.8 dB
Effective Piston Area (Sd):	127.5 in2	127.5 in2	186.1 in2	186.1 in2
	0.0823 m2	0.0823 m2	0.12009 m2	0.12009 m2
DC Resistance (Re)***:	3.34Ω	6.66Ω	3.36Ω	6.54Ω
Nominal Impedance:	Dual 2Ω	Dual 4Ω	Dual 2Ω	Dual 4Ω
Power Handling (continuous):	400W	400W	500W	500W
Mounting Depth:	8.125 in	8.125 in	9.0625 in	9.0625 in
	206 mm	206 mm	230 mm	230 mm
Mounting Hole Diameter:	13.875 in	13.875 in	16.5 in	16.5 in
	352 mm	352 mm	419 mm	419 mm
Driver Displacement:	0.140 ft3	0.140 ft3	0.20 ft3	0.20 ft3
	3.9 litres	3.9 litres	5.6 litres	5.6 litres

*Xmax specifications are derived via one-way voice coil overhang method with no correction factors applied. **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”. ***Re (DC resistance) is measured with the voice coils in series, for parallel-wired specification divide Re by 4. All other specifications remain the same.

WIRING OPTIONS

W 3 VO I C E C O I L S I N S E R I E S : W 3 VO I C E C O I L S I N PA R A L L E L :

	W3-D4: 8.0Ω	AMPLIFIER	W3-D4: 2.0Ω
AMPLIFIER			W3-D2: 1.0Ω
	W3-D2: 4.0Ω

W3-D4: 4.0Ω

AMPLIFIERΩ

W3-D2: 2.0

W3-D4: 1.0Ω

AMPLIFIERΩ

W3-D2: 0.5

W3-D4: 2.7Ω

AMPLIFIERΩ

W3-D2: 1.3

W3-D4: 0.7Ω

AMPLIFIERΩ

W3-D2: 0.3

2 JL AUDIO 15W3/18W3