8W7
DRIVER SPECIFICATIONS
8W7-3
Free
Air Resonance (Fs):
35.2 Hz
Electrical “Q” (Qes):
0.654
Mechanical “Q” (Qms):
9.50
Total Speaker “Q”
(Qts):
0.612
Equivalent Compliance
(Vas):
0.61 cu. ft. / 17.4 liters
One-Way, Linear
Excursion (Xmax)*:
0.75 in. / 19 mm
Reference Efficiency
(no):
0.112%
Efficiency (1W/1m)**:
82.7 dB SPL
Effective Piston Area
(Sd):
38 sq. in. / 0.0245 sq. m.
DC Resistance (Re):
2.78
Nominal Impedance
(Znom):
3 ohm
Thermal Power Handling
(Pt):
500W
Driver Displacement:
0.06 cu. ft. / 1.7 liters
Net Weight:
17 lbs. / 7.8 kg
* 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".
Click here to download the owner's manual (PDF).
8W7 DRIVER
PHYSICAL SPECIFICATIONS
Nominal
Diameter
Overall
Diameter (A)
Mounting Hole
Diameter (B)
Bolt Hole
Circle (C)
Magnet
Diameter (D)
Mounting
Depth (E)
8.0 in. / 203 mm
8.5 in. / 216 mm
6.94 in. / 176 mm
7.39 in. / 188 mm
5.79 in. / 147 mm
6.83 in. / 173 mm
W7: Technology
Overview
W7 Subwoofer Drivers
The W7 embodies JL Audio's commitment to pushing the envelope of
speaker technology, with six patented technologies and a completely
unique set of component parts. Each W7 model has been meticulously
engineered to reproduce sub-bass with extreme fidelity at any volume
level.
At first glance, you may only see a rather massive woofer, but as you
begin to analyze the technology and the performance envelope of a W7,
you will realize that they are much more than just another big SPL
speaker. For us, designing a pure SPL speaker, with no regard to
sound
quality, would have presented a far lesser challenge than the one we
chose to undertake with the W7 project. The goal was to design
subwoofer drivers that deliver immense output with an extremely high
level of fidelity.
It wouldn't be enough for the speaker to sound great or be loud, it
had
to do both. This goal required us to develop a deeper understanding
of
the inner behavior of speakers, new and proprietary modeling systems
and six new, patented or patent-pending technologies. We could have
made a good-sounding, big speaker without going through any of this
effort, but we chose to stretch our l