Overall
Depth
8.32 in.
(211 mm)
Mounting
Depth
6.83 in.
(173 mm)
Overall
Diameter
8.5 in.
(216 mm)
Bolt Hole
Circle
7.39 in.
(188 mm)
12 Holes
Magnet
Diameter
5.79 in.
(147 mm)
Mounting
Hole
Diameter
6.94 in.
(176 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.
3
Grille Clearance: 2.3125 in. (25 mm) from the bottom of the mounting flange to the
lowest inside surface of the grille.
Displacement: 0.06 cu. ft. (1.7 ltrs)
Net Weight: 17 lbs. (7.8 kg)
Mounting Hardware: Twelve #8 x 1.00" long clear, zinc-plated steel Phillips pan-head
sheet metal screws (included) or twelve #8-32 long steel Phillips pan-head machine screws
with #8-32 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 “W7 Instalation: Mounting System ” sheet for
detailed, step-by-step instructions.
PORTED ENCLOSURE:
Recommended Net Volume: 1.0 cu. ft. (28.3 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: 0.75 in. (19 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.
SEALED ENCLOSURE:
Recommended Net Volume: 0.875 cu. ft. (24.8 ltrs.)
Fc: 46.0 Hz F3: 41.3 Hz Qtc: 0.797
Front Baffle Thickness: 0.75 in. (19 mm)
Wall Thickness: 0.75 in. (19 mm)
External Width
23.25 in.
(591 mm)
External Height
10.0 in.
(254 mm)
Slot Height
8.5 in.
(216 mm)
External Depth
12.0 in.
(305 mm)
External Width
14.0 in.
(394 mm)
External Height
10.0 in.
(292 mm)
External Depth
16.75 in.
(464 mm)
Extension Length
13.0 in.
(330 mm)
Slot Width
1.5 in.
(38 mm)
Slot Length
26.0 in.
(572 mm)
Slot Width
1.5 in.
(38 mm)
Driver Specifications
Enclosure Specifications
2
Infrasonic Filter:
Turn "Off" for Sealed Enclosure.
Turn "On" for Ported Enclosure.
Input Sensitivity Controls:
Proper adjustment of these controls is critical!
For virtually all aftermarket head units,
set "Input Voltage" to "Low".
Dual Mono Speaker
Output Connections:
Connect 8ga. wire directly to "+"
and "–" "Subwoofer Output"
connections and to the W7.
LF Boost:
Generally not necessary in
W7 applications (we
recommend defeating it by
turning the dial to "0").
Amp Low-Pass Filter:
Set "Mode/Slope" switch to "24dB". Set
"Filter Freq. (Hz)" knob to "85". Lower
settings are likely to result in a poor transition
between the upper response of the W7 and
the lower response of the mid-bass speakers.
Amplifier Input:
Connect RCA-type cables from
the head unit (or processor) to
these two jacks. Use both jacks
(with a Y-adapter if necessary).
JL AUDIO 250/1:
Recommended for single 8W7-3
These settings are intended as a “baseline” for tuning your
system. Depending on your vehicle and your preferences,
some variation in the crossover and bass control settings
may be necessary for optimum performance.
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 ltrs)
One-Way, Linear Excursion (Xmax)*: 0.75 in. (19 mm)
Thermal Power Handling (Pt): 300 Watts Continuous
Reference Efficiency (no): 0.112 %
Efficiency (SPL @ 1W/1m): 82.7 dB
DC Resistance (Re): 2.78Ω
Effective Piston Area (Sd): 38.0 sq. in. (0.0245 sq. m)
Nominal Impedance (Znom): 3Ω
250W 500W 1000W 2000W 4000125W
RECOMMENDED CONTINUOUS (RMS) POWER RANGE FOR ONE SUBWOOFER DRIVER:
= position of knob
= position of switch
= switch with tw
o possible positions
= setting will vary
8W7-3
Amplifier Recommendation: 250/1
* Xmax specifications are derived via one-way voice coil overhang method with no
correction factors applied.
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