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Box Guidelines
Jensen recommends that you have your
subwoofers professionally installed. If choosing
to do your own installation, please note the
following:
• Make sure all moving parts and factory
electrical wires are cleared.
• Leave slack in the wire to prevent pulling or
stretching.
• Tie down wires to prevent them from getting
caught or shorted.
• Do not mount subwoofers where they might be
subjected to moisture.
• Correct subwoofer polarity must be used. The
polarity positive side is marked by a (+) sign or
red dot. Subwoofers out-of-phase will have
little bass output.
Box Calculations
During construction, temporarily assemble the
wood making sure all pieces line up. Assemble
the box before cutting the holes for the
subwoofers. After the box is assembled, connect
an amplifier to the subwoofer, and listen for
whistling noises and buzzes. If the box will be
Shape
Circle (opening)
Cylinder (port)
Rectangle
Rectangular Box
Triangle
Triangular Box
Subwoofer box calculations will need math conversions to make
the numbers easier to work with. Use the conversions listed.
Converting From:
Inches
Square Inches
Cubic Inches
Square Feet
Cubic Feet
Cubic Feet
Meters
Liters
TOLL-FREE INSTALLATION ASSISTANCE
The installation and wiring connections for this unit are so simple, we doubt you'll need our help, but, if you
do, we're here to help you. Just call our toll-free telephone assistance line at 1-800-323-4815 during the days
and hours shown (U.S.A. and Canada only)
Hours: 8:30AM - 7:00PM EST Monday - Friday
9:00AM - 5:00PM EST Saturday
• Speaker frames will be twisted by installation
on uneven surfaces. This occurs when the
surface is carpeted/padded and screws are
over-tightened.
• If using more than one subwoofers, be sure that
the combined impedance values cannot damage
the amplifier.
• Speaker wire should be isolated from the
vehicleís electrical system to avoid noise being
picked up by the amplifiers.
• Speaker wire should be large enough to carry
the full power of the amplifier. 14 gauge or
larger sizes are adequate.
• Be sure to give your ears a break if you listen
loud. Listening loud for extended periods can
damage your hearing!
JPW Series
mounted in a vehicle, it should be fastened
securely. "L" shaped brackets work adequately.
Simple Math
To build a box, some math calculations must be
made using the formulas below.
Calculations
Area
A = 0.79 x D x D
N/A
A = H x W
N/A
A = 0.5 x H x W
N/A
Math Conversions
Multiply By:
0.0254
0.007
0.00058
144
1728
28.3
39.37
0.035
Volume:
N/A
V = 0.79 x D x D x H
N/A
V = H x W X D
N/A
V = 0.5 x H x W x D
To Find:
Meters
Square Feet
Cubic Feet
Square Inches
Cubic Inches
Liters
Inches
Cubic Feet
Areas
D
H
W
H
W
Volumes
H
D
D
H
W
D
H
W
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