Box Guidelines
Phase Linear 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
•Speaker frames will be twisted by installation on uneven surfaces. This occurs when the surface is carpeted/padded and screws are
•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. We recommend Road Gear or Sound Quest brands of wire.
•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!
Box Calculations | UBW Series |
During construction, temporarily assemble the | mounted in a vehicle, it should be fastened |
wood making sure all pieces line up. Assemble | securely. "L" shaped brackets work adequately. |
the box before cutting the holes for the | Simple Math |
subwoofers. After the box is assembled, connect | |
an amplifier to the subwoofer, and listen for | To build a box, some math calculations must be |
whistling noises and buzzes. If the box will be | made using the formulas below. |
Calculations
Shape | Area | Volume: |
Circle (opening) | A = 0.79 x D x D | N/A |
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Cylinder (port) | N/A | V = 0.79 x D x D x H |
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Rectangle | A = H x W | N/A |
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Rectangular Box | N/A | V = H x W X D |
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Triangle | A = 0.5 x H x W | N/A |
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Triangular Box | N/A | V = 0.5 x H x W x D |
Subwoofer box calculations will need math conversions to make |
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the numbers easier to work with. Use the conversions listed. |
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| Math Conversions |
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Converting From: | Multiply By: | To Find: |
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Inches | 0.0254 | Meters |
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Square Inches | 0.007 | Square Feet |
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Cubic Inches | 0.00058 | Cubic Feet |
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Square Feet | 144 | Square Inches |
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Cubic Feet | 1728 | Cubic Inches |
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Cubic Feet | 28.3 | Liters |
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Meters | 39.37 | Inches |
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Liters | 0.035 | Cubic Feet |
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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
Areas
D
H
W
H
W
Volumes
H
D
D
H
W 
D
H
W
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