Jensen Box Guidelines, JSP1244 Series, Simple Math, Calculations, Shape, Area, Volume, To Find

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.

•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!

	JSP1244 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
Cylinder (port)	N/A	V = 0.79 x D x D x H
Rectangle	A = H x W	N/A
Rectangular Box	N/A	V = H x W X D
Triangle	A = 0.5 x H x W	N/A
Triangular Box	N/A	V = 0.5 x H x W x D
Subwoofer box calculations will need math conversions to make
the numbers easier to work with. Use the conversions listed.
	Math Conversions
Converting From:	Multiply By:	To Find:
Inches	0.0254	Meters
Square Inches	0.007	Square Feet
Cubic Inches	0.00058	Cubic Feet
Square Feet	144	Square Inches
Cubic Feet	1728	Cubic Inches
Cubic Feet	28.3	Liters
Meters	39.37	Inches
Liters	0.035	Cubic Feet

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

Areas

D

H

W

H

W

Volumes

H

D

D

H

W

D

H

W

Box Calculations