# "Rob's Car Audio Page"

## "Calculators And Formulas!"

Instructions:

1. Make sure you have Java turned on in your browser.
2. Enter required information.
3. Click "Calculate" to get the answers.
4. The calculators will give accurate results only for rectangular shaped objects.

Calculators:

1. Box Dimensions Calculator: Figures out third dimension of a box, given two known dimensions, required internal volume and material thickness. For example, if you have the length and height of a part of your trunk, and need to figure out the width of the box: Enter the two dimensions you have measured, enter the internal volume, and the thickness of the wood. If you are placing objects inside the box, such as braces, or a piece of wood to separate the box into two independent boxes for two woofers, use the "Solid Object Volume Calculator."
2. Solid Object Volume Calculator: Figures out volume of an object to be placed inside a box. Then add result to "required internal volume" in the "Box dimensions Calculator".
3. Conversion Factors: Metric to English units, Cubic inches to cu ft, etc.

 External measurements: x x ? In. Desired internal volume: Cu. Ft. Thickness of box material: In. External Box Dimensions: x x In.

 Object measurements: x x In. Volume: Cubic Feet

 - cu in / 1728 = Cubic feet - cu ft x 1728 = Cubic inches - cu ft x 28320 = Cubic centimeters - cm x 0.394 = Inches - in x 2.540 = Centimeters - ft x 30.48 = Centimeters - ft x .3048 = Meters - m x 3.281 = Feet

Power Cable Calculator
Total Amperage
Draw of System
Up to 4 ft. 4 to 7 ft. 7 to 10 ft. 10 to 13 ft. 13 to 16 ft. 16 to 22 ft. 22 to 28 ft.
0 - 20 14 12 12 10 10 8 8
20 - 35 12 10 8 8 6 6 4
35 - 50 10 8 8 6 4 4 4
50 - 65 8 8 6 4 4 4 2
65 - 85 6 6 4 4 2 2 0
85 - 105 6 6 4 2 2 2 0
105 - 125 4 4 4 2 0 0 0
125 - 150 2 2 2 0 0 0 00
The above chart shows wire gauges to be used if no less than a .5 volt drop is accepted.
Cable size calculation takes into account terminal connection resistance.

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