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WIRING
The following is a basic formula to be used as a guide to determine current draw. A 50% amplifier
efficiency rating is used as an average. Your new VGA amplifier is more efficient than most other amplifiers.
This formula is to be used as a guideline. Using wire of a larger gauge can only improve the current transfer
of your system. Do not use smaller gauge wire.
Total Amplifier RMS output x 2 = Total Input Wattage from car
Total Input Wattage = Current Draw (in Amps)
Supply Voltage
Example: A VGA amplifier has two channels at 175w per channel RMS rating into 4 Ohms (175 x 2 = 350).
You would use the formula in the following way:
350W x 2 = 700W
700W = 58.3 Amps Total current draw.
12V
If the same amplifier is driven into a 2 Ohm stereo or 4 Ohm mono load, double it's 4 Ohm RMS rating. All
VGA amplifiers will effectively double their power at this load.
(160W x 2) x 2 = 640W
640W = 116.7 Amps Total current draw.
12V
If you are using more than one amplifier, add up the total current draw for all of them and choose the
appropriate gauge based on the grand total.
POWER WIRE CALCULATOR
Total Current Draw
(in amps)
Up to 4ft.
25-50
10
50-65
8
65-85
6
85-105
6
105-125
4
125-150
2
150-200
0
200-250
00
NOTE: The ground wire must be the same gauge or larger as the power wire.
4 to 7ft.
7 to 10ft.
10
8
8
6
6
4
6
4
4
4
2
2
0
0
00
00
Length Of Wire To Be Run
10 to 13ft.
13 to 16ft. 16 to 19ft. 19 to 22ft.
8
6
4
4
4
2
2
2
2
2
2
0
0
00
000
000
7
6
4
4
4
2
2
2
2
0
0
0
0
00
00
000
000
22 to 28ft.
4
2
0
0
0
00
000
0000
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