The following is a basic formula to be used as a guide to determine current draw.
A50% amplifier efficiency rating is used as an average. Your new P C X™ a m p l i f i e r
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 POWERCLASS™ PCX 2200 amplifier has two channels at 200w
per channel RMS rating into 4 Ohms (200 x 2 = 400).
You would use the formula in the following way:
400W x 2 = 800W
800W = 66.6 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 POWERCLASS™ amplifiers will effectively double their
power at this load.
400W x 2 x 2 = 1600W
1600W = 133.3 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.
NOTE: The ground wire must be the same or larger gauge as the power wire.
Recommended Minimum Gauge
(in amps) Up to 4ft. 4 to 7ft. 7 to 10ft. 10 to 13ft. 13 to 16ft. 16 to 19ft. 19 to 22ft. 22 to 28ft.
50-65 8 8 6 4 4 4 4 2
65-85 6 6 4 4 2 2 2 0
85-105 6 6 4 2 2 2 2 0
105-125 4 4 4 2 2 0 0 0
125-150 2 2 2 2 0 0 0 00
150-200 0 0 0 0 00 00 00 000
200-250 00 00 00 000 000 000 000 0000
300-up 000 000 000 0000 0000 0000 0000 0000
Total Current Draw Length Of Wire To Be Run
17
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