Amp Current Draw; Formula - Diamond D9 & TDX TECHNOLOGY Owner's Manual

Amp Current Draw...

The following basic formula can be used as a quick guide to determine the total
amperage draw of a mobile audio system. This formula is based on a 50% amplifier
efficiency rating. Diamond Audio D9 amplifiers are actually much more efficient than
that, but others may be less.

Formula:

Total amplifier rated RMS power x 2 = Total Input Wattage
Total Input Wattage/Battery Voltage = Current Draw (Amps)
Examples:
A D9 800.4 amplifier has 4 channels at 100 Watts per channel RMS into 4 Ohms
totaling 400 Watts. Work the formula as follows:
400 Watts x 2 = 800 W
800 W/13.8 V = 58 A Total Current Draw
A D9 800.2 driven to a 4 ohm mono load has 800 Watts RMS of output, it's current
draw is figured this way:
800 Watts x 2 = 1600 W
1600 W/13.8 V = 115.9 A Total Current Draw
Note: If you are installing multiple amplifiers, add up the total current draw for all of
them and choose the appropriate gauge based on the grand total.
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