Precision Power PPI4240 warranty Total Current Draw Length of Wire to Run in Feet

The following formula is a guide to determine current draw so you can choose the proper gauge power cable and fuses for your system. A 50% amplifier efficiency rating is used as an average.

(Total 4-Ohm rate RMS output x 2) x 2 = Total Input Wattage Total Input Wattage/Supply Voltage = Current Draw (in Amps)

Example: Your PPI4240 is 30 watts x 4 RMS @ 4-Ohms.

You would use the formula below: 30 x 4 = 120 watts Total Output

120W x 2 = 240W Input/12.5v = 19.2 amps Current Draw

Note: Notice that the total power is multiplied by two. This compensates for the 50% efficiency of the amplifier. When you drop your impedance in half you double the amperage.

Total Current Draw		Length of Wire to Run (in Feet)
(in Amps)		<3	<7	<10	<13	<17	<20	<22	<28
0 - 20		14	12	12	10	10	8	8	8
20	-35	12	10	8	8	6	6	8	4
35 -50		10	8	8	6	6	4	4	4
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	0

Note: The ground wire should be the same size as the power wire.

3