IMPORTANT!!
REMEMBER !!
he majority of failures seen with Class D amplifi ers are due to people using them in vehicles without the proper electrical con-
siderations. The common misconception about Class D amplifi ers contributes to this problem, since the
amplifi er and very effi cient, the misconception is that it doesn’t pull huge amounts of current. This is partly true, a
capable of drawing 120 amps of current at max draw. At 120 amps of current to produce over 1000 watts is very effi cient, while
some class A/B amplifi ers need over 200 amps to produce the same power. A normal stock automobile sees it diffi cultly, 120
amperes is a very high amount of current and posses a very high strain on it’s electrical system.
We at Crossfi re strongly suggest using one dedicated high quality battery per
1000D or two batteries per
We also recommend upgrading the vehicles alternator whenever possible.
It is very important to keep your battery voltage above 11 volts and as close to 14.4 volts as possible. Not only do you get more
power at 14.4 volts but you are risking serious damage to your amplifi er below 11 volts. Ohms law states that current equals power
(watts) divided by voltage. This means that current and voltage are inversely proportional, in other words as your battery voltage
falls your amplifi er has to draw more current to make the same amount of power. At a certain point the amp draws so much current
that damages components in the input section. This is very common in all Class D amplifi ers. The solution is to keep your battery
voltage between 12 volts and 14.4 volts. If you follow the tips below you will get the best of most reliable performance from your
1. Make sure the automobile has an electrical system that will support the audio systems current draw.
2. Upgrading your alternator for multiple amplifi ers is recommended
3. Use at least one (1) high quality battery per
1000D or two batteries for
4. For runs of 20ft or less use at least one 4 awg power wire and one 4 awg ground wire per
1700D. If you are using one wire with a distribution block for multiple amps, make sure to use a larger gauge wire
5. Be sure to test battery voltage at the amplifi er terminals white the system is playing at high volume. Make sure this reading stays
as close to 14.4 volts as possible, if this measure is below 12 volts see above tips or email
Crossfi re Technical Support at tech@crossfi recaraudio.com.
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