Diamond Audio D7402 Reference Manual - Page 4

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An additional temperature monitoring circuit protects the D7 amplifier

under extreme high power or extreme high-ambient temperature conditions.

As the heat sink temperature reaches 185 degrees Fahrenheit, this circuit

gradually turns down the high-current rail voltages, reducing the amplifier

power dissipation. This circuit only effects the high current stage of the power

supply; the operation of the sensitive low current audio circuits remain

unchanged. Only the maximum output power is affected, and only until the

heat sink cools down. Under no conditions will the D7 Series amplifiers have to

shut off completely.

If a problem arises, refer to the troubleshooting section (page 15) or call the

Diamond Audio Technical Department at (480) 813-6205 for assistance.

A WORD ABOUT BATTERIES

AND HIGH OUTPUT ALTERNATORS...

The battery in your car is a chemical storage device for electrical energy

generated by the alternator. It is capable of briefly supplying high currents for

cold starting the vehicle as well as powering other important electrical loads

either partially or entirely for a limited period when the engine is off.

In order to supply the power required for ignition, lighting, large audio

systems etc. a car needs its own efficient, reliable, and constantly available

source of energy. When the engine is stopped, the battery is the vehicle's

energy source. When the engine is running, the alternator is the on-board

"electricity generating plant." It is the job of the alternator to supply power to

all current-consuming loads (including the audio system).

Alternator output, battery capacity, and power demand of all electrical loads

and systems must be matched as ideally as possible so the entire system is

reliable and trouble-free in operation.

In the most basic of terms, this means that car audio is gasoline powered.

Extra batteries are primarily for the extended operation of your audio system

when the engine is off or for SPL competitions where high sound pressure

levels are generated for short periods of time and large battery racks are

needed to provide the necessary current demanded by the many amps used.

D7 Professional Reference Series Amplifiers are capable of reproducing "concert

level" volumes with incredible accuracy. Care must be taken to ensure that your

vehicle is capable of supplying the voltage and current required by such a

system.

POWER CABLE GAUGE CHART

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.

Example:

Amplifier 1: D7054 (driven at 4 ohms) =

Amplifier 2: D7152 (driven at 4 ohms) =

Amplifier 3: D7152 (driven at 4 ohms Bridged) = 100 amps

33 amps

50 amps

Grand Total = 183 amps