Diamond Audio Technology D3 Series Setting The Gain, Setting The Crossover, Troubleshooting

SETTING THE GAIN

The best way to set the gains on any amplifier is with an oscilloscope and test tone. Using the scope will ensure the amplifier is not clipping and protect your system from being damaged from being overdriven. If you have an oscilloscope and need help using it, feel free to call DAT Technical Support for help.

Another way is with a multi-meter and test tone. Set the multi-meter to DC voltage, play

the test tone at 75% volume. Tune gains up until DC voltage is present, then back the gains back down a little.

If an oscilloscope, multi-meter, or test tone is not available, find out the output signal voltage of the head unit. Match the gain knob with that amount of voltage. It should be between 500 mV and 5 V. If it is above 5 V, the head unit has too much signal and the amp will clip even with the gain set at minimum. Turn system on and volume to 75%, if there is noticeable distortion, gains should be tuned down some.

SETTING THE CROSSOVER

Select LP or HP using the Crossover Mode Switch, select desired frequency by turning the Frequency Knob.

SETTING THE BASS BOOST

If there is a noticeable lack of low end frequency, the bass boost can be used to raise the level of bass in the system. Turn the system on to normal listening levels and raise the bass boost until the level of bass is satisfactory.

Caution: If "popping" , "crackling" ,or any other unusual noise is heard from the system when using the bass boost, immediately turn the boost down to avoid damaging components in the system. Also, if the bass sounds "muddy" or distorted, turn the bass boost down.

TROUBLESHOOTING

Problem

No Audio Output

Solution

Low or no turn-on voltage. Check remote connections at amp and head unit.

Check remote voltage at amp with multi-meter, there should be around 12 volts when head unit is on.

Blown Fuse. Check both main system fuse and amplifier fuse. If blown, replace with fuse of same type and rating.

Loose Connections. Check all power and signal wires to make sure they have solid connection.

Speaker lead shorted. Check all speaker wire to make sure they are not shorted out somewhere.

Blown speakers. Check speaker impedance with multi-meter, if the woofer is blown, it will read a dead short.

Problem

Amplifier cycles on and off.

Solution

Thermal protection circuits are shutting the amplifier off. Check location of amplifier for adequate ventilation. Check impedance at amplifier for correct load. Check voltage at amplifier for low voltage.

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