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Indicators
The Palladium features 3 front LED indicators per channel: Clip, Signal and Power. These LED indicators
inform the user of each channel’s operating status and warn of possible abnormal conditions.
Clip LED
A channel’s red clip LED will light dimly at the onset of clipping and increase in brilliance, as clipping
becomes more severe, staying on until the clipping ceases. If the LED is flashing quickly and intermittently,
the channel is just at the clip threshold, while a steady, bright glow means the amp is fully clipped.
Reduce the gain to prevent severely clipped waveforms reaching the speakers.
Signal LED
This LED will light more insense if the input signal increases.
Power LED
This indicator LED lights, when the amplifier has been turned on, AC power is available and the low-
voltage power supply and fan are operational
Protection Features
Every amplifier incorporates several circuits to protect themselves and the speakers under virtually any
situation. Dap Audio has attempted to make the amplifier as “foolproof” as possible by making it
impervious to short and open circuits, DC Voltage and overheating.
When a problem occurs, that causes a channel to go into a protection mode, the Power LED will dim.
DC voltage on the output, excessive subsonic frequencies, or thermal overloads will cause the channel’s
output relay to disconnect the speaker load, until the problem is corrected or the amplifier cools down.
The internal fan will keep the amplifier operating well within its intended temperature range under all
normal conditions.
When a channel’s heat sink temperature reaches 90 ºC, which may indicate an obstructed air supply,
clogged air filter, etc, the channel will disconnect its load. Normal operation will resume automatically
once it cools to 80 ºC. During this time, the channel’s Power LED will dim.
Short Circuit
If an output is shorted, the protection circuit will be more sensitive, than in the normal protection situation
and will protect the channel’s output transistors from the current stress. The channel’s Power LED will dim.
If the short circuit remains, the channel will eventually thermally protect itself by disconnecting the load.
DC Voltage Protection
If an amplifier channel detects DC voltage at its output, its output will immediately open to prevent
speaker damage. The channel’s Power LED will dim.
Subsonic Frequencies
All amplifiers have a built-in subsonic frequency protection circuit, cornered at 10Hz, for each channel.
An additional feature is a special high frequency protection technology, which enables you to
automatically disconnect speakers, when excessive high frequency energy appears at the output.
Turn-On/Turn-Off-Protection
At power up, the speakers are disconnected. The power supplies charge for about 2-3 seconds and
stabilize, and then the speakers are connected. When power is removed, speaker loop is synchronized
with the turn off signal, therefore no thumps or pops are heard.
Speaker-Protection
All amplifiers automatically protect speakers from DC voltage, subsonic signals and excessive high
frequency signal, but users should be aware of the application limits of their speakers.
Be aware that the amplifiers power does not exceed the speaker’s power capabilities.
