DAPAudio VPA-150 Producthandleiding - Pagina 9

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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.