Reliability - Protection Functions; Factory Settings - DAD PX Series User Manual

Reliability - Protection function
This amplifier has many protecting functions that give to this product a great reliability.
These protections prevent damages either to amplifier or to loudspeakers.
1. Clip / limiter
When the amplifier output appears to be clipped, to avoid damages to the speakers, a built-in
clip/limiter automatically limits too high input signals. This function can be activated by the switch
placed on the amplifier's rear panel (PX3600+ and PX5000+ only)
2. Over-heat protection
This equipment works at a rated temperature range (see page 15). If the environment's temperature
exceeds the rated values or the user employment is not correct, it will cause an internal temperature
increase. In this case, output power is automatically limited until the temperature will be again into its
normal range values.
3. VHF protection (PX3600+ and PX5000+ only)
If a non-musical signal, exceeding audio range, occurs in the input, the amplifier will limit output power
to protect itself and the speakers. Normal output power will be automatically recovered when the VHF
signal is cut off.
4. Short-circuit protection
When a short-circuit occurs on the amplifier's output (protection limit is below 1 ohm), the amplifier
will limit its output power. It will be automatically recovered as soon as the short-circuit is
removed.
5. VLF protection
If a continuous long-period non-musical signal (VLF), occurs in the input, the amplifier will
automatically attenuate the input signal and limit the output power in order to protect itself
and the speakers. Normal output power will be automatically recovered when the VLF
signal is cut off.
6. DC protection
If the output signal exceeds a rated DC voltage, an output protection function disconnects the load,
to protect the speakers.
7. Automatic "Fade-in" function
When the amplifier starts up or automatically restarts up in consequence of a protection releasing,
the amplifier output level will grow gradually, either to protect the amplifier and speakesr or to allow
the ears' adaptation.

Factory Settings

1. All volume control was set at "-80" ;
2. Grounding switch was set at "ON" ;
3. Working mode was set at "STEREO" .
4. Sensitivity switch was set at "0.775V .
5. Limiter switch was set at "ON" .
6. Low-pass switch was set at "OFF" . (PX3600+ and PX5000+ only)
7. High-pass switch was set at "OFF" .
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