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DA-2800 Operating Instructions V0.4
3. Protection
3.1 Turn-On/Turn-Off muting
For about four seconds after turn-on, and immediately at turn-off, the amplifier outputs are muted.
3.2 Short circuit protection
A short circuit protection system safeguards the amplifier's outputs against short circuits and other
stressful loads. It is completely inaudible when inactive. In case of a short circuit, the red LED will
illuminate. The amplifier reset protection mode resets after 2 seconds.
3.3 Thermal protection
The DA-2800 amplifier uses a continuously variable speed fan to assist cooling (the fan speed changes
in response to the amplifier's cooling needs). If the heatsink temperature reaches approximately 75°C,
the TEMP LED illuminates, and the output power is reduced to prevent damage to the output stage. If
the temperature is more than 85°C the thermal sensing circuitry will mute each power section
channels. Once the heatsink has cooled down, the amplifier will automatically unmute, and the LED
shuts off at 75°C. The amplifier temperature can be lowered by reducing the output power.
3.4 DC fault protection
If DC or excessive subsonic energy appears at a channel output, an instantaneous protection circuit
will mute both channels of the amplifier. This amplifier shutdown protection is used in place of
speaker relays, thereby improving the damping factor and reliability of the DA-2800 amplifier.
3.5 Input/Output protection
An ultrasonic network decouples RF from the outputs and keeps the amplifier stable with reactive loads.