Channels; Workspace; Protection; Turn On/Turn Off Muting - powersoft M30D HDSP+ETH User Manual

10.13 Channels

Copy and paste of the current playing processing setup from/to
the clipboard is possible from the device layout.
WARNING! All changes will be lost if the preset is NOT
stored on board before unplugging the unit from the mains.
NOTE: pasting a channel preset file doesn't modify the internal
structure of a device. For example, a channel copied from a
1 in / 2 out configuration doesn't affect the internal structure
when pasted in a 2 in /2 out processing layout.
NOTE: in the 1 in / 2 out configuration the input eq is copied (or
applied) to both input eq's. For example, copying the configuration
of both channels (1 in /2 out configuration) leads to pasting the
unique input eq to both channels.

10.14 Workspace

The copy/paste function from an M Series device to another M
Series device is limited to:
The same family device (e.g. source M20D, target M20D).
The same internal processing layout (e.g. source 1IN/2OUT,
target 1IN/2OUT).
WARNING! All changes will be lost if the preset is NOT
stored on board before unplugging the unit from the mains.
FIGURE 34: Presets handling.
FIGURE 33: The output eq, there are 4 possible alternatives to
handle the curve.

11 Protection

In order to protect your device and your speakers from
accidental damage, M Series amplifiers include an extensive
automatic protection system. In the following sections, potentially
dangerous scenarios and the amplifiers' corresponding protective
response are explained in detail.

11.1 Turn on/Turn off muting

Class D amplifiers may cause severe speaker damage at power
up due to the high voltage levels at the output stage. In order to
avoid this, the outputs are muted for less than 2 seconds (less
than 5 seconds for DSP models) after turn on. Similarly, turning
off the amplifier can cause the same problem: outputs are muted
immediately at turn off.

11.2 Short circuit protection

Short circuits or very low impedance loads may destroy the
output stage of any amplifier. In order to protect the amplifier from
the dangerously high current surges arising from accidental output
short circuits or low impedance loads, all M series amps block
channel activity when the current drawn from the load rises above
a set value. The channel is muted for 2 seconds after which the
amplifier will unmute the channel and check whether the current
draw is still over the safety threshold. Should this be the case, the
amplifier will mute the channels for another 2 seconds and the
procedure will reiterate. The red "CLIP" LED will be turned off only
when the output current draw will have returned within safe limits.

11.3 Thermal protection

All Powersoft amplifiers have variable speed fans to assist cooling.
If for some reason the cooling system can't dissipate the produced
heat correctly, a thermal protection system is automatically
activated to avoid permanent damages. Every channel pair has a
temperature sensor on the output stage heat sink. Two different
protection strategies are implemented depending on the severity
of the overheating. In order to protect internal components, the
amplifier may automatically reduce output power until the internal
temperature returns to safe levels.

11.4 Thermal warning

If the heat sink reaches a temperature of approximately 75°C,
the front panel red "TEMP" LED corresponding to the overheated
channel pair turns on to warn the user of a potentially dangerous
thermal event. Output power is reduced to prevent damages to the
output stage.

11.5 Thermal shutdown

If the heat sink temperature rises above 85°C, the thermal
sensing circuitry will mute each power section of each compromised
channel pair. Only after the heat sink has cooled down to below
75°C the channel pair will automatically unmute and the red
"TEMP" LED will be turned off.
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