powersoft K2 User Manual

In order to protect your device and your speakers from
accidental damage, K Series ampliers include an extensive
automatic protection system.
13 : 1.Turn-On/Turn-Off muting
For about four seconds after turn-on, and immediately
at turn-off, the amplier outputs are muted. Class D ampli-
ers 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 about 4
seconds after turn on. Similarly, turning off the amplier can
cause the same problem: outputs are muted immediately
at turn off.
13 : 2.Short circuit protection
Short circuits or very low impedance loads may destroy
the output stage of any amplier.
In order to protect the amplier from the dangerously
high current surges arising from accidental output short
circuits or low impedance loads, all K series amps stop
channel activity when the current drawn from the load rises
above a set threshold.
In case of short circuit, the topmost front panel red LED
will light-up. At the same time, the “PROT” warning appears
in the rst line of the LCD display. The channel is muted for
2 seconds after which the amplier will check whether the
current draw is still over the safety threshold. Should this be
the case, the amplier maintain muted the channel and the
procedure will reiterate every 2 seconds.
The amplier will therefore automatically self-reset the
channel every 2 seconds. Once the amplier channel has
undergone 50 resets and the output current draw is still
above safe limits, the channel enters a permanent protec-
tion mode: an on/off cycle is needed to restart the unit
and restore it to full functioning mode. The red LED will be
turned off and the amplier will return to normal operating
conditions only when the output current draw returns to ac-
ceptable levels.
13 : 3.Thermal protection
All K Series ampliers use a continuously variable speed
fan to assist cooling (the fan speed changes in response to
the amplier’s cooling needs).
If the heat sink temperature reaches approximately
80°C, the yellow front panel LED starts blinking. If the
temperature should rise above 85°C the thermal sensing
System and signal protections
14
circuitry will mute each power section channels, the yellow
LED will be steadily on, and the power supply will be cut off.
At the same time, the “PROT” warning appears in the rst
line of the LCD display.
Once the heatsink has cooled down, the amplier will
automatically reset and the yellow LED will go off. One pos-
sible way to reduce the temperature is to reduce the output
power.
13 : 4.DC fault protection
In order to protect your speakers from mechanical
damage caused by a DC signal coming from the amplier’s
output, a DC detection circuit is placed between the ampli-
er’s output stage and power supply.
If a DC signal or excessive subsonic energy appears at
a channel output an instantaneous protection circuit will cut
off the power supply to both channels. Power supply shut-
down is used instead of speaker relays in order to improve
the damping factor and reliability of K Series ampliers. At
the same time, the “PROT” warning appears in the rst line
of the LCD display.
13 : 5.Input/Output protection
An ultrasonic network decouples radio frequencies from
the outputs keeping the amplier stable with reactive loads
and protects the loudspeakers against strong very high
frequency non-musical signals above the audible range.
34 | K Series | User guide

powersoft K2 Specifications

General

Brand	powersoft
Model	K2
Category	Amplifier
Language	English