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5.4.4 Overheat protection
Due to insufficient ventilation, ventilator fault or too high environment temperature while playing at high
volume, overheating may occur. In such a case the protection circuit detaches the speaker cabinets until the
temperature of the power stage cools down. This is being displayed by the Mute LED.
5.4.5 Ventilator control
The control of the cooling ventilator is based on the temperature of the power stage's heatsink. It
automatically switches itself on when the temperature reaches 60° C and switches itself off when temper ature
decrease below 50° C.
Do not cover the ventilation cutouts!
5.4.6 Limiter
This function protects the power section against distortion. When it detects distortion on the output,
decreases the input signal of the power stage. In practise, there is no significant distortion on the power
stage when you overdrive it, the system will only lose some of its dynamics.
5.4.7 Phantom power
You can activate the phantom power function in the amplifier to supply your active bass electronic connected
to Active input. So you do not need a battery in your bass.
Requirements:
-
stereo instrument cable
-
activate the phantom power by the DIP switch located on the bottom of the amplifier. The
settings are described in section 5.4.8.
-
if you use electronic without support phantom power, you have to disconnect the battery and
make a short circuit on the battery clip in the bass.
Note:
The phantom power can supply 14,5V and max. 6mA. You get more headroom compared to the use of one
9V battery before. Make sure that your electronic circuit can handle more voltage than 9V. If not, you can set
only 9V on the DIP switch.
Warning:
If you use this function, pay attention that you Mute the amplifier before plug in or out the instrument cable.
5.4.8 DIP switches
The four DIP switch section is located on rear panel of the amplifier. You can set these functions:
1. if ON, the Shape can be activated by the first button of the Foot Switch
2. if ON, the Valve Loop can be activated by the first button of the Foot Switch
3. if ON, the activates the phantom power
4. if ON, the phantom power supplies only 9V instead of 14,5V
Note:
If both switch 1. and 2. are ON, then you can switch on both the Shape and Valve Loop.
5—13
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