8
THE PROTECTION CIRCUIT
The protection circuitry of the 911 operates outside of the signal path. It constantly
monitors the 911’s operating status for overheating, DC offset at the outputs and peak
current.
If the temperature in one or both channels of the device exceeds the permitted maximum, the
speaker outputs will automatically be switched off and the
POWER LED (3)
will go out. The device
will also switch to stand-by mode at the same time.
If this happens, we recommend turning the volume on the preamplifier or the system all the way
down as a precaution. After the necessary cooling-off period, the 911 can be switched back on
using the
POWER button (2)
. The 911 will not allow you to switch it back on until the temperature
has dropped below the maximum permissible limit.
If DC offset at the speaker output terminals of the 911 exceeds the tolerance limit, the speaker
outputs will automatically be switched off. If this happens, we recommend turning the volume on
the preamplifier or the system all the way down as a precaution. The 911 will activate the speaker
outputs again once the DC voltage has dropped below the maximum permissible limit.
If the peak current at the speaker output terminals of the 911 exceeds the maximum tolerance limit,
the speaker outputs will automatically be switched off.
If this happens, we recommend turning the volume on the preamplifier or the system all the way
down as a precaution. The 911 will activate the speaker outputs again once the current has dropped
below the maximum permissible limit.
GENERAL INSTRUCTIONS
Please read the operation manual for your device carefully and keep it in a safe place.
If you have any questions, please contact your dealer.
An operating temperature that is too high or too low may cause the device to malfunction. As such,
we recommend letting the device sit for a while after unpacking and before connecting and
operating it.
When choosing a place for your device please observe the following guidelines:
- Avoid direct sunlight
- Do not subject the device to excessive heat, cold, humidity or dust
- Provide adequate air circulation; do not place the device on an enclosed shelf
- The slots and openings in the device are designed for ventilation. They must not be covered.
- Please make sure that the device is not exposed to dripping or splashing water, and do not place
containers of liquid on your device.
- Open flames such as candles should not be placed on top of the device.
Before putting the device into operation, check to see if the mains voltage specified on the back
panel of the device below the AC input matches the mains voltage for your household. If this setting
needs to be changed, this may only be done by a trained professional.
Always use the 3-wire power cable supplied with the device to connect it to the power supply. The
protective earth contact must never be disabled. Furthermore, the device must be connected to
a mains socket with a properly functioning protective earth connection.
Temperature
DC offset
Peak current
Operating
temperature
Setup
Mains voltage