Overheating
DC offset
Overloading
PLEASE NOTE:
Lightning strikes
Connecting cables
Fuses
CAUTION:
Optional
accessories
7
THE PROTECTION CIRCUIT
The protection circuitry of the 911 MK 3 operates outside of the signal path. It constantly monitors
the operating condition with regard to overheating, DC offset at the outputs and overloading.
If the protection circuit recognizes an overheating condition in one or both channels of the power amp
it will automatically switch off both speaker outputs and the
POWER LED (3)
goes out.
Simultaneously the amp switches to stand - by mode.
If this happens we recommend, as a matter of precaution, to turn the volume at the pre - amp stage all
the way down. After the necessary cooling - off period the 911 MK 3 can be switched back on with the
POWER - button (2)
. It will come on only after the temperature has fallen back within the permissible range.
If DC offset at the speaker output terminals of the 911 MK 3 exceeds the tolerance limit the outputs are
automatically switched off. We recommend, as a matter of precaution, to turn the volume at the pre - amp
stage all the way down. The amp will turn the speaker outputs back on as soon as DC offset falls within
the tolerance limit.
If peak currents at the speaker outputs of the 911 MK 3 exceed the permissible maximum the speaker
outputs are switched off automatically. We recommend, as a matter of precaution, to turn the volume
at the pre - amp stage all the way down. The amp will turn the speaker outputs back on as soon as
peak currents fall within the tolerance limit.
GENERAL INSTRUCTIONS
The AC cord must be unplugged before removing the housing cover – danger of an electric shock !
Especially during the summer malfunctions often occur due to voltage spikes in the power lines after
lightning strikes. Completely unplugging the power cord offers the only effective protection. Merely
switching the 911 MK 3 off with the
AC mains switch (7)
does not suffice since voltage spikes are able
to arc over separated contacts.
We supply custom - made balanced as well as unbalanced interconnect cables of any length to ensure
the best sound quality of the power amplifier 911 MK 3. The impedance of our cables is ideally matched
with all BURMESTER audio components. For the cleanest power to all components we recommend
our triple - shielded power cord BURMESTER - POWER.
The fuses are located behind the safety cap of the
AC voltage selector (9)
. They should be changed
by an expert only.
Always unplug the AC cord before opening the safety cap of the AC voltage selector – danger
of an electric shock !
MONO adapter cables (14)
for MONO operation of the 911 MK 3
BI - AMP - adapter cables (15)
for BI - AMPING operation of the 911 MK 3
