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REAR PANEL
Power amp output connection for the two channels A
(left) and B (right) is provided via SPEAKON-type output
connectors.
A plastic cover to prevent inadvertent erroneous
connection protects the BRIDGED OUT connector. Make
sure to remove the cover only when actually operating the
power ampli er in Bridged-Mode.
CAUTION!
Pins 2+/2- of the CHANNEL A SPEAKON output, which
normally are not in use, are also connected to output B to
ensure comfortable connection of 2-way speaker cabinets
(e.g in Bi-Amping Mode) when using 4-wire Speakon
cables.
POWER AMP OUTPUT CONNECTORS
BRIDGED MODE
With the BRIDGED-MODE switch being engaged, using the channel A input
for audio signal feed is mandatory, since input B provides no function. While
the ampli er of channel A operates as usual, the audio signal is internally
inverted and routed to the ampli er of channel B. Both amps – A and B – now
work in push-pull operation to provide doubled output voltage at the
BRIDGED-OUT connector.
The regular output voltage of each ampli er channel A / B is still present at the corresponding output
connector CHANNEL A or CHANNEL B. However, using these signals is not recommendable because
of the aforementioned phase inversion. Operating the power amp in Bridged Mode with loads of 2ohms
connected is not allowable.
CAUTION: Extremely high voltages might be present at the BRIDGED OUT connector during
Bridged-Mode operation. The connected loudspeaker systems have to be capable of handling
such high voltages. Please make sure that power handling speci cations as stated in the docu-
mentation supplied with your speaker systems match the speci cations of the power ampli er.
GROUND-LIFT SWITCH
The ground-lift switch allows eliminating noise loops. If the power ampli er is
operated together with other equipment in a 19“ rack-shelf, setting the switch
to its GROUNDED position is recommended. If the power ampli er is operated
together with appliances with differing ground potentials, set the switch to its
UNGROUNDED position.
MAINS INPUT
Under normal circumstances, the mains fuse only blows in case of fault.
Replacing the fuse is only permissible when using a new fuse of the same
type with identical amperage, voltage and blow characteristics. If the mains
fuse blows more often, please contact an authorized service centre.
The high-performance mains cord supplied with your power ampli er complies
to applicable safety regulations, plus that its diameter corresponds to the power
amp’s power output capacity. Make sure to use the supplied mains cord for connecting the power amp
amp’s power output capacity. Make sure to use the supplied mains cord for connecting the power amp
to the mains. Using mains cords with smaller diameters results in higher leakage and consequently re-
to the mains. Using mains cords with smaller diameters results in higher leakage and consequently re-
duced maximum power output capacity.
duced maximum power output capacity.
At 100V and 120V units the mains fuse is installed internally. This is fore safety reasons. In case of a
blown mains fuse please contact a quali ed service personnel for servicing.
fuse blows more often, please contact an authorized service centre.
amp’s power output capacity. Make sure to use the supplied mains cord for connecting the power amp
fuse blows more often, please contact an authorized service centre.
fuse blows more often, please contact an authorized service centre.
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To prevent short-circuit and/or to protect your speaker systems from being damaged when connecting
the cabinets, please make sure to mind the Low- and High channels’ speci c pin-assignments!
If, for example, the subwoofer audio signal is used to feed a tweeter, it is more than likely that this will
instantly destroy the HF-driver’s coil.
WARNING:
The speaker output terminals are marked with a symbol “ ”, which signi es that these
terminals are hazardous live and present a risk of electric shock to the user.