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ULTRACOUSTIC ACX450/ACX900/ACX1800
2. CONTROL ELEMENTS AND CONNECTIONS
2.2 Rear panel
ACX450
ACX900
ACX1800
Fig. 2.2: Rear panel connectors
Use the balanced LINE outputs (XLR connections) to
connect your ULTRACOUSTIC to the inputs of a mixing
desk (only in ACX1800 and ACX900).
With the GND LIFT (ground lift) switch you can
disconnect the ground connection between the amplifier
and the mixing desk (switch pressed). This is done to
eliminate buzz or ground loop hum.
You also have the option to take up the audio signal from
the instrument channel at the TUNER output and to feed
it to the tuner. There is a continuous signal at this jack.
Connect the supplied double foot switch to the
FOOT SW(ITCH) jack. The foot switch enables you to
switch the effects of both channels on and off
(corresponds to the function of the IN/OUT switch ).
The CD IN input (RCA) allows for the connection of an
external stereo source. You can for example play your
favourite tune while being accompanied with music from
a CD, MD or a drum machine.
+ MIC INSERT: The microphone channel is equipped
with a serial loop connection for external effects units.
To do this, connect the SEND jack with the input of
your effects unit. Connect the output of the external effects
unit to the RETURN jack
of the ULTRACOUSTIC.
+ INST(RUMENT) INSERT: The instrument channel is
also equipped with a serial loop connection for external
effects units. is the respective SEND connector
(output) and is the respective RETURN connector
(input).
+ The INSERT SEND connector can also be used as
parallel outputs, e.g. to individually feed the signal
of one channel. As long as the RETURN connector
is not used, the internal signal flow is not
interrupted.
Fig. 2.3: Standard IEC power receptacle,
fuse holder and serial number (rear panel)
Power is supplied via an IEC connector. The matching
cable is provided with the unit.
FUSE RETAINER/VOLTAGE SELECTOR: Please make
sure that the voltage indicated by the voltage selector
matches the local voltage before you connect the unit to
the main power supply. Always replace blown fuses with
fuses of the same type and rating. Some units feature a
fuse retainer in which a selection between 230 V and
120 V is possible. Please be aware: When using your unit
outside of Europe with 120 V, a fuse with a higher rating is
required.
SERIAL NUMBER.