ULTRACOUSTIC ACX450/ACX900/ACX1800
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.
6 | 2. CONTROL ELEMENTS AND CONNECTIONS |