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Behringer Ultracoustic ACX450 User Manual

Page 6

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6

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.

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