Behringer ACX450 - Manual (Page 5)

5
ULTRACOUSTIC ACX450/ACX900/ACX1800
The MIC jack is the balanced XLR microphone input of the
microphone/line channel.
The balanced LINE jack (1/4") of the microphone/line
channel can be used for line-level signals, e.g. from
keyboards, drum computers, etc.
The COMPRESSOR controller is used to adjust the
intensity of the compression (only in ACX1800, see
chapter 4.3).
The compressor is switched on/off with the IN/OUT
switch (only in ACX1800).
With the FX SELECT controller, you can select one of
16 effect programs. For a detailed description of the
available effects, see table 4.1 in chapter 4.2.
With the PARAMETER controller (only in ACX1800) you
can edit certain effect parameters. For details on the
parameters that are adjustable for each effect, see
table 4.1.
The IN/OUT switch (not included in ACX450) allows you
to activate the selected effect. If an effect has been
activated, the LED in the switch is on. Alternatively, you
can switch the selected effect on and off with the foot
switch.
The FX LEVEL controller is used to adjust the level (share)
of the selected effect.
With the MASTER controller, you can adjust the overall
volume of the ACX1800.
The PHASE switch reverses the phase of the mix signal
by 180° (only in ACX1800). Use this switch to eliminate
problems with feedback.
The ULTRACOUSTIC is equipped with a CD input at the
rear panel. Use the CD LEVEL controller in the master
section (only in ACX1800) to adjust the volume of the
signal connected to the CD jack. In the ACX900 and
ACX450, this controller is located on the rear panel
(see fig. 2.2).
The CD jack of the ACX1800 can be muted with the MUTE
switch.
Use the POWER switch to switch on the ULTRACOUSTIC.
Before connecting the ULTRACOUSTIC to the power
mains, ensure that the POWER switch is in OFF position.
To disconnect the unit from the mains network, pull the
plug from the socket. When switching on the
ULTRACOUSTIC, ensure that the mains plug is easily
accessible.
+
Please note: The POWER switch does not fully
disconnect the unit from the mains power cord plug
or extention cord. To disconnect the unit from the
main power source, pull out the main cord plug or
appliance coupler. When installing the product,
ensure the plug or appliance coupler is readily
operable. Unplug the power cord when the unit is
not used for a prolonged period of time.
2. CONTROL ELEMENTS AND CONNECTIONS
ACX450
ACX900
ACX1800
Fig. 2.1: The front panel control elements