Behringer manual Control Elements, Front panel, ULTRACOUSTIC ACX1000

ULTRACOUSTIC ACX1000

2. CONTROL ELEMENTS

Fig. 2.1: The front panel of the ULTRACOUSTIC

Your BEHRINGER ULTRACOUSTIC ACX1000 is equipped with 20 front panel controls, 9 push-buttons and a 2-digit, 7-segment LED display. Two 1/4" phone jacks and one XLR jack are available as well.

2.1 Front panel

Fig. 2.2: The front panel control elements

Use the 1/4" INSTRUMENT jack on the instrument channel to connect an acoustic guitar to your ULTRACOUSTIC. Please use a commercial 1/4" jack mono cable (no DIY (Do It Yourself), better ask your specialized dealer), with good mechanical and electrical shielding, so as to avoid unpleasant surprises during rehearsals or concerts.

The PHASE switch reverses the instrument channel’s phase by 180°. Use this function to eliminate feedback problems or phase errors caused by dual pickup systems.

The TUNER switch allows you to mute the instrument channel’s output. The TUNER jack on the rear of your ACX1000 provides a copy of the guitar signal for connection to an external tuner.

The GAIN control governs the volume level of the instrument channel.

When the input signal overdrives the instrument channel, the CLIP LED signals this condition. Reduce the input gain with the GAIN control, until the CLIP LED just stops lighting up. Occasional flashing of the CLIP LED, caused by signal peaks, is harmless though, because the instrument channel has sufficient headroom.

The BASS control in the EQ section allows you to boost/cut the bass frequencies on the instrument channel.

With the MID control you can boost/cut the midrange frequencies on the instrument channel.

Finally, the TREBLE control governs the instrument channel’s high frequency gain.

The ATTACK control is quite useful to emphasize attack sounds. For example, when you pick the strings of your guitar with your fingers, try turning the ATTACK control to the right. The more you do so, the more “accented” the sound becomes.

Please note that with all three EQ controls set fully to the left (instrument channel), the resulting signal will be very low-volume.

The FEEDBACK 1 control adjusts a notch filter that allows you to suppress feedback frequencies or other forms of interference. The frequency range is from 65 Hz through 400 Hz. To detect and suppress interference frequencies, please turn the FEEDBACK 1 control slowly.

The FEEDBACK 2 control determines the frequency of a second notch filter, ranging from 150 Hz through 900 Hz.

Use the EFFECT control to determine the intensity of the effect selected on the effects module (instrument channel).

The MIC jack is the balanced XLR microphone input of the microphone/line channel.

The balanced LINE/INST. jack of the microphone/line channel can be used for line-level signals, e.g. keyboards, samplers etc.

The +48 V switch activates the phantom power supply for the XLR microphone input, providing the operating voltage required for condenser microphones.

Use the GAIN control to determine the volume level of the microphone/line channel.

When the input signal overdrives the microphone/line channel, the CLIP LED signals this condition. Reduce the input gain with the GAIN control, until the CLIP LED just stops lighting up. Occasional flashing of the CLIP LED, caused by signal peaks, is harmless though, because the microphone/line channel, too, has sufficient headroom.

The BASS control in the EQ section allows you to boost/cut the bass frequencies on the microphone/line channel.

With the MID control you can boost/cut the midrange frequencies on the microphone/line channel.

Finally, the TREBLE control governs the microphone/line channel’s high frequency gain.

2. CONTROL ELEMENTS 7