Behringer user manual Setting up the B1220DSP, Application examples

EUROLIVE B1220DSP

(11)The TIMED TURNOFF switch activates the automatic turn- off function:

ON

When the switch is actuated (ON position), the automatic switch-off is active. The loudspeaker is turned off auto- matically when it receives no signal for more than 3 minutes. As soon as a signal is received, the loudspeaker is switched back on.

OFF

If the switch is not actuated (OFF position) then the speaker remains switched on and can only be deactivated via the POWER switch {2}.

(12)A noise-gate allows you to eliminate unwanted noise during signal pauses. This is done by a circuit that mutes the output when the signal level drops below a preset threshold. Use the NOISE GATE control to determine the threshold below which the noise-gate closes.

(13)The TH LED lights up as soon as the signal level drops

below the threshold value adjusted with the NOISE GATE control (12) (the noise-gate closes).

3. Setting up the B1220DSP

The sound of your B1220DSP largely depends on the room acoustics. Please observe the following hints to get the most out of your B1220DSP.

3.1 Tweeter

High frequencies are the very part of the audio spectrum that ensure a clear perception of sound and speech intelligibility. Although these frequencies can be located most easily, they are also the first to be blocked acoustically. We therefore recommend that you set up your speakers on speaker stands (not included), so that the tweeter radiates its signals slightly above the heads of the audience. This will ensure both an optimum dispersion of the high-frequency content and a considerably improved speech intelligibility.

Fig. 3.1: B1220DSP mounted on a stand

3.2 How to avoid feedback

Always place the microphones (viewed from the audience) behind the B1220DSP, never in front of it (Fig. 3.2). When you wish to adjust the controls on the B1220DSP while holding a microphone, please approach the loudspeaker from the rear to avoid feedback.

Fig. 3.2: Right and wrong positioning

To avoid feedback, it is recommended that you carefully select and direct the microphones used. Basically, you should use microphones with a high directivity, i.e. with a cardioid or hyper- cardioid polar pattern. Never hold a microphone so that its main pick-up area points directly towards the loudspeaker. When you hold it with its less sensitive side towards the speaker box, you can move closer to the speaker.

+If you encounter persistent feedback problems, consider using our proven FEEDBACK DESTROYER PRO FBQ2496 for line-level signals. For signals with line or microphone level, we recommend our BEHRINGER SHARK DSP110.

4.Application examples

4.1 Presentations

With just one B1220DSP and one or two dynamic microphones, you can set up a basic audio system with very little effort. Thanks to the built-in mixer section, you can connect the microphones directly to the B1220DSP. Mount the B1220DSP on a speaker stand for optimum presentation and intelligibility of announcements. If one B1220DSP is not enough, you can, of course, use a second or even more loudspeakers.

Connecting microphones:

=Turn the LEVEL controls {3} fully to the left.

=Connect your microphones to the MIC/LINE inputs.

=Switch on the B1220DSP.

=Turn the LEVEL controls {3} gradually clockwise to set the volume of your choice. Observe the CLIP LEDs while adusting the volume. Make sure they never shine constantly but only light up at peak levels.

=Use the LINE OUT connector {6} to connect an (optional) second B1220DSP.

+Never place a microphone directly in front of the loudspeaker owing to danger of feedback! When operating the B1220DSP make sure that you always stay behind the loudspeaker to avoid feedback.

EUROLIVE B1220DSP	EUROLIVE B1220DSP
(optional)

Fig. 4.1: Connecting microphones

4. Application examples 7