Behringer Eurolive Digital Processor-Controlled 600-Watt 12" PA Speaker System with Integrated Mixer B412DSP - Manual (Page 7)

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EUROLIVE B412DSP
3. Setting up the B412DSP
OFF
If the switch is not actuated (OFF position) then the speaker
remains switched on and can only be deactivated via the
POWER switch .
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.
The TH LED lights up as soon as the signal level drops
below the threshold value adjusted with the NOISE GATE
control (the noise-gate closes).
The LED on the front indicates the following operating status:
Indicator Operating status
BLUE light The device is switched on
BLUE light
(dimmed) Device is on standby
(if TIMED TURN-OFF activated)
VIOLET light same function as CLIP LED
^`
flashing RED
Device is overheating!
Switch off the speaker until it cools down
Tab. 2.1: Frontal LED operating status
3. Setting up the B412DSP
The sound of your B412DSP largely depends on the room
acoustics. Please observe the following hints to get the most out
of your B412DSP.
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: B412DSP mounted on a stand
3.2 How to avoid feedback
Always place the microphones (viewed from the audience)
behind the B412DSP, never in front of it (Fig. 3.2). When you
wish to adjust the controls on the B412DSP while holding a
microphone, please approach the loudspeaker from the rear to
avoid feedback.
Fig. 3.2: Right and wrong positioning
Since the B412DSP can be placed on the floor at an angle as
shown in the illustration below, you can also use it as a monitor
speaker on stage. In contrast to PA speakers, stage monitors
are used to direct sound towards individual performers on stage.
When microphones are used, it is not easy to position the monitor
speakers, since the microphones are moved around in front of
them, often coming very close. 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.
Microphones with a cardioid polar pattern should always be
directed at a 90° angle to the axis of the loudspeaker (Fig. 3.3,
left). Microphones with a hyper-cardioid polar pattern should
always be positioned at an acute angle to the axis (Fig. 3.3,
right).
Fig. 3.3: The B412DSP as a monitor loudspeaker
+
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.