Behringer Digital Processor-Controlled 600-Watt 12" PA Speaker System with Integrated Mixer B1220DSP - Manual (Page 6)

6 EUROLIVE B1220DSP User Manual
The B1220DSP is equipped with a 2-band tone control. Each band allows you to
apply a maximum boost/cut of 15 dB, in its center position the equalizer is set
to neutral.
(7) Use the EQ HIGH control to cut or boost the treble range by 15 dB. The cut-off
frequency is 12 kHz.
(8) Use the EQ LOW control to cut or boost the bass range by 15 dB. The cut-off
frequency is 100 Hz.
(9) The B1220DSP features a high-pass filter with a slope of 24 dB/oct.
to eliminate unwanted low-frequency content, such as pop sounds
produced by hand-held microphones, or rumble or wind noise when
using high-sensitivity microphones. The LOW CUT control adjusts the
cut-off frequency. If you want to use the B1220DSP in combination with
a subwoofer, you can use the high-pass filter to lower the bass range
reproduced by the subwoofer. This allows you to operate the B1220DSP
even without an external frequency crossover. Set the cut-off frequency to
the highest frequency that can be reproduced by the subwoofer.
(10) The CONTOUR switch governs the dynamic contour filter:
SPEECH
Setting the CONTOUR switch to SPEECH (switch not pressed) will optimize the
frequency response for speech applications. This ensures better intelligibility.
MUSIC
Setting the CONTOUR switch to MUSIC (switch pressed) will optimize the
frequency response for music playback.
(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