Behringer B2030A - Manual (Page 6)

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TRUTH B2030A/B2031A
3. APPLICATIONS
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The TRUTH should be the last device in the signal
chain to be switched on and the first to be switched
off. This way, loud switch-on “thumps” that can
occur when powering other equipment on or off
can be avoided.
Fig. 2.4: INPUT TRIM control
INPUT TRIM. Use this control to adapt the TRUTH’s input
sensitivity to the signal source.
Fig. 2.5: Rear panel control elements
LOW FREQUENCY. With this switch you can adapt the
woofer to a subwoofer system or emulate the sound
characteristics of small speaker systems.
ROOM COMPENSATION. For maximum flexibility the
TRUTH features a switch that adjusts the speaker
depending on its setup position.
HIGH FREQUENCY. This switch adapts the speaker's
frequency response to the damping characteristics of the
control room.
Fig. 2.6: Rear panel control elements
The following control elements are found only on the B2031A:
POWER MODE. This switch allows you to toggle between
“ON”, “OFF” and “AUTO” power-up modes (see chapter 3.1).
MUTE LOW. Disables the woofer for servicing and
maintenance.
MUTE HIGH. Disables the tweeter for servicing and
maintenance.
3. APPLICATIONS
3.1 Connection
Use the enclosed power cord to connect the TRUTH to the
mains. To avoid ground loops, both speakers and the mixing
console should be fed from the same outlet. For your convenience,
the B2031A features an automatic power-up system which
activates the TRUTH as soon as a signal is present on its input,
and deactivates the speaker after signal pauses of more than
five minutes (only B2031A).
Function: The switch for the automatic power-up system
has three positions. When set to OFF, the speaker is completely
switched off and cannot be activated with the POWER switch
. Position AUTO allows the automatic operation as mentioned
above. In position ON, the B2031 is activated all the time and can
be switched off only with switch .
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Be sure to switch the TRUTH off with the POWER
switch during longer pauses.
Now connect both speakers to your console by means of
commercial XLR or TRS cables. Since the TRUTH is an active
speaker system, instead of conventional speaker cables you
will need normal TRS or XLR cables.
Connect the TRUTH to the control room outputs of your console,
so as to be able to control the monitoring volume independently
of the main mix level. If your console does not have such outputs,
you can also use the main mix outputs. However, in this case the
speaker volume cannot be set independently of the main mix
level, i.e. you must adjust the monitoring volume on the TRUTH.
Please consult the operating instructions accompanying your
console to find out whether it has balanced or unbalanced outputs.
Connect these outputs to the TRS or XLR input. If possible
use the balanced connectors, so as to avoid interference and
hum. It won’t help, however, to connect unbalanced outputs
with balanced inputs. The benefits mentioned above will apply
only when both inputs and outputs are of the balanced type.
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Be sure to mute the signal sources before you put
the TRUTH into operation.
Once the TRUTH has been connected as described above,
you can activate the speaker with the POWER switch.
3.2 Level setting
When the TRUTH has been connected properly and switched
on, you can now turn up the console output that feeds the
B2030A/B2031A. Provided you have a signal source connected,
you now hear the audio material as it is played back by the
TRUTH. The INPUT TRIM control on the rear panel is set to
0 dB ex-factory, i.e. unity gain, which is okay when you feed the
TRUTH from a pro-level console. In this case, the TRUTH
automatically operates at maximum level, provided that your
console has been set up correctly and its output is set to 0 dB.
The LIMIT LED helps you control the level. It lights up as
soon as overloading causes one of the internal protections to
respond. The TRUTH doesn’t get damaged when the LIMIT LED
lights up with occasional signal peaks. However, please make
sure that it won’t light up all the time, because sooner or later this
will activate the thermal protection system and temporarily mute
the built-in amplifiers, to warn you that you are driving the TRUTH
too hard. If so, you can reduce levels either on your console or
using the INPUT TRIM control . If the outputs on your console
don’t provide studio-level signals, you can turn up the INPUT
TRIM control. If you connect the TRUTH to the preamp output of
your stereo system, it may also be necessary to raise the level
on the TRUTH itself. To build up a rudimentary stereo system,
you can directly connect the outputs of a CD player to the TRUTH’s
inputs, and use the CD player to adjust the volume.