Behringer TRUTHB2092A manual Input signal level adjustment, Correct placement

TRUTH B2092A

Connect the mixing console outputs to the B2092A inputs marked

LEFT and RIGHT . If you are using active monitors as main loudspeakers (e.g. B2030A or B2031A), connect the left loudspeaker to LEFT OUT, and connect the right loudspeaker to RIGHT OUT. If using passive loudspeakers, connect LEFT OUT and RIGHT OUT connectors to the power amplifier inputs. The B2092A separates the bass segment of the audio signal for the subwoofer and sends all frequencies above the 80-Hz mark to the outputs for the main loudspeakers.

3.1.2 Multichannel surround setup

Fig. 3.2: Wiring example for a surround system

Surround system with a decoder:

If you want to integrate the B2092A into a 5.1 loudspeaker system that is coupled to a surround decoder (DTS® or Dolby Digital®), connect the decoder LFE output to the SUB input on your B2092A. The signals of a LFE channel (LFE = Low Frequency Effect or Low Frequency Enhanced) may contain frequencies of up to 120 Hz. However, since the B2092A does not reproduce signals above the 80-Hz mark, the LFE signals are passed onto the CENTER output and are then reproduced on the center loudspeaker. This way, these important signal segments are not lost. This is of particularly high value when using the B2092A as a studio monitor, because this way undesirable noise and distortion in this frequency range can be kept under control. Wire the remaining active loudspeakers as shown in the illustration.

Surround system without decoder:

You can create a surround system even without using a surround decoder, for example as a multichannel monitor system at your sound studio or for specific surround installations. The surround channels are reproduced using a single output of a mixing console, a surround monitor controller or using the separately recorded channels of a multitrack recorder.

Connect the output of the front left channel to the LEFT IN connector on the B2092A; connect the output of the front right channel to the RIGHT IN connector. Connect the center channel output to CENTER IN. If the surround mix has no separate subwoofer channel, the signal for this channel is created using the bass segments of the left, center and right channels.

Now, connect the left (active) front loudspeaker to LEFT OUT. Connect CENTER OUT to the center speaker and RIGHT OUT to the right speaker. All additional surround speakers (Left Surround

=LS, Right Surround = RS) are connected directly to the corresponding outputs on your system.

If you wish to use passive loudspeakers, connect the individual surround channels of your system to the power amp inputs of the corresponding surround speakers.

3.2 Input signal level adjustment

If the loudspeaker system is correctly wired and powered on, you can bring up the control room output of your mixing console or the volume controls of your decoder. If a signal source is connected, you can hear your B2092A for the first time. To obtain well-balanced sound, you only have to adjust the input sensitivity of your subwoofer. The default INPUT TRIM control setting is 0 dB. To adjust the signal level to the main speakers, values from -6 dB to +6 dB can be selected using this control.

LIMIT LED lights up as soon as one of the internal overload circuits springs into action. By the way, no damage is caused to your B2092A if the LIMIT LED briefly lights up during operation (when signal peaks occur). However, you should try to avoid the LIMIT LED lighting up for prolonged periods of time (in that case, after a while the thermal fuse is activated, and the internal power amplifier is switched off for a while). This is a sure sign that your B2092A is overloading. Lower the input signal level either on your mixing console or by using the INPUT TRIM control.

+The B2092A is capable of producing high volume levels. You should mix your recordings at moderate levels to avoid listening fatigue and hearing impairment.

3.3 Correct placement

Bass frequencies, due to their long wavelengths and undirected (spherical) dispersion pattern, can not be physically located as a sound source. Many people take this to mean that you can place the subwoofer wherever you want. However, this is not true. Placement of the subwoofer in a room has an important influence on the overall loudspeaker sound. Even minor changes in the placement of the subwoofer can make a big difference.

Each room has its own sonic characteristics, which differ based on room volume and the length ratio of the walls to the ceiling. Even the material and the composition of surfaces play a big role. Specific acoustic characteristic result from these influences, and they must be taken into consideration.

Certain frequencies sometimes create stationary waves between parallel room walls. The frequencies of these stationary walls correspond to the room’s resonance, and are determined by the room’s dimensions. If the room resonance is influenced by the subwoofer, this frequency gets especially loud in certain places in the room, while it cannot be heard at all in others—this is caused by stationary increases and cancellations. This phenomenon is especially pronounced with low frequencies, and can be rather unpleasant. We recommend first finding the position in which the subwoofer achieves the best results without

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