Behringer 1273 Guia De Inicio Rapido página 10

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1273
5. Connectors
To ensure the correct and reliable operation of the equipment, only high-quality balanced, screened, twisted pair audio cable should be
used. XLR and 1/4" connector shells should be of metal construction so that they provide a screen when connected to the console/snake
and, where appropriate, they should have pin 1 connected to the cable screen.
Line output audio connector. Female XLR plug and male XLR chassis connector with the following pinouts:
1 = ground; 2 = hot; and 3 = cold.
Balanced line input audio connector. Male XLR plug and female XLR chassis connector with the following pinouts:
1 = ground; 2 = hot; and 3 = cold.
Balanced line input/output audio connector. Male TRS plug to female. TRS chassis connector with the following pinouts:
1/Sleeve = ground; 2/Tip = hot (+); and 3/Ring = cold (-).
Unbalanced line input/output audio connector. Male TS plug to female. TRS chassis connector with the following pinouts:
2, 3/Sleeve = ground/cold (-); and 1/Tip = hot (+).
6. Operation
The 1273 is a dual channel pre-amp and equalizer. It can be used to pull various different classic tones from the sources connected. 48 V
is switched independently per channel to allow microphones and DI boxes to be used that require 48 V for operation. The preamp can
be overdriven using the GAIN control to pull out rich harmonic distortion from the source input which can be pleasing to the ears. In this
case, the output level can be brought back to manageable levels by reducing the LEVEL control.
The TONE button changes the input impedance for the mic input (1200/300 Ω). The sound will become a little warmer when 300 is
selected (pushed in), which may suit ribbon mics better.
The instrument input impedance is 600 kΩ. The input transformer is also in the instrument path, therefore when the tone button is used
there is a gentle warming effect which can be pleasing on bass and guitars where the tone is a little thin.
The unbalanced insert point allows other external equipment to be placed in the signal chain before the EQ such as a compressor.
This is useful when tracking sources and a good way to increase headroom when recording.
The HI-PASS can be used to remove excess rumble from the signal if required and is still active if the EQ is switched out of circuit.
The EQ section provides a Low Shelf function (cut or boost all frequencies the same adjustable amount below the selected frequency),
a High Shelf function (cut or boost all frequencies the same adjustable amount above the selected frequency), and a Mid Cut/Boost which
applies a "bell curve" cut or boost at the selected frequency.
The front and rear XLR and line inputs for each input should not be used at the same time.
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Quick Start Guide