Front Panel Description; Rear Panel Description; Operating Instructions - Lectrosonics DA4 Operating Instructions Manual

FRONT PANEL DESCRIPTION

OUTPUT LEVEL (1-4) - Controls the output level for
each output. These controls are non-interactive, so all
output levels are completely independent.

REAR PANEL DESCRIPTION

INPUT - Accepts a balanced (or unbalanced) input to
the module.
THROUGH OUTPUT - Provides an output which is
parallel to the input for passing the input signal on to
other Modular Audio Processor modules, if desired.
Note that since the Through Output is directly in parallel
with the input, if an unbalanced input is used, the
Through Output signal will be unbalanced also.
OUTPUT (1-4) - Provides low impedance balanced
outputs to drive long lines.

OPERATING INSTRUCTIONS

Operation of the DA4 is quite straightforward. A
balanced or unbalanced signal is supplied to the input
XLR connector. If an unbalanced signal is used, pin 2
("+") should be connected to the signal or "hot"
conductor of the input signal, and pins 1 and 3 should
be connected together and also connected to the
ground conductor of the input signal. Note that this will
make the Through Output unbalanced as well.
With an input signal properly connected, adjust the
Output level controls for the desired output level.
The output impedance of the drivers is low (40 ohms
balanced) to provide wide band performance over long
cable runs. For instance, with a cable capacitance of
30 pico-farads/foot, the outputs can drive well over a
mile of cable and still provide frequency response to
20KHz. The formula for calculating the maximum
cable run which will still pass signal frequencies to
20KHz is given below:
CC = Cable capacitance/foot
Max Cable Length = ----------------------­
5,026,000 * CC
1
3
4
2
0
1
1
LEVEL
3
4
2
0
2
1
LEVEL
3
4
2
0
3
1
LEVEL
3
4
2
0
4
1
LEVEL
DA 4
DISTRIBUTION
AMPLIFIER
FRONT
Figure 2 - DA4 FRONT & REAR PANELS
3
INPUT
1 2
3
THRU
2 1
3
2 1
1
3
2 1
2
3
2 1
3
3
2 1
4
3
DA 4
AUDIO DISTRIBUTION AMPLIFIER
REAR