Front Panel Description; Rear Panel Description - Lectrosonics DSP4/4 DUAL Operating Instructions And Troubleshooting Manual

RIO RANCHO, NM – USA
RIO RANCHO, NM – USA
INPUT 1B
Signal –12 –6 Clip
Present Present
INPUT LEVEL 1-4 (1A-4A on the single version and 1B-4B on the dual version) – Indicates the audio input level
of each input. The green Signal Present LED indicates an audio level of at least –20dBu is present. The green –12
LED indicates 12dB of headroom before the maximum input level is reached. This is equivalent to an audio level of
+8dBu. The yellow –6 LED indicates 6dB of headroom before the maximum input level is reached. This is equivalent
to an audio level of +14dBu. The red Clip LED indicates 0dB of headroom, i.e. the input is overloaded and clipping.
This is equivalent to an audio level of +20dBu.
RESET DEFAULTS – When held down during power-up, resets the preset memories to their factory defaults. Note
that this will overwrite any user information which may have been stored in the preset memories.
PWR
IN
EXPANSION
(CH40)
LecNet
IN
OUT
20 VAC (RS232)
PWR
IN
EXPANSION
(PS60)
LecNet
OUT IN
16.5 VAC (RS232)
INPUTS 1A-4A (and 1B-4B on the Dual) - Accepts balanced or unbalanced signal. Fully balanced differential input,
RF filtered.
OUTPUTS 1A-4A (and 1B-4B on the Dual) - Provide balanced system outputs. The Line Outputs may also be used
in an unbalanced mode by connecting the "+" terminal of the Line Output to the signal lead of the unbalanced device,
and the ground terminal of the Line Output to the ground of the unbalanced device. Do not ground the "-" terminal of
the Line Output.
PROGRAMMABLE INPUTS - Allows remote control of a number of DSP4/4 functions. Pins 1-8 on the 15 pin D-Sub
connector may be programmed to be either programmable inputs or programmable outputs. Pins 9-13 are program-
mable inputs only.
Each of the 13 programmable inputs can utilize either continuous DC voltages (0VDC-5VDC) or contact closures,
depending on the particular function chosen. For continuous voltages, either 10K ohm linear pot or an adjustable DC
control voltage may be used. The volume control action is internally scaled in software to provide an "audio taper"
characteristic to a linear pot. When using a DC control voltage, the control constant is .167V/dB (or 6dB/V) from 0V
to 5V. At 0V, the channel is turned completely off. The control voltage should not exceed 5V.

FRONT PANEL DESCRIPTION

4 IN / 4 OUT DIGITAL AUDIO PROCESSOR
DUAL 4 IN / 4 OUT DIGITAL AUDIO PROCESSOR
INPUT 2B INPUT 3B INPUT 4B
DEFAULTS
Signal –12 –6 Clip Signal –12 –6 Clip Signal –12 –6 Clip
Present Present

REAR PANEL DESCRIPTION

PROGRAMMABLE
OUTPUTS
INPUTS / OUTPUTS
4 3 2 1
– + – + – + – + – +
PROCESSOR A
PROGRAMMABLE
OUTPUTS
INPUTS / OUTPUTS
4A 3A 2A 1A
– + + – + + – +
– –
Rio Rancho, NM – USA
INPUT 1
Signal –12 –6 Clip
Present
RESET
INPUT 1A
Signal –12 –6 Clip
Present
1 - Prog I/O 1 6 - Prog I/O 6 11 - Prog IN 11
2 - Prog I/O 2 7 - Prog I/O 7 12 - Prog IN 12
INPUTS
3 - Prog I/O 3
8 - Prog I/O 8 13 - Prog IN 13
4 - Prog I/O 4 9 - Prog IN 9 14 - +5V
4 3 2 1
5 - Prog I/O 5 10 - Prog IN 10 15 - GND
– + – + – +
8 1
15 9
1 - Prog I/O 1 6 - Prog I/O 6 11 - Prog IN 11
2 - Prog I/O 2 7 - Prog I/O 7 12 - Prog IN 12
INPUTS 3 - Prog I/O 3 8 - Prog I/O 8 13 - Prog IN 13
4 - Prog I/O 4 9 - Prog IN 9 14 - +5V
5 - Prog I/O 5 10 - Prog IN 10 15 - GND
4A 3A 2A 1A
+ – + +
– –
8 1
15 9
4 In / 4 Out Digital Audio Processor
INPUT 2 INPUT 3 INPUT 4
Signal –12 –6 Clip Signal –12 –6 Clip Signal –12 –6 Clip
Present Present Present
INPUT 2A INPUT 3A INPUT 4A
Signal –12 –6 Clip Signal –12 –6 Clip Signal –12 –6 Clip
Present Present Present
PROCESSOR B
PROGRAMMABLE
OUTPUTS
INPUTS / OUTPUTS
4B 3B 2B
– + + – +
–
RESET
DEFAULTS
POWER
RESET
DEFAULTS
POWER
INPUTS
1B 4B 3B 2B 1B
+ – + + – + +
– – –
5