5
4 In / 4 Out Digital Audio Processor
Rio Rancho, NM – USA
FRONT PANEL DESCRIPTION
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.
REAR PANEL DESCRIPTION
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.
4 IN / 4 OUT DIGITAL AUDIO PROCESSOR
RIO RANCHO, NM – USA
POWER
INPUT 1
INPUT 2
INPUT 3
INPUT 4
Signal
Present
–12 –6 Clip
Signal
Present
–12 –6 Clip
Signal
Present
–12 –6 Clip
Signal
Present
–12 –6 Clip
RESET
DEFAULTS
+
–
– +
+
–
– +
4
3
2
1
OUTPUTS
+
–
– +
+
–
– +
4
3
2
1
INPUTS
PWR
IN
(CH40)
OUT
IN
20 VAC
LecNet
(RS232)
EXPANSION
PROGRAMMABLE
INPUTS / OUTPUTS
1
15
8
9
1 - Prog I/O 1
2 - Prog I/O 2
3 - Prog I/O 3
4 - Prog I/O 4
5 - Prog I/O 5
6 - Prog I/O 6
7 - Prog I/O 7
8 - Prog I/O 8
9 - Prog IN 9
10 - Prog IN 10
11 - Prog IN 11
12 - Prog IN 12
13 - Prog IN 13
14 - +5V
15 - GND
POWER
INPUT 1A
INPUT 2A
INPUT 3A
INPUT 4A
Signal
Present
–12 –6 Clip
Signal
Present
–12 –6 Clip
Signal
Present
–12 –6 Clip
Signal
Present
–12 –6 Clip
INPUT 1B
INPUT 2B
INPUT 3B
INPUT 4B
Signal
Present
–12 –6 Clip
Signal
Present
–12 –6 Clip
Signal
Present
–12 –6 Clip
Signal
Present
–12 –6 Clip
DUAL 4 IN / 4 OUT DIGITAL AUDIO PROCESSOR
RIO RANCHO, NM – USA
RESET
DEFAULTS
RESET
DEFAULTS
+
–
– +
+
–
– +
4A
3A
2A
1A
OUTPUTS
+
–
– +
+
–
– +
4A
3A
2A
1A
INPUTS
PWR
IN
(PS60)
OUT
IN
16.5 VAC
LecNet
(RS232)
EXPANSION
PROGRAMMABLE
INPUTS / OUTPUTS
1
15
8
9
1 - Prog I/O 1
2 - Prog I/O 2
3 - Prog I/O 3
4 - Prog I/O 4
5 - Prog I/O 5
6 - Prog I/O 6
7 - Prog I/O 7
8 - Prog I/O 8
9 - Prog IN 9
10 - Prog IN 10
11 - Prog IN 11
12 - Prog IN 12
13 - Prog IN 13
14 - +5V
15 - GND
+
–
– +
+
–
– +
4B
3B
2B
1B
OUTPUTS
+
–
– +
+
–
– +
4B
3B
2B
1B
INPUTS
PROGRAMMABLE
INPUTS / OUTPUTS
PROCESSOR A
PROCESSOR B
