Lectrosonics DSP4/4 User manual

DSP4/4
4 In / 4 Out Digital Audio Processor
DSP4/4 DUAL
Dual 4 In / 4 Out Digital Audio Processor
LECTROSONICS, INC.
Rio Rancho, NM
www.lectrosonics.com
OPERATING INSTRUCTIONS
and trouble-shooting guide

2
TABLE OF CONTENTS
INTRODUCTION .................................................................................................. 2
GENERAL TECHNICAL DESCRIPTION ............................................................ 3
INSTALLATION ..................................................................................................... 4
FRONT PANEL DESCRIPTION........................................................................... 5
REAR PANEL DESCRIPTION ............................................................................. 5
DIFFERENCES BETWEEN THE DSP4/4 AND DSP4/4 DUAL ......................... 6
OPERATING INSTRUCTIONS ............................................................................ 7
DSP4/4 CONTROL PANEL SOFTWARE ............................................................ 9
SOFTWARE CONTROL PANEL SCREENS AND FUNCTIONS ..................... 11
USING THE DSP4/4 TO IMPLEMENT AN ELECTRONIC CROSSOVER....... 24
SERIAL CABLE WIRING DIAGRAM ................................................................ 26
AMX CABLE WIRING DIAGRAM ...................................................................... 25
SERIAL PORT COMMANDS AVAILABLE ........................................................ 27
TROUBLESHOOTING ....................................................................................... 30
SPECIFICATIONS .............................................................................................. 31
FCC PART 15 NOTICE ...................................................................................... 31
SERVICE AND REPAIR ..................................................................................... 32
RETURNING UNITS FOR REPAIR ................................................................... 32
WARRANTY ......................................................................................... Back cover
INTRODUCTION
The DSP4/4 offers some of the most versatile multi-channel signal processing
available. With 4 channels of audio signal processing plus Automatic Digital Feed-
back Elimination (ADFE) on each channel, the DSP4/4 is a compact solution for a
wide variety of sound system applications. 8 nonvolatile preset memory positions
mean complete flexibility and reconfigurability.
Individual level control is provided on each input with gain adjustable in 1 dB steps
from -40 to +20 dB. A complete 4 x 4 matrix follows, allowing crosspoint gain to be
adjusted in 1 dB steps from -20 to +10 dB. Each output also includes gain adjust-
ment in 1 dB steps from -40 to +20 dB, with up to 12 signal processing filters. The
filters include a unique ADFE (automatic digital feefback eliminator), shelving,
parametric EQ, compression, limiting and digital delay.
Programmable pin connections on the rear panel allow configuring external level
controls and preset recall functions with simple switches and potentiometers. Any of
the 13 pins can be programmed as “inputs,” which can be used for individual or
grouped channel level control. 8 of the 13 pins can also be programmed as “out-
puts,” used to trigger external indicators or other functions.
The DSP4/4 has an RS-232 port for remote setup or control by a computer or other
RS-232 compatible controller.

3
4 In / 4 Out Digital Audio Processor
Rio Rancho, NM – USA
GENERAL TECHNICAL DESCRIPTION
The DSP4/4 is a 4in/4out audio signal processor that uses a state-of-the-art 32-bit floating point DSP (digital signal
processor). The unit provides powerful and flexible audio processing for all types of sound systems. Superior audio
quality is ensured by the use of 24-bit A/D and D/A converters.
The ADFE system on the DSP4/4 can find and eliminate feedback on each of the four outputs individually, allowing
multi-channel distributed sound systems to have the benefit of ADFE economically. The ADFE system works by
detecting feedback frequencies in the range of 100Hz to 5.6kHz. It places a 1/5 octave notch filter on the offending
frequency with 1/10 octave accuracy. The initial notch depth is 6dB, but is changed to 12dB if the same frequency is
still found to be feeding back.
Figure 1 shows the simplified block diagram of one channel of the DSP4/4. The gain for each input is individually
controlled. Following the input gain control is a 4 x 4 matrix with fully adjustable crosspoint gains. Each of the four
matrix outputs has a complement of 12 user-adjustable filters, a full function compressor, a limiter, audio delay, and
individual output gain control.
13 programmable pin connections on the rear panel allow control of a variety of functions on the DSP4/4. Set up as
“inputs,” external pots or switches can be connected to provide input and output muting and/or level control, or used
to recall of any of the 8 available preset memories. 8 of the 13 pins can also be programmed as “outputs,” which are
used to drive external indicators to signal the state of a programmable input. For example, a programmable output
can be used to light an LED as an indication of whether an output is muted or unmuted.
An RS-232 port is available to allow almost all of the functions of the DSP4/4 to be controlled either by a computer or
a dedicated control system (such as AMX or Crestron systems).
Input Channel (1 of 4)
Matrix Crosspoint
(1 of 16)
Filters/ADFE
(12/output)
Compressor
Balanced Input
Rear Panel
0dB to -30dB, Off
Input Gain
+10dB to -68dB, Off
+10dB to -20dB
and Off
12 Filters +
ADFE
Limiter Audio Delay Output Channel (1 of 4)
Output Gain
0dB to -78dB, Off
Rear Panel
0dB to -30dB, Off
To Balanced
Output Driver
Audio Delay
Limiter
Compressor
DSP4/4 Functional Block Diagram

4
LED is on when the programmable output is active
+5VDC (from Pin 14)
380
Ohms
Programmable Output Pin
380
Ohm
s
LED is off when programmable output is active
+5VDC (from Pin 14)
Programmable Output Pin
GND (from Pin 15)
Relay is on when programmable output is active
Programmable Output Pin
GND (from Pin 15)
Relay Coil
Coil current < 100mA 1N4001
or equiv. External DC Voltage
Source (<40VDC)
INSTALLATION
DSP4/4 Audio Inputs
Each of the four DSP4/4 inputs is balanced. The drawing
shows a typical interface between an unbalanced line
level source and the DSP4/4, and a balanced line level
source and the DSP4/4.
DSP4/4 Audio Outputs
Each of the four DSP4/4 outputs is balanced. To use an output in the unbalanced line level mode, take the signal
from the “+”output connection and the output ground. Leave the “-”output floating.
DSP4/4 Programmable Inputs
The DSP4/4 has 13 programmable inputs which can control a variety of DSP4/4 parameters. Each input can re-
spond to either a contact closure or a continuous voltage. The diagram below shows common connections to the
programmable input pins.
Each programmable input is internally pulled up through a 100K resistor to +5V, so no external pull up resistors are
necessary. When using a continuous voltage with one of the programmable inputs, the Function of the program-
mable input must be set to either Analog In Control or Analog Out Control. See the Programmable I/O tab for setting
all programmable input parameters.
DSP4/4 Programmable Outputs
The DSP4/4 has 8 programmable outputs which can indicate the current state of a programmable input. Each
programmable output is the electrical equivalent of a contact closure to ground. When a programmable output is
active , it conducts current to ground. When the programmable output is inactive , no current flows to ground. The
maximum usable voltage for the programmable outputs is 40V, and they will safely conduct up to 100mA DC continu-
ous. The following diagram shows some typical uses for the programmable outputs:
It is permissible to run LEDs from the +5VDC pins on the programmable input connector, as long as the total LED
current for all LEDS on does not exceed 100mA. Similarly, 5V relay coils may also be run from the +5VDC pins on
the programmable input
connector, as long as the
total coil current for all
relays on does not exceed
100mA. Note that the
diagram shows an external
DC source powering the
relay coil. This will be
necessary if coil voltages
above 5V are needed.
Unbalanced Line Level Source
Input +
Input -
Gnd
Input +
Input -
Gnd
Balanced Line Level Source
Pot Connection for Analog Control of Gain
10K Linear Pot
CCW CW +5V
To Programmable Input Pin
Gnd
Contact Closure as Programmable Input
To Programmable Input Pin
Gnd
DC Voltage Source as Programmable Inpu
t
To Programmable Input Pin
0VDC (Off) to +5VDC (On)
Gnd

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 –6Clip Signal
Present
–12 –6Clip Signal
Present
–12 –6Clip Signal
Present
–12 –6Clip
RESET
DEFAULTS
+
–– + + –– +
43 21
OUTPUTS
+
–– + + –– +
43 21
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 –6Clip Signal
Present
–12 –6Clip Signal
Present
–12 –6Clip Signal
Present
–12 –6Clip
INPUT 1B INPUT 2B INPUT 3B INPUT 4B
Signal
Present
–12 –6Clip Signal
Present
–12 –6Clip Signal
Present
–12 –6Clip Signal
Present
–12 –6Clip
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

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PROGRAMMABLE OUTPUTS - 8 of the 13 programmable pins can be configured to work as “outputs,”which are
used to indicate the state of a programmable input. For example, an LED can be driven from one of these output
pins to indicate activity at one of the audio inputs. Each of the 8 programmable outputs is the electronic equivalent of
a contact closure. The logic output will sink up to 100mA at voltages up to 40VDC, however, the total current draw of
all logic outputs should not exceed 100mA if the internal +5V supply in the DSP4/4 is used.
RS-232 SERIAL PORT - Provides access to and control of some of the operational features of the DSP4/4. The port
is compatible with the serial port of a PC, or other controllers with RS-232 type serial ports. For hardware intercon-
nection and software details, see Appendix 1, “Serial Port Hardware and Software”.
EXPANSION IN/OUT - Allows other LecNet devices to be connected to the DSP4/4. Also used when multiple DSP4/
4s are connected together to bus the RS-232 serial connection between DSP4/4s.
Pin Expansion In Function Expansion Out Function
1 Main In Main Out
2 Mix Minus Out Mix Minus In
3 NOM In NOM Out
4 NOM Total NOM Total
5 RS-232 RX RS-232 RX
6 RS-232 TX RS-232 TX
7 round round
8 N/C N/C
PWR IN - Connects to the CH40 (for the DSP4/4) or the PS60 (for the DSP4/4 DUAL) power supply to provide power
for the unit.
DIFFERENCES BETWEEN THE DSP4/4 AND THE DSP4/4 Dual
The DSP4/4 Dual is simply two DSP4/4s in one box sharing a common power supply. Audio inputs and outputs are
labeled 1A through 4A on one unit and and 1B through 4B on the other unit. There are no internal bus connections
between the A and B units. Each unit operates as an independent device with a unique serial address. The follow-
ing outlines the important differences between the DSP4/4 ad the DSP4/4 Dual.
LecNet Port and LecNet Address
A DSP4/4 has a single LecNet address whose factory default is 143. A DSP4/4 Dual has two LecNet addresses
whose factory defaults are 143 (for channels 1A-4A) and 144 (for channels 1B-4B). Both addresses for the DSP4/4
Dual are accessible from the LecNet port on the DSP4/4 Dual.
Programmable Inputs and Outputs
The DSP4/4 Dual has two 15 pin D-sub connectors for the programmable input/output function. Each of the connec-
tors controls only the four channels with which it is associated. For example, assume a programmable input is set
for the preset recall function. In order to recall a preset for all eight channels of the DSP4/4 Dual, the programmable
inputs should be at both LecNet addresses should be set to the recall preset function. In addition, the contact
closure to ground to effect the preset recall should be electrically connected to the programmable inputs on both
connectors.
Power Supply
The DSP4/4 uses a Lectrosonics CH40 power supply. The DSP4/4 Dual uses the Lectrosonics PS60 power supply.
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
OUT IN
EXPANSION

7
4 In / 4 Out Digital Audio Processor
Rio Rancho, NM –USA
OPERATING INSTRUCTIONS
Since all of the parameters used to set up the DSP4/4 are adjusted using the DSP4/4 Software Control Panel, the
operating instructions include instructions for the use of the software. It is recommended that you have the software
running, either live or in the demo mode, as you read through this section.
Using the DSP4/4 PC Hosted Control Panel
The DSP4/4 control panel may be used in one of two ways. When launched from the LecNet Master Pro application,
you can control all the parameters of the DSP4/4 in real time. Needless to say, your PC must be connected to the
DSP4/4 using the supplied LecNet serial cable in order for this to happen. Alternatively, you can launch the DSP4/4
control panel directly and it will automatically come up in the demo mode. The demo mode is useful for doing system
setup (and saving the setups to a disk file) without the need to be connected to a DSP4/4.
System setup and audio signal flow follows the order of the tabs on the control panel from left to right. Start at the
left tab and work your way to the right Please refer to the DSP4/4 Control Panel Software section of this manual for
a complete description of each control panel tab.
The DSP4/4 Block Diagram on page 3 represents the signal flow of one input to one output through one matrix
crosspoint. Illustrated are all the gain control points in the signal path.
To adjust this parameter: Use this control:
Input Gain Input gain tab on DSP4/4 control panel software
Rear Panel (Input) Gain Programmable inputs on DSP4/4 rear panel
Crosspoint Matrix Gain Crosspoint Matrix tab on DSP4/4 control panel software
Output Gain Output gain tab on DSP4/4 control panel software
Rear Panel (Output) Gain Programmable outputs on DSP4/4 rear panel
Each input channel has two gain control points. The input control point labeled “Input Gain”is adjusted using the
Input Gain tab on the DSP4/4 control panel. This control is used to adjust the sensitivity of each line level input to
the desired gain. The gain adjustment range is +10dB to -68dB plus off.
The input control point labeled “Rear Panel”represents the gain adjustments which can be made from the rear panel
programmable inputs. The rear panel gain control is attenuation only, starting at a maximum gain of 0dB. The rear
panel input gain controls may be limited in their adjustment range using the Input Gain tab on the DSP4/4 control
panel. In addition, you may set a rear panel preset gain value that will be applied to any inputs which are being
controlled by a programmable input. The preset gain is applied at power up. Note that if there are no limits applied
to the rear panel gain range, the input channel may be turned completely off. The current gain value of the rear
panel controls is displayed on the Input Gain tab.
Matrix crosspoint gain can be set using the Matrix tab. Input-to-output gains are set based on the requirements of
the application. The factory default matrix setting is In1 to Out1, In2 to Out2, In3 to Out3, and In4 to Out4, all at 0dB
crosspoint gain.
System equalization and feedback control are manipulated in the Filter Setup tab. The frequency response of the
sound system is adjusted with parametric filters, followed by an automatic digital feedback elimination (ADFE)
process that uses narrowband notch filters. The equalization should be set first, then several ADFE filters as follows.
Normally, several filters (2 to 4) are set to the ADFE function and deployed to notch out the worst feedback frequen-
cies in the room, and then the setup is stored into memory. Any time the setup is stored into the DSP4/4 memory or
to disk, the frequency of any ADFE filter that has been deployed will also be stored. To deploy the filter (or “ring out”
the system), gradually raise the volume of the sound system using the ADFE Setup window in the computer screen
control panel. When feedback begins to occur, the DSP4/4 will automatically detect it and set a notch filter to cancel
it. Continue to increase the volume until the next feedback frequency is detected and the next filter is deployed, and
so on. After all the designated ADFE filters have been deployed, store the settings to memory or disk to preserve
the frequency setting on each filter. These filters will then operate at these fixed frequencies every time the system is
powered up. If the volume has been increased the full 10dB allowed in the window on the screen and no further
feedback occurs, the system is likely to be very stable and not need any additional filters.

8
It is also normal practice to then set two or so additional filters as ADFE types, but not deploy them before the setup
is stored to memory. These two filters will then function as dynamic feedback elimination and be available to notch
out any new feedback frequencies that might occur during subsequent operation. After a filter is deployed to notch
out feedback, it will remain on that frequency until the DSP4/4 is powered down. At the next power up, the filter will
again be available to be deployed as any other feedback occurs.
Set up the sound system so everything is operating normally. Refer to pages 12-13 and follow the summary below to
use the ADFE system.
1) Start with the ADFE system off for all outputs, using the ADFE On/Off radio buttons;
2) Click on the ADFE Setup main menu item to bring up the ADFE Setup window;
3) Using the Out1 - Out4 radio buttons on the Filter Setup tab, select Out 1;
4) Assign as many ADFE notch filters as you want for fixed room modes (typically two or three). This is done by
clicking on the gain label (above the scroll bar) on an unassigned filter, then using the Filter Type dropdown
list to pick ADFE Notch;
5) Using the ADFE On/Off radio buttons, set the ADFE system On for Out 1;
6) Using the Output Gain scroll bar on the ADFE Setup window, raise the system gain until feedback occurs;
7) Wait for a notch to be placed on the offending frequency (usually within one or two seconds), and then
increase the gain again until feedback again occurs;
8) Repeat step 7 until all the ADFE filters you have assigned have been deployed;
9) Turn the ADFE system Off using the ADFE On/Off radio buttons;
10) If you want any dynamic ADFE notch filters, assign them now as in step 4 above;
11) Repeat steps 1-10 for the other outputs;
12) After all outputs are rung out and the system is functioning normally, turn the ADFE system On for all outputs
using the ADFE On/Off radio buttons;
13) Save the active state of the DSP4/4 to preset 1 (the power up default) to preserve the frequencies of the
ADFE filters using the Save Active Setup to DSP4/4 Preset... File menu option.
The compressor may be set up using the Compressor tab. Compression can be used to restrict the dynamic range
of the audio source without crushing the life out of it. Several options exist for compression ratio from light compres-
sion (1.5:1) to fairly heavy compression (5:1). Lower values of compression ratio will be less audible in their com-
pression action, but will exert less dynamic control. Some tinkering with compression ratio and threshold will be
necessary in any given venue to optimize the compressor. The default attack and release times are generally good
places to start, and indeed may not need to be adjusted at all. The maximum gain reduction that can be exerted by
the compressor under any circumstance is 25dB.
The limiter may be set up using the Limiter tab. Limiting is used to protect power amplifiers, loudspeakers, and any
other downstream equipment from overload. The limiter has a compression ratio of “infinity-to-one”above threshold.
This means that the threshold setting constitutes a ceiling for the audio signal. The limiter threshold is generally set
higher than the compressor threshold at a level that provides system protection.
When audio delay is necessary in a system, use the Audio Delay tab for set up. Delay can be added to any of the
four outputs up to 182.625mS, in 20.83uS increments. The delay is displayed in milliseconds, feet and meters. In
addition, on the right side of the tab is a Time/Distance calculator which will convert any of the three quantities
entered to the other two.
The output gain structure is identical to the input gain structure, with the exception that the output gain range is 0dB
to -78dB plus off. The output gain is adjusted using the Output Gain tab. Rear panel output gain control ranges may
be set in a similar fashion to the input control ranges in the Output Gain tab.

9
4 In / 4 Out Digital Audio Processor
Rio Rancho, NM –USA
DSP4/4 CONTROL PANEL SOFTWARE
The following section is a description of the File menu and each of the tabs in the DSP4/4 Control Panel application.
File Menu Options
Copy Preset(s) to DSP4/4 from Disk File... - Allows any preset stored to a disk file (.dsd file extension) to be
loaded to the corresponding DSP4/4 memory preset. The Preset 1 through Preset 8 selections copy a single preset,
while the All Presets selection copies all 8 presets to the DSP4/4. After a preset is loaded to the DSP4/4, it will be
transferred to the active DSP4/4 setup. If all 8 presets are loaded, preset 1 will be made the active preset. This
option is helpful in restoring DSP4/4 settings if they have been accidentally corrupted. Note that this option will
overwrite any data stored in the DSP4/4’s preset memory with the new preset data from disk.
Save Preset(s) from DSP4/4 to Disk File... - Allows any preset currently stored in the DSP4/4’s preset memory to
be saved to a disk file. The Preset 1 through Preset 8 selections copy a single preset, while the All Presets selection
copies all 8 DSP4/4 presets to the selected disk file. This option is used to copy the Preset parameters to an exter-
nal disk file for archiving the final settings for the DSP4/4 in a particular installation.
Load Active Setup from Disk File... - Allows the active DSP4/4 setup to be loaded from a disk file. Loading the
active DSP4/4 setup from a disk file will not overwrite any DSP4/4 preset memory data. This option is helpful when a
basic DSP4/4 setup has been generated off-site and needs to be “tweaked”on-site.
Save Active Setup to Disk File... - Allows the active DSP4/4 setup to be stored to a disk file. You select which
preset position in the disk file to which to store the active DSP4/4 setup. This option has no effect on the DSP4/4
preset memories.
Select Active Setup from DSP4/4 Preset... - Allows any of the DSP4/4 preset memories to be recalled and made to
be the active DSP4/4 setup. This option does not affect any of the preset memory data.
Save Active Setup to DSP4/4 Preset... - Allows the active DSP4/4 setup to be stored in one of the 8 preset memo-
ries in the DSP4/4. Note that this option will overwrite any preset memory data stored in the selected preset memory
position.
Enter Input/Output Names... - Allows names to be assigned to the 4 inputs and the 4 outputs of the DSP4/4. These
names may be up to 15 characters long and are stored in nonvolatile memory in the DSP4/4. In addition, the names
are stored in any disk files generated with any of the save to disk options above. Inputs or outputs with no assigned
names are listed as “No Name”. To change a name, simply click on the desired text box and enter the desired name.
While you are permitted to enter more than 15 characters in the text box, only the first 15 will be stored. To save the
changes to the DSP4/4’s nonvolatile memory, click the Apply button. If you click the Cancel button, the changes you
have made will not be applied. The shortcut key for this option is Ctrl+E.
Enter Disk File Notes... - Allows you to add any notes that you want to be included in a file saved to disk. These
notes could be installation instructions, operational instructions, names, dates or any other information which might
be helpful to associate with a saved file.
After you enter the desired text into the text box, choose OK to save the changes you’ve made. Cancel will ignore
the changes you’ve made since the last time you clicked OK. Note that to save your changes to a disk file, you must
still either use Save Preset(s) from DSP4/4 to Disk File... or Save Active Setup to Disk File... to store the notes in a
disk file. The shortcut key for this option is Ctrl+D.
Print Setup... - Allows the active printer to be changed using the standard Windows printer setup dialog. This will
set the printer which is used with the Print Tabs... menu selection. The shortcut key for this option is Ctrl+P.
Print Tabs... - Allows any or all of the DSP4/4 control panel tabs to be printed for documentation purposes.
Update DSP4/4 Firmware from Disk File - Allows newer firmware revisions to be loaded into the DSP4/4. From
time to time, new features or bug fixes will be added to the DSP4/4’s firmware. These changes will be distributed
with the LecNet installation disks and available on the Lectrosonics Web site (www.lectrosonics.com). The firmware
file will have a “.s19”extension. When installing from the installation disks, the firmware files will automatically be
placed in the LecNet directory (default: c:\lecnet). If new firmware is downloaded from the Web site, the file should
be placed in the LecNet directory. Anytime the DSP4/4 Control Panel is run, it will check for .s19 firmware files which
are more recent than the firmware revision in the DSP4/4. You will be alerted that the DSP4/4’s firmware can be
updated, and you can select whether or not to let the update proceed. If no firmware file is available in the LecNet
directory which is newer than the DSP4/4 firmware, this option will be disabled. The shortcut key for this option is
Ctrl+U.

10
Update DSP4/4 DSP Software from Disk File - Allows newer DSP software revisions to be loaded into the DSP4/4.
From time to time, new features or bug fixes will be added to the DSP4/4’s DSP software. These changes will be
distributed with the LecNet installation disks and available on the Lectrosonics Web site (www.lectrosonics.com).
The DSP software file will have a “.cnv”extension. When installing from the installation disks, the DSP software files
will automatically be placed in the LecNet directory (default: c:\lecnet). If new DSP software is downloaded from the
Web site, the file should be placed in the LecNet directory. Anytime the DSP4/4 Control Panel is run, it will check for
.cnv DSP software files which are more recent than the DSP software revision in the DSP4/4. You will be alerted that
the DSP4/4’s DSP software can be updated, and you can select whether or not to let the update proceed. If no DSP
software file is available in the LecNet directory which is newer than the DSP4/4 DSP software, this option will be
disabled. The shortcut key for this option is Ctrl+T.
Exit - Ends the application. The shortcut key for this option is Ctrl+X.