Lectrosonics SPNDNT Installation manual

SPNDNT
Network Processor
INSTALLATION AND STARTUP GUIDE
Rio Rancho, NM, USA
www.lectrosonics.com
Fill in for your records:
Serial Number:
Purchase Date:
A trademark of Audinate Pty Ltd.
IMPORTANT NOTICE:
Several settings are mandatory to ensure the
processor will connect and operate properly
with a network and other processors.
See page 11 for details.

ASPEN Digital Processor
LECTROSONICS, INC.
2

Installation and Quick Start Guide
Rio Rancho, NM 3
This symbol, wherever it appears, alerts
you to the presence of uninsulated danger-
ous voltage inside the enclosure -- voltage
that may be sufficient to constitute a risk of
shock.
This symbol, wherever it appears, alerts
you to important operating and mainte-
nance instructions in the accompanying
literature. Please read the manual.
When using your telephone equipment, basic safety
precautions should always be followed to reduce the
risk of fire, electrick shock and injury to persons, includ-
ing the following:
1) Read these instructions.
2) Keep these instructions.
3) Heed all warnings.
4) Follow all instructions.
5) Do not use this apparatus near water.
6) Clean only with a dry cloth.
7) Do not block any ventilation openings. Install in ac-
cordance with the manufacturer’s instructions.
8) Do not install near any heat sources such as radia-
tors, heat registers, stoves, or other apparatus
(including amplifiers) that produce heat.
9) Do not defeat the safety purpose of the polarized
or grounding-type plug. A polarized plug has two
blades with one wider than the other. A grounding
type plug has two blades and third grounding prong.
The wider blade or the third prong are provided
for your safety. If the provided plug does not fit into
your outlet, consult an electrician for replacement of
the obsolete outlet.
10) Protect the power cord from being walked on or
pinched particularly at plugs, convenience recepta-
cles, and the point where they exit from the appara-
tus.
11) Only use attachments/accessories specified by the
manufacturer.
12) Use only with the cart, stand, tri-
pod, bracket, or table specified by
the manufacturer, or sold with the
apparatus. When a cart is used,
use caution when moving the cart/
apparatus combination to avoid
injury from tip-over.
13) Unplug this apparatus during lightning storms or
when unused for long periods of time.
Important Safety Instructions
14) Refer all servicing to qualified service personnel.
Servicing is required when the apparatus has
been damaged in any way, such as power-supply
cord or plug is damaged, liquid has been spilled
or objects have fallen into the apparatus, the
apparatus has been exposed to rain or moisture,
does not operate normally, or has been dropped.
15) WARNING -- TO REDUCE THE RISK OF FIRE
OR ELECTRIC SHOCK, DO NOT EXPOSE THIS
APPARATUS TO RAIN OR MOISTURE.
16) The AC mains plug, or appliance coupler shall be
readily available to the operator as a means of
power disconnection, if applicable.
17) Unit shall be connected to a MAINS socket outlet
with a protective earthing connection.
18) Do not use this product near water for example,
near a bathtub, washbowl, kitchen sink or laundry
tub, in a wet basement or near a swimming pool.
19) Avoid using a telephone (other than a cordless
type) during an electrical storm. There may be a
remote risk of electric shock from lightning.
20) Do not use the telephone to report a gas leak in
the vicinity of the leak.
21) Use only the power cord and batteries indicated
in this manual. Do not dispose of batteries in a
fire. They may explode. Check with local codes for
possible special disposal instructions.
22) “CAUTION: To reduce the risk of fire, use only No.
26 AWG or larger (e.g., 24 AWG) UL Listed or
CSA Certified Telecommunication Line Cord”
SAVE THESE INSTRUCTIONS

ASPEN Digital Processor
LECTROSONICS, INC.
4
IMPORTANT NOTICE:
Several settings are mandatory to ensure the
processor will connect and operate properly
with a network and other processors.
See page 11 for details.
Table of Contents
IMPORTANT NOTICE: .................................................................................................................................................................. 1
Important Safety Instructions ........................................................................................................................................................ 3
IMPORTANT NOTICE: .................................................................................................................................................................. 4
Overview ....................................................................................................................................................................................... 5
What is Dante?.............................................................................................................................................................................. 5
The Role of the SPNDNT Processor............................................................................................................................................. 5
Switched and Redundant Modes .................................................................................................................................................. 5
Front Panel .................................................................................................................................................................................... 6
Rear Panel .................................................................................................................................................................................... 6
USB Driver Installation .................................................................................................................................................................. 7
ASPEN Software ........................................................................................................................................................................... 8
ASPEN Control Panel.................................................................................................................................................................... 8
ASPEN Software Installation......................................................................................................................................................... 8
Dante Software............................................................................................................................................................................ 10
Dante Controller .......................................................................................................................................................................... 10
DanteTM Software Installation ...................................................................................................................................................... 10
Mandatory Settings ..................................................................................................................................................................... 11
Hardware Connections................................................................................................................................................................ 12
Installing the chassis into a rack.................................................................................................................................................. 12
Connecting the Master for the First Time .................................................................................................................................... 12
Rear Panel .................................................................................................................................................................................. 12
Cabling Of Stacked Units ............................................................................................................................................................ 12
Front Panel USB Port .................................................................................................................................................................. 12
ASPEN RS-232 Port ................................................................................................................................................................... 13
Crestron®RS-232 Port Wiring ..................................................................................................................................................... 13
Programmable Inputs .................................................................................................................................................................. 13
Programmable Outputs ............................................................................................................................................................... 13
Network and PC Connections ..................................................................................................................................................... 14
System Setup Examples ............................................................................................................................................................. 16
Basic Configuration ..................................................................................................................................................................... 16
Using the AEC on Network Connections.................................................................................................................................... 18
Multiple Site Conferencing ......................................................................................................................................................... 22
Firmware Update Procedure ....................................................................................................................................................... 25
MCU Recovery from Interrupted Firmware Update Procedure ................................................................................................... 25
FCC Part 15 Compliance ............................................................................................................................................................ 26
Service and Repair...................................................................................................................................................................... 27
Returning Units for Repair........................................................................................................................................................... 27

Installation and Quick Start Guide
Rio Rancho, NM 5
Overview
What is Dante?
Audinate’s patent pending Dante™ technology is a
flexible Internet Protocol (IP) and Ethernet based
digital AV network technology that eliminates the many
bulky cables needed to provide point-to-point wiring for
analog AV installations.
With Dante, existing infrastructure can be used for
high performance audio as well as for ordinary control,
monitoring or business data traffic. Digital networks
utilize standard IP over Ethernet offering high band-
width capable of transporting hundreds of high quality
channels over Gigabit Ethernet.
Set-up and configuring the system is made easy as
well, saving enormous installation costs and long term
cost of ownership on a digital network. The physical
connecting point is irrelevant: audio signals can be
made available anywhere and everywhere. Patching
and routing now become logical functions configured
in software, not via physical wired links
The Role of the SPNDNT Processor
The SPNDNT acts as a node on the Dante digital au-
dio network, with 32 inputs and 32 outputs. SPNDNT
outputs are mapped to Dante transmit channels. Dante
receive channels are mapped to SPNDNT inputs,
which can be routed to mix busses in the ASPEN mix
matrix. All of the normal automatic mixing features are
available in the SPNDNT mix matrix. Gain control and
muting are available for the SPNDNT inputs (Dante
receive channels) and outputs (Dante transmit chan-
nels).
Switched and Redundant Modes
The rear panel Dante ports allow operation in a
switched mode through a single network using either
jack, or in a redundant mode through two separate
networks using both jacks simultaneously. Redundancy
is required in some applications where it is imperative
that no audio is lost due to network problems, such as
in courtroom recording. The secondary network dupli-
cates real-time audio traffic. If the primary network fails
for any reason, the secondary network’s audio contin-
ues without losing even a single sample.
See page 15 and also refer to the help files and
documentation provided by Audinate for more informa-
tion regarding the setup for switched and redundant
modes.
Audinate®is a registered trademark of Audinate Pty Ltd.

ASPEN Digital Processor
LECTROSONICS, INC.
6
Made In the USA
Front Panel
Headphone Monitor
Standard 1/4 inch jack and level control. Drives both
channels of stereo headphones.
MCU Recovery (recessed pushbutton)
Used in the procedure to recover from an interrupted
firmware update procedure. See section on Firmware
Update Procedure for details on usage.
Rear Panel
Programmable Input and Output Ports
Programmable inputs and outputs used to control
levels, settings, indicate the current state of a program-
mable input and control a variety of other parameters.
Serial Port
Used for control; typically with third party products
such as touch panel displays.
Ethernet Port
Used for control only. Does not pass audio.
POWER
Switch
USB Port Alert
LED
Headphone Monitor Comm
LED
Power
LED
USB Port
Standard USB connector for the setup and control
from a computer using Windows XP, Vista or Windows
7 operating system. The USB port is also used for
firmware updates.
Status LEDs
• Comm LED - indicates USB, RS-232 and network
communication
• Alert LED - blinks to indicate fault or error
• Alert LED - glows steady in firmware update mode
• Power LED - glows to indicate power ON
ASPEN Bus Data/Audio Ports
This gigabit bus transports audio and data from one
board to the next through CAT-6 cabling (maximum 2
meters or 6.5 ft length) and RJ-45 connectors. Proces-
sors are normally installed with the Master unit on top
and Slave units below it. The cabling is then connected
from the uppermost jack on one board to the lower-
most jack on the unit just above it.
Dante Ports
The network audio ports. Either port can be used with
a single network connection. When a second network
is configured for redundancy, all processors connected
to the network must have consistent connections, i.e.
all Primary ports connected to one network and all
Secondary ports connected to the other network.
Power Inlet RS232
Serial Port
Programmable Input
and Output Ports
Data/Audio
Bus Ports
Cooling Fan
Outlet
Ethernet
Port
Primary Secondary
Dante Ports
MCU Recovery

Installation and Quick Start Guide
Rio Rancho, NM 7
USB Driver Installation
The example shown here illustrates the installation
procedure using a Windows operating system. The
screens that appear at each step using another oper-
ating system will vary, but the general steps are very
similar. The driver installation only needs to be done
once on each PC that will be connected to an ASPEN
unit.
Visit http://www.lectrosonics.com, hover your mouse
over Support and click on Aspen Support, then USB
Drivers.
Download the USB Driver Installer.
A zipped file will appear.
NOTE: You must first click on “Extract All” in order
to install the appropriate drivers.
Two versions of the installer are included, one for 32-
bit Windows PCs and another for 64-bit Windows PCs:
• “dpinst-x86.exe” for 32-bit Windows
• “dpinst-amd64.exe” for 64-bit Windows
To start the installer:
Double-click on the appropriate .exe file.
The ASPEN Device Installer opens.
Click Next to proceed.
The End User License Agreement is presented.
Accept, then click Next to proceed.
When installation is complete, the Driver Name and
Status are displayed. Click Finish to close the Device
Installer.

ASPEN Digital Processor
LECTROSONICS, INC.
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ASPEN Software
ASPEN Control Panel
ASPEN processors are set up and monitored using
the ASPEN Control Panel program. The software will
run on Windows 7, Windows Vista®and Windows XP®
operating systems.
Download the installer from the web site at:
http://www.lectrosonics.com/aspensupport
ASPEN Software
Installation
NOTE: Uninstall previous version before
installing the software.
The example shown here illustrates the installation
procedure using a Windows operating system. The
screens that appear at each step using another oper-
ating system will vary, but the general steps are very
similar.
Visit http://www.lectrosonics.com, hover your mouse
over Support and click on Aspen Support, then As-
pen Design Kit.
Download the Design Kit Installer.
A zipped file will appear.
NOTE: You must first click on “Extract All” in order
to install the appropriate drivers.
Next click on Set Up.

Installation and Quick Start Guide
Rio Rancho, NM 9
When the Welcome screen appears, click on Next.
The End User License Agreement screen appears.
Click on I Agree, then on Next to continue.
It is usually best to accept the default folder for the
installation. Click on Next to continue.
Click on Next to confirm the installation and continue.
When the installation is complete the final screen will
appear. Click on Close to finish the installation.

ASPEN Digital Processor
LECTROSONICS, INC.
10
Dante Software
Dante Controller
This is a second software package needed to route
network audio signals between the SPNDNT and other
nodes on a Dante network. The software is download-
ed from the Audinate web site and will run on Windows
and Mac platforms.
Dante Controller is
used to assign the
transmit and receive
signals between
multiple Dante
devices. When a
device is set to
receive a signal from
another device that
is transmitting, it is said to subscribe to the transmit-
ted signal. These subscriptions appear in the Dante
Controller window as green check marks.
Browser based Help Files are provided to explain vari-
ous icons and setup tabs.
Download the software from: http://www.audinate.com
The installation is quick and simple.
DanteTM Software
Installation
Bonjour Print Services (for Windows only)
Download the Bonjour Print Services for Windows
installer into a temporary folder or desktop on your PC.
http://support.apple.com/kb/DL999
Double click on the file to open the installer. If the
Security Warning dialog box opens, click on Run to
launch the installer and follow the on screen prompts.
Set Up Audinate Account and Download the
Dante Controller Installer
Set up an account with Audinate to gain access to the
free Dante Controller software. Click on Login at the
top of the screen and the forms page will open.
http://www.audinate.com
After your account is set up, return to the home page
and click on Support->Software Downloads->Dante
Controller. Log In on the next page and follow the on
screen prompts to download the installer and store the
file on your local drive.
Install Dante Controller
NOTE: Install Bonjour Print Services for
Windows before installing Dante Controller.
Double click on the downloaded file to open the in-
staller. If the Security Warning dialog box opens, click
on Run to launch the installer and follow the on screen
prompts.

Installation and Quick Start Guide
Rio Rancho, NM 11
Mandatory Settings
Set up the system in the Switched Mode in the Net-
work Config screen in Dante Controller. Once every-
thing is set up and audio is flowing to and from the
network, a second network and gigabit switch can be
added and the mode can be changed to Redundant.
Connect an SPNDNT Dante port to the computer either
directly or through a gigabit switch.
Dante Primary Port
Connect the PC to the Primary Port in case the mode
had previously been set to Redundant. Confirm that
the 1G and LINK/ACT LEDs next to the Dante port are
flickering.
Launch the Dante Controller software. A brief splash
screen appears, followed by the Network View/Routing
screen. The serial number of the connected processor
will appear in the bars labeled Receivers and Trans-
mitters.
Processor name and
serial number appear in
the blue bars
Double click on either blue
bar to open the Device View
dialogue box
Double click on the processor name/serial number to
open the Device View dialog box. Under the Network
Config tab, select Switched.
Select
Network
Config
Select
Switched
Select the Device Config tab, then set the sample
rate to 48k. The sample rate MUST be 48k so the DSP
(filters, etc.) will operate as they should.
Device Config Tab
Select 48k Sample Rate
Latency under the same tab can be adjusted depend-
ing upon the number of switches in the network.
The other tabs in the Device View dialog box are used
to rename channels and check the status of several
parameters.
Consult the Help menu for details and explanations of
Dante Controller software.
Made In the USA

ASPEN Digital Processor
LECTROSONICS, INC.
12
Cabling Of Stacked Units
NOTE: The SPNDNT must always be the Master
at the top of the stack to synchronize the ASPEN
system and network clocks.
The ASPEN bus is bidirectional, allowing data and
audio to be propagated forward and backward through
a single cable connection. Each Slave unit in a stack
gathers data and audio signals from the unit below it,
adds its own signals and passes the total on to the
unit above it. At the top of the stack, the Master unit
gathers all signals from below, adds its own and then
sends the total back down the bus to all Slave units.
This architecture allows all Slave units to have access
to the mixing data and audio in all 48 final mixes.
Each circuit board has an upper and a lower ASPEN
bus connector. Since there are two circuit boards in a
2RU unit such as the SPN1624, the circuit boards are
connected in the same manner as if they were each in
a separate chassis.
1RU SPNDNT
configured as
Master
2RU SPN1624
configured as
intermediate
Slave
1RU SPN16i
configured
as lowermost
Slave
ASPEN PORT
The processors automatically configure themselves for
Master and Slave status as determined by the cabling.
Front Panel USB Port
This is the easiest connection point to run ASPEN
control panel software until the network is configured
and IP addresses have been established. Connect the
computer to the Master unit in the ASPEN stack and
launch the control panel software. The Master unit will
appear on the screen, and the Slave units below it will
then be accessible as well.
812
1612
DNT
88
8
8
8
8
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
2
1
61
2
Hardware Connections
Installing the chassis into a rack
Install the chassis so that the cooling fan vent is not
blocked. Mount with 4 rack screws using the appropri-
ate mounting holes. Use nylon washers to prevent
damage to the front panel’s finish when tightening the
mounting screws.
All ASPEN processors have internal switching power
supplies that can tolerate voltages ranging from 100
to 240 VAC. Use an approved power cord with an IEC
60320 C13 connector.
Connecting the Master for the First Time
NOTE: Install ASPEN software before
connecting the Master unit to a computer.
The computer operating system will automatically de-
tect and configure a USB port for the Master unit when
it is connected and turned on the first time. Wait for the
screen message that advises that the new device has
been configured and is ready for use.
Rear Panel
Review the rear panel connectors on page 6. Connec-
tors are used for the following purposes.
Port Purpose
RS-232 Third party control devices such
as LCD touch panels
ETHERNET ASPEN control panel software
interface for setup, monitoring and
control
ASPEN
PORTS
Interconnect multiple ASPEN
processors
DANTE Network audio I/O ports and setup
with Dante Controller software
RS-232 is a common interface with LCD touch panel
control systems such as Crestron®and AMX®. The
wiring diagram for DB-9 connectors is shown on the
opposite page.
The ETHERNET port is used with ASPEN control
panel software for setup, monitoring, control and
diagnostics. It does not transport audio. IP addresses
can be set up statically, or one can be assigned by
a network server if DHCP is enabled in the software
control panel.
ASPEN Ports connect multiple processors for data and
signal flow. 2RU units have two internal circuit boards
that must be connected with cables in the same man-
ner as two separate processors.
The DANTE ports connect to network switches.
Multiple SPNDNT processors can also be connected
directly to each other through these ports.

Installation and Quick Start Guide
Rio Rancho, NM 13
ASPEN RS-232 Port
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
DCD
RX
TX
DTR
GND
DSR
RTS
CTS
RI
TX
RX
GND
Host
Serial
Port
(PC)
ASPEN
RS-232
Port
Wiring Diagram
ASPEN Device to PC
DTE pin
functions
Female
connector
Male
connector
DCE pin
functions
Female
jack
Male jack
Crestron®RS-232 Port Wiring
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
RX
TX
GND
TX
RX
GND
Crestron
RS-232
Port
ASPEN
RS-232
Port
Wiring Diagram
Female
connector
Male
connector
Female jack Male jack
Programmable Inputs
Programmable inputs are provided to enable external
control over a variety of parameters. Each input can
respond to a contact closure, a DC voltage source,
or the variable voltage output from a potentiometer.
The following illustrates common connections to the
programmable input pins.
10K Linear Potentiometer
CCW CW
+5V
To Programmable Input Pin
Gnd
Contact Closure as Programmable Input
To Programmable Input Pin
Gnd
DC Voltage Source as Programmable Input
To Programmable Input Pin
0VDC (Off) to +5VDC (On)
Gnd
Potentiometer Connection for
Analog Control of Gain
Programmable
Inputs
Programmable
Outputs
Ground
+5VDC
Programmable Outputs
Programmable outputs are used for several purposes:
• indicate the current state of a programmable input
• monitor activity on audio input channels
• monitor active preset changes
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 pro-
grammable outputs is 40 V and they will safely conduct
up to 100 mA DC continuous.
Both LEDs and 5V relay coils can be powered by the
+5 V DC pins on the programmable input connector, as
long as the maximum combined current for all LEDS
and relay coils does not exceed 100 mA.
380 Ohms
Programmable Output Pin
380 Ohms
Programmable Output Pin
1N4001
or equiv.
External
DC Voltag
e
Source
(<40VDC)
Relay Coil
Coil current <100mA
Programmable Output Pin
Rela
y is on when the programmable output is active
+5VDC
+5VDC
GND
LED is ON when the programmable output is active
GND
LED is OFF when the programmab
le output is active
Note: The diagram above shows an external DC source
powering the relay coil. This is necessary whenever coil volt-
ages exceed 5 volts.
LED
380 TO
500 OHM
10K
LINEAR
POT
CW
CCW
IN 1
IN 3
ON
OFF
LOGIC OUTPUTS
GROUND
5VDC
LOGIC INPUTS
LOGIC
OUT 7
LOGIC IN 3
ANODE CATHODE Cathode
Anode

ASPEN Digital Processor
LECTROSONICS, INC.
14
100-240V
50/60Hz 30W
ASPEN PORTS
ETHERNET
RS-232
SPN 1624
OUTPUTS INPUTS
OUTPUTS INPUTS
GND
+5V
PROG IN
PROG
OUT
GND
PROG IN +5V
PROG
OUT
Adaptive Proportional Gain Mixing
US Patent 5,414,776
S/N LABEL
DATECODE
Network and PC
Connections
The SPNDNT processor must be the Master at the top
of the ASPEN stack to synchronize the system and
network clocks.
Gigabit ethernet switch
Gigabit ethernet switch
Network Audio Transport
Audio I/O
Audio I/O
These connections
are for setup and
control with ASPEN
Control Panel
software.
Supplied ASPEN cables
RS-232 ports for
external control system
CAT-5 or better
cables
Network Audio Transport
Server
CAT-6 cable
Ethernet switch
OR
(optional)
To front panel
USB port
Using DHCP for IP Address Assignment
Follow these steps to make a network connection for
each processor:
1) Open the ASPEN Control Panel program and
connect to the processor via USB.
2) Click on the Device Settings tab (lower left)
then on the Network tab (left side). Click the
checkbox to enable DHCP.
3) Close the ASPEN Control Panel program.
4) Connect the network cable to the Ethernet port
on the rear panel.
5) Turn the processor power off then back on.
6) Open the ASPEN Control Panel program and
connect to the processor via USB.
7) Navigate to the Device Settings/Network tab
and make a note of the IP address and TCP
port number.
8) Close the USB connection and re-connect via
network. When the dialog box opens, enter the
IP address and the port number noted, then
click on Refresh. Click on the processor icon to
connect.
PC

Installation and Quick Start Guide
Rio Rancho, NM 15
100-240V
50/60Hz 30W
ASPEN PORTS
ETHERNET
RS-232
SPN 1624
OUTPUTS INPUTS
OUTPUTS INPUTS
GND
+5V
PROG IN
PROG
OUT
GND
PROG IN +5V
PROG
OUT
Adaptive Proportional Gain Mixing
US Patent 5,414,776
S/N LABEL
DATECODE
Secondary network for redundancy
RS-232 ports for external control system
Network Audio Transport
Supplied ASPEN cables
CAT-5 or better
cables
CAT-6 cable
Ethernet switch
OR
(optional)
To front panel
USB port Using Switched and Redundant Modes
NOTE: See page 11 for instructions on
selecting the mode using Dante Controller
software.
Set processors to the Switched mode for setup.
In the Switched mode, the Primary and Sec-
ondary ports can be connected in any combi-
nation since there is an ethernet switch in the
hardware.
In the Redundant mode, the Primary ports on
all processors must be connected to the first net-
work and the Secondary ports on all processors
must be connected to the second network.
After all connections and settings are completed
and the system is passing audio through the net-
work, connect the second network and set the
processors to the Redundant mode.
These connections
are for setup and
control with ASPEN
Control Panel
software.

ASPEN Digital Processor
LECTROSONICS, INC.
16
System Setup Examples
Basic Configuration
X = INPUT
O = OUTPUT
This example illustrates the basic signal routing be-
tween two ASPEN subsystems connected via a Dante
network. This setup creates a “full-duplex” connection
where each ASPEN subsystem transmits and receives
signals simultaneously as might be used to conduct
conferencing between two meeting rooms. In this ex-
ample, no local sound reinforcement is in use.
The success of this setup could be limited by loud-
speaker/microphone acoustical coupling in the sound
systems in each room. If the level of the sound from
the loudspeakers arriving at each microphone is not far
below the loudness of the talker, an echo will be heard
at the far end (opposite ASPEN system). With careful
placement of loudspeakers and microphones, and the
use of mix-minus zoning, this type of system can be
used.
NOTE: See the next example regarding the use
of the AEC (acoustic echo canceller) on network
connections.
In the ASPEN subsystem on the left, the blue lines
indicate inputs with the signal path starting at the
microphones. The audio is routed to Mix 1 and Mix 2 in
the ASPEN matrix, which are then assigned to Dante
transmit channels 1 and 2 (labeled Out 1 and Out 2) in
the SPNDNT processor.
In the ASPEN subsystem on the right, Dante receive
channels 1 and 2 are assigned to Mix 1 and Mix 2 in
the ASPEN matrix by the SPNDNT processor. These
two mixes are then selected as the signal sources for
outputs 1 and 2 of the mixer.
The reverse of this signal flow (in red) from the ASPEN
system on the right to the system on the left takes
place through ASPEN Mixes 3 and 4, and Dante trans-
mit channels 3 and 4.
Each ASPEN system is an independent sub-system,
so the Mix numbers used in one system have no bear-
ing on those used in any other ASPEN sub-system.
The Mix numbers used here were chosen only for clar-
ity in visualizing the signal paths.

Installation and Quick Start Guide
Rio Rancho, NM 17
Set up the inputs for the microphones with the gain
value set to achieve 0 dBu on the meter during speech.
Select mixer Inputs tab Audio level meter
Route the microphone inputs to Mix 1 and Mix 2 on
subsystem A and Mix 3 and Mix 4 on subsystem B
under the matrix tab (subsystem A shown).
Select mixer Matrix tab
Select the source signal to be delivered to the outputs.
• For subsystem A: Mix 3 to Out 3; Mix 4 to Out 4
• For subsystem B: Mix 1 to Out 1; Mix 2 to Out 2
Select mixer Output Source tab
Assign Dante receive channels 3 and 4 to Mixes 3 and
4 respectively in the SPNDNT processor in subsys-
tem A and Dante channels 1 and 2 to Mixes 1 and 2
respectively in subsystem B (subsystem A shown)
Select SPNDNT Matrix tab
Select the signal sources to deliver audio to the net-
work from The SPNDNT in each subsystem.
• For subsystem A: Mix 1 for Out 1
• For subsystem B: MIx 2 for Out 2
Select SPNDNT Output Source tab
Create Dante subscriptions in a diagonal pattern: 1:1,
2:2, 3:3, 4:4.

ASPEN Digital Processor
LECTROSONICS, INC.
18
Using the AEC on Network Connections
When the Trio or Conference processor is used in the
ASPEN subsystem, the AEC (acoustic echo canceller)
can be applied to the network connections to suppress
echo caused by acoustical coupling between micro-
phones and loudspeakers. In this example, a local
sound reinforcement system is in place, which further
increases the potential echo.
SUBSYSTEM A SUBSYSTEM B
INPUTS
OUTPUTS
(1->1, 2->2...) (1->1, 2->2...)
(1->1, 2->2...) (1->1, 2->2...)

Installation and Quick Start Guide
Rio Rancho, NM 19
Assign the two microphone inputs to Mix Buses 16 and
17 to be used for local sound reinforcement. Make the
assignments under the SPNTrio matrix tab.
Select SPNTrio Matrix tab
Assign the two microphone inputs to Mix Bus 47 to de-
liver audio to the other ASPEN system via the network.
Make the assignments under the SPNTrio matrix tab.
Select SPNTrio Matrix tab
Select Mixes 16 and 17 as the signal source for the
power amp outputs to feed the local loudspeakers.
Select SPNTrio Output Source tab
Assign the AEC output to Mix 1, which is the signal
source for the audio sent to the other ASPEN system
via the network.
Select SPNTrio Matrix tab
Assign the Signal Mix and Reference Mix in the
SPNTrio under the Conferencing tab. The Signal Mix
contains the audio from the local microphones. The
Reference Mix contains the audio from the other
ASPEN system which the AEC cancels to remove an
echo that might be heard due to coupling between the
local microphones and loudspeakers.
Select SPNTrio Conferencing tab
(See next page)

ASPEN Digital Processor
LECTROSONICS, INC.
20
Assign the Dante receive channel 1 to Mixes 16 and
17 to deliver the audio from the network into the local
sound system under the SPNDNT Matrix tab.
Select SPNDNT Matrix tab
Subscribe to the transmit channels from the opposite
ASPEN subsystems to flow audio back and forth be-
tween the ASPEN systems.
Audio from sub system B to sub system A via
subscription on subsystem A receive channel 1
to flow from subsystem B transmit channel 1.
Audio from system A to system B via
subscription on subsystem B receive channel 1
to flow from subsystem A transmit channel 1.
Assign Dante receive channel 1 to Mix 48 to deliver
the audio from the network to the AEC to provide a
reference signal for echo cancellation.
Select SPNDNT Matrix tab