Asystems reserves the right to alter any information
contained within this manual without prior notice�
V1�0 06/12/2016
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NT2508 / NT2504 / NT1308 / NT1304 / NT4004
IMPORTANT SAFETY INSTRUCTIONS
The apparatus shall not be exposed to dripping or splashingand that no objectswith liquids, such as vases,
shall be placed on the apparatus. The MAINS plug is used as thedisconnect device,the disconnect device shall
remain readily operable.
Warning: the user shall not place this apparatus in thearea during theoperation so that the mains switch
can be easily accessible.
1. Read these instructions before operating this
apparatus.
2. Keep these instructions for future reference.
3. Heed all warnings to ensure safe operation.
4. Follow all instructions provided in this document.
5. Do not use this apparatus near water or in locations
where condensation may occur.
6. Clean only with dry cloth. Do not use aerosol or liquid
cleaners. Unplug this apparatus before cleaning.
7. Do not block any of the ventilation openings. Install
’
in accordance with the manufacturer
s instructions.
8. Do not install near any heat sources such as radiators,
heat registers, stoves, or other apparatus (including
.
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 a third grounding prong. The wide
blade or the third prong is provided for your safety. If
the provided plug does not into your outlet, consult
an electrician for replacement of the obsolete outlet.
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER (OR BACK)
NO USER SERVICEABLE PARTS INSIDE
REFER SERVICING TO QUALIFIED PERSONNEL
The lightning flash with arrowhead symbol, within an
equilateral triangle, is intended to alert the user to the
presence of uninsulated
product
magnitude to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is in-
tended to alert the user to the presence of important operat-
ing and maintenance (servicing) instructions in the literature
accompanying the appliance.
WARNING: To reduce the risk of or electric shock, do
not expose this apparatus to rain or moisture.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
“
dangerous voltage”within the
’
10. Protect the power cord from being walked on or
pinched particularly at plug, convenience receptacles,
and the point where they exit from the apparatus.
11. Only use attachments/accessories by the
manufacturer.
12. Use only with a cart, stand, t ripod, bracket, or
table 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 tipover.
13. Unplug this apparatus during lighting
storms or when unused for long
periods of time.
14. Refer all servicing toservice 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.
CAUTION: Use of controls or
adjustments or performance
of procedures other than those may result in
hazardous radiation exposure.
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NT2508 / NT2504 / NT1308 / NT1304 / NT4004
1. INTRODUCTION
Congratulations on your purchase of a NT series network amplier. The NT’s exible deisgn will provide you with up to
eight channels of audio with advanced DSP processing. A single NT amplier oers eight-in, eight-out support (or four-in,
four-out), and the entire system can be controlled through standard potentiometers or exible remote software. Internal
processing is accomplished through a high quality 40-bit oating point processor, with internal signal processors and
routing all handled with ease�
NT series digital network ampliers oer easy, eective means for injecting signal processors directly into your input
and output path, with clear, easy-to-use software both onboard and on your Windows computer. The software oers full
performance monitoring for each processor, giving real-time information on the load placed upon DSPs�
2. FEATURES
● 4 or 8 input channels available via 3-pin Euroblock connections
● Built-in multi-channel amplifier for low-impedance or line distribution application*
● Amplifier provides up to 250 Watts of power per channel (exact output can be found in specs)
● 4x4 or 8x8 matrix routing input channels to any output channel
● 40-bit floating point processor with internal sampling selectable between 44.1 and 48 kHz
● 4x4 or 8x8 networking capabilities through audio streaming LAN card (sold separately)
● Ethernet connectivity for network and internet control application
● Automatic DHCP network IP configuration
● Easy and intuitive control software from Asystems
● 4-band parametric equalizers can be assigned to all inputs
● Adjustable compressors and limiters built-in
● Delay time can be adjusted in meters, feet or milliseconds
● User-dened crossovers available on output channels
English
*Operating mode is dependent on purchased model.
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3. CONTROLS AND I/O
FRONT PANEL
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NT2508 / NT2504 / NT1308 / NT1304 / NT4004
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1. Mounting Holes
These holes are for mounting the NT series network
amplier in a standard 19” rack.
2. Output Level Control Knobs
Every output channel is equipped with a rotary knob
for adjusting the nal output level. These controls can
be deactivated using POLE 6 on the rear-panel DIP
switch�
3. IN LEDs
Every input channel is equipped with a 4-segment IN
LED level meter, including a CLIP/PROTECT indicator.
4. BRIDGE LED
This LED lights when the two corresponding channels
are bridged with one another.
NOTE: Every input channel is equipped with one output level
control knob, one IN LED and 1 level meter� Each channel pair
features a BRIDGE LED�
5. Cooling Inlet Vents
Cool air is drawn in here� Please do not cover these
vents for any reason as you risk overheating the NT�
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6. Indicators
POWER: Lights when the device is on�
DISABLE: Lights when the power switch is disabled.STANDBY/UNLOCK: Lights when the NT system is in
the Standby mode.
PROTECT: Lights when the protect circuity is active�
7. Power Switch
Flick this switch to turn the unit on and enter it into
STANDBY mode. Please note that this switch can be
disabled through the onboard software. If the power
switch becomes unresponsive, check your power
settings�
WARNING: The NT requires up to 2 minutes to be fully discharged
after the power is turned o. During this time the system cannot
be powered on properly.
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NT2508 / NT2504 / NT1308 / NT1304 / NT4004
NT2504 / NT1304 / NT4004
NT25408 / NT1308
REAR PANEL
The Asystems NT2508, NT2504, NT1308, NT1304 and NT4004 share the same basic I/O design and layout. The major
dierence is that the NT2508 and NT1308 have 8 line input channels and 8 speaker output channels, while the NT2504, NT1304 and NT4004 all have 4 input connectors and 4 speaker output channels (as shown below).
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1. AC Power Connector
This power inlet is for connecting a standard IEC
power cable. Under no circumstances should the user
remove the grounding pin on the power cable.
2. Unit ID Controls
The Unit ID controls consist of a single rotary switch
as well as 8-pin DIP switch. These essentially adjust
various controls and settings as well as things like
rmware updates. More information on Unit ID settings
can be found in the relevant area of this manual. These
controls extend to IP address settings and initialization.
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G
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4. SPEAKER OUTPUTS (Amplied Output)
For connecting passive loudspeakers�
5. ETHERNET Connector
RJ-45 connector for connecting the NT series network
amplier to a PC or local area network.
6. DIGITAL I/O
This slot is for Asystems’ DT44 or DT88 Dante
Networking card to enable the NT as a networking
portal to other Dante-enabled devices. The Dante
Networking card is sold separately�
3. INPUT Connectors
Line-level Euroblock input connectors are oered.
4. INSTALLATION AND SETUP
4.1 RACK MOUNTING
NT2508, NT1308, NT2504, NT1304 and NT4004 are compatible with standard 19” audio equipment racks. Slide the NT
in to the rack and secure it with four Phillips screws and appropriate square nuts. The NT network ampliers each take
up 2 standard units of rack space�
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NT2508 / NT2504 / NT1308 / NT1304 / NT4004
Amplifiers
Audio In
Amplified Out
4.2 INSTALLING THE DANTE NETWORK CARD
To install the optional Dante networking card, simply remove the 2 screws from the network port, then slide the DT44 or
DT88 networking card into the network port. Replace the 2 screws to secrure it rmly into place.
4.3 CONNECTIONS
Connect all necessary input and output devices�
+
G
Audio In
++++
To PC/Internet/
Intranet
Amplified Out
AUDIO INPUT
Input can be achieved through correctly wiring the
Euroblock connectors.
Unbalanced
PIN 1: Shield/Ground
PIN 2: Link to PIN 1
PIN 3: Hot (+)
Additional NT
Series
NT2504 / NT1304 / NT4004
AUDIO OUTPUT
These euroblock outputs are used to connect speakers,
either in low-impedance or distributed lines depending
on your model. Amplied outputs are wired like so:
PIN 1: Cold (-)
PIN 2: Hot (+)
Each pair of amplied output channels can be bridged
into one channel. This combines the output power of
both channels creating a single channel with twice as
much power�
To bridge channels, just wire the “+” pin of an odd-
numbered channel to the “+” pin of the next even
channel. When bridged, the “+” pin of the even channel
becomes the “-” pin of the bridged new output.
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When activating bridge mode, be sure to go into the
Control Panel menu of the NT software and click the
corresponding “Bridged” button.
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NT2508 / NT2504 / NT1308 / NT1304 / NT4004
4.4 IP ADDRESS SETUP
Connecting the NT series network amplier to a computer
for remote operation requires the user to enter an IP
address for the unit� There are two controls that help
determined the IP address of the NT network ampliers.
The rst is the UNIT ID rotary control, that lets you select
0 – 9 and A – F� The second is the DIP switch located
directly beside the rotary switch. The 3rd and 4th poles
of the DIP switch can be used to set a numerical value
between 0 and 3. These combine with the UNIT ID rotary
switch to form a hexadecimal value for the last value of
the IP address (as indicated below).
192.168.0.Xx
These values can be calculated in decimal using a
programmer’s calculator, or by checking the chart provided
at the bottom of this page. The below image indicates how
the last part of the IP address is determined using these
switches
The DIP switch allows the rst digit shown below to be
selected between 0, 1, 2 and 3 with the congurations
shown below. This determines the rst digit of the IP
address (in hexadecimal).
The UNIT ID rotary control
allows a value between 0 and F
to be selected. This determines
the second digit of the IP
address (in hexadecimal).
Once both digits of the hexidecimal IP address have been
selected, it still needs to be converted to decimal for the
user to have an accurate IP address� This is where the
table below comes into play. If the DIP switches are set as
“2” and Unit ID is F, this equals a hexidecimal value of 2F
which converts to a decimal value of 47 (shown below).
Therefore, in this example, the IP will be 192.168.0.47.
When setting the IP address using the UNIT ID controls,
the second pole of the DIP switch must be set to the upper
position. When in the lower position, the system will use
the IP address set through the Windows Remote software�
NT2508, NT1308, NT2504, NT1304 and NT4004 can be controlled via a connected Windows-based PC. The instructions
below assume users have already set their unit’s IP address as described on the previous page.
1. Connect the Ethernet port of the NT network amplier to the Ethernet port of your computer with a CAT5 RJ-45
Ethernet cable.
2. On your PC, right click your network icon and select
“Open Network and Sharing Center”�
G
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4. Click “Properties” button.
3. Double click your main connection located next to the
“Connections”.
5. Select “Internet Protocol Version 4 (TCP/IPv4)” and
then click the “Properties” button.
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NT2508 / NT2504 / NT1308 / NT1304 / NT4004
6. Change the eld “IP address” to “192.168.0.3”, and then click “OK”�
7. Launch the control software by double clicking the
executable le. The latest version of the NT control
software can always be found on the Asystems website.
8. Within the Login box of the NT control software, enter
the following:
IP Address: 192�168�0�47
User Name: USER_1
Password: ASYSTEMS
4.6 RESTORE FACTORY SETTINGS
1. Switch POLE 7 on the rear panel DIP Switches to the
ON position�
2. Power on the NT series network amplier.
3. Switch POLE 7 to OFF�
4. Switch the Power Switch to the “I” position (stand by).
5. Now your NT is restored to the factory default settings�
NOTE: A factory restore is particularly helpful in the event
that user names and passwords are forgotten� Restoring
to factory default settings will restore user names back
to default values�
4.7 ACTIVATING ROTARY CONTROLS
Use pole 6 on the rear panel DIP switch to turn the front
panel controls on and o. When OFF, the rotary volume
controls on the front of the NT will be deactivated. In the
event that controls are not functioning, be sure to check
this before taking further action.
9. Click
In addition to this switch, each and every individual
control can be deactivated within the software. Within
the Control Panel page, the ON/OFF buttons at the very
bottom of each channel will allow you to turn the front
panel rotary controls on and o.
4.8 FIRMWARE UPDATE
When performing a rmware update, a few steps need
to be followed. First of all, set the rst pole of the DIP
switch to the upper-most position.
A connection needs to be established between the NT
system and the Windows remote software� After this is
done, enter the Global Settings tab and the Utility menu.
At the very bottom of the page, click the “Update” button
under the Firmware section. Users will be prompted
to select the rmware le (available on the Asystems
website) and the rmware update process will begin.
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NT2508 / NT2504 / NT1308 / NT1304 / NT4004
5. CONTROL SOFTWARE
DSP
The DSP page will give you an overall prole of input and
output mixes as well as signal processors.
Name Cell: The white boxes at the left and right of
each row will display the name of each input and output
channel. Users can edit the name for each channel by
double-clicking on the white box.
ON/OFF: This button will allow the user to switch the
corresponding input channel on and o.
Signal Processor Cells: Every input/output channel has
a row of three arrow shaped cells� The signal processors
included are the PEQ, crossover and delay. These signal
processors are set by default but can be bypassed by the
user�
Channel In: Clicking the blue bar to the left of the screen will jump directly to the “Channel In Matrix” tab.
Channel Out: Clicking this green bar allows the user direct acccess to the “Control Panel” tab.
Clear: Clicking this button resets all DSP congurations.
Analog In Matrix
In this page, you can assign any input source to any output
channel by clicking the corresponding cell in the cell matrix.
Example:
The image below shows how to assign input channels 1
through 8 to their corresponding outputs�
Analog In and Network In: Use these two buttons to view analog input sources connected via rear panel, as well as
digital input sources from the Dante card�
INV: Select this button to invert the phase of the corresponding channel.
ON: Select this button to turn the corresponding signal on and o.
CLEAR: Clicking this button erases all assigned input/output routing.
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NT2508 / NT2504 / NT1308 / NT1304 / NT4004
Network Matrix
By pushing the Network In button you can access the
Network routing page� Here you can assign your Network
signals to the various output channels� All controls are as
same as controls under the Analog In Matrix page.
Control Panel
The control panel menu oers complete control of output
channels. This menu includes level controls, metering, and
a host of other parameters that can be edited.
Channel Name: A pre-selected channel name can be
viewed or edited in this screen�
Fader: The input level can be adjusted using this onscreen
fader�
OUT: The input and output signal level of the channel can
be viewed through these meters. They can be adjusted
between pre- and post-fader meters.
GR: The gain reduction meter will provide a real-time
indication of any reduction in gain applied by the internal
DSP processes (including compressors-limiters, equalizers,
etcetera).
Limiter: This button will activate the internal limiter function for the corresponding channel. The limiter can be adjusted
through the Global Settings > Lim page.
Pre/Post: This button allows you to adjust the output meter between a pre-fader and post-fader meter.
INV: This button will invert the phase of the corresponding signal.
ON/OFF: This button will turn the corresponding channel on and off.
Bridged: When the speaker outputs are wired for bridge mode, users must push this button to bridge the outputs of the
two channels�
Front Level Control: The Control Panel page also includes an on/off button for the front-panel level controls. These can
be used in addition to the rear panel DIP (pole 6) to deactivate individual front panel rotary controls. In addition to this
button, users can view the position of their front panel rotary controls through the virtual rotary controls featured at the
bottom of the page.
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NT2508 / NT2504 / NT1308 / NT1304 / NT4004
Global Settings
LIM - Limiter/Compressor Settings
This menu allows compressors and limiters to be applied to
channel outputs�
Limiter Threshold: This control determines the threshold
for the limiter function� This means that no signal will surpass
the selected threshold, being ‘compressed’ at a ratio of
innity:1.
Compressor Threshold: Use this control to set the threshold
of the compressor function� Any signals that surpass the
selected threshold will be compressed at the selected ratio.
Compressor Ratio: This control can be used to set
the ratio for the compressor. The ratio is expressed as
<input>:<output>.
Compressor Attack: This control adjusts the attack time of the compressor, essentially determining the time taken for the
compressor to kick in after it passes the selected threshold�
Compressor Release: The release control determines the time the NT will wait before disengaging the compressor when
the signal bypasses the selected threshold.
System Clock
System Clock: This menu allows you to select a master
clock source for digital devices. Selecting 44.1 or 48 kHz
will set the NT as the master clock source and determine
the sampling rate. Selecting AES/EBU, Network, or Word
Clock will set these as the master clock� Whenever a
new clock source is selected, the ENTER button must be
pushed to conrm.
Power Settings: There are three power settings on the NT�
The software power can be turned on and o, essentially
enabling the NT to be turned on and o via the software
– including event scheduling� The hardware power can
be selected on and o, essentially allow the unit to be
activated and deactivated using the hardwired switch on
the front of the NT�
Utility
All of the DSP processes can have their settings saved
for later use. While there are a number of factory presets
available, users are always encouraged to nd their own
settings and save them for later use. The NT has onboard
storage for a number of settings to be saved, or users can
connect USB ash drives to save settings.
Also available in the Utility menu is a rmware update
button. When a new version of rmware is available it can
be installed using the “Update” button. Place the rmware
update le on a formatted USB ash drive and insert it into
a USB port. The “Update” button should take care of the
rest�
After the rmware is updated, the initialize button can
be selected to reset the device. Save any settings (or
“scenes”) before initializing the system.
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NT2508 / NT2504 / NT1308 / NT1304 / NT4004
Network
There are two pages under this tab.
PC
The PC menu offers a number of fields for network
configuration� The user can offer a device name in this
menu, while also including fields for the IP Address,
Subnet Mask and Gateway Address.
The DHCP button allows users to enable a Dynamic
Host Configuration Protocol on the unit. Enabling the
DHCP allows your network to automatically provides an
Internet Protocol (IP) host with its IP address and other
related configuration information such as the subnet
mask and default gateway�
Unit
The Unit menu allows users to view the device name
and IP address assigned to the NT series network
amplifier�
Security
Users can adjust their User Account Profiles through this
menu. Up to 8 user-specific accounts can be created, with
the default names all being USER_x (where x is a number,
1 through 8). The default password is ASYSTEMS. Simply
select the user name and password fields on screen to
change them for each account� Once a user name and
password are defined, click “SAVE” to store.
User names and passwords are all restored to defaults
when the system is restored to factory default settings�
Remote Control From PC
Enter necessary information to log in�
Default values are:
IP Address: 192.168.0.xx
User Name: USER_1
Password: ASYSTEMS
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NT2508 / NT2504 / NT1308 / NT1304 / NT4004
Protect
The protect menu gives real-time updates on the system
performance� Everything from the system temperature
to the output wattage is represented on this page� If the
Protect LED on the front of the NT amplier lights up, this
menu can be viewed to better understand the issue.
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NT2508 / NT2504 / NT1308 / NT1304 / NT4004
SPECIFICATIONS
NT1304NT1308NT2504NT2508NT4004
Low Z, Stereo Mode, all channels driven (RMS Power Ouput Per Channel)
8Ω, 20Hz-20kHz 1%THD
4Ω, 20Hz-20kHz 1%THD
Low Z, Bridge Mode, all channels driven (RMS Power Output)
8Ω, 20Hz-20kHz 1%THD
Distributed Output (RMS Power Output Per Channel)
70V, 100V, 20Hz-20kHz 1%THD
Models Available4Ω and 8Ω / 70.7V Constant Voltage / 100V Constant Voltage