DTDAMP Amplifiers
DTD
AMP4x0.7
DTDAMP4x1.3
User Manual v1.3
FCC INFORMATION (U.S.A.)
FCC information (U.S.A.)
1. IMPORTANT NOTICE: DO NOT MODIFY THIS UNIT!
This product, when installed as indicated in the instructions contained in this
manual, meets FCC requirements. Modifications not expressly approved by
NEXO-SA may void your authority, granted by the FCC, to use the product.
2. IMPORTANT:
When connecting this product to accessories and/or another product use only
high quality shielded cables. Cable/s supplied with this product MUST be used.
Follow all installation instructions. Failure to follow instructions could void your
FCC authorization to use this product in the USA.
3. NOTE:
This product has been tested and found to comply with the requirements listed in
FCC Regulations, Part 15 for Class “B” digital devices. Compliance with these
requirements provides a reasonable level of assurance that your use of this
product in a residential environment will not result in harmful interference with
other electronic devices. This equipment generates/uses radio frequencies and, if
not installed and used according to the instructions found in the user’s manual,
may cause interference harmful to the operation of other electronic devices.
Compliance with FCC regulations does not guarantee that interference will not
occur in all installations. If this product is found to be the source of interference,
which can be determined by turning the unit “OFF” and “ON”, please try to
eliminate the problem by using one of the following measures:
Relocate either this product or the device that is being affected by the
interference.
Utilize power outlets that are on different branch (circuit breaker or fuse) circuits
or install AC line filter/s.
In the case of radio or TV interference, relocate/reorient the antenna. If the
antenna lead-in is 300 ohm ribbon lead, change the lead-in to co-axial type cable.
If these corrective measures do not produce satisfactory results, please contact
the local retailer authorized to distribute this type of product. If you cannot locate
the appropriate retailer, please contact the After Sales department of NEXO-SA,
Parc d’Activité du Pré de la Dame Jeanne, B.P. 5, 60128 PLAILLY, FRANCE.
The above statements apply ONLY to those products distributed by NEXO-SA
or its subsidiaries.
* This applies only to products distributed in the United States of America.
Important safety instructions
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 dry cloth.
7 Do not block any 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 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 a third grounding prong. The wide blade or the third
prong is 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 receptacles, and the point where they exit from the apparatus.
11 Only use attachments/accessories specified by the manufacturer.
12 Unplug this apparatus during lightning storms or when unused for long periods
of time.
13 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.
Precautions
Please read carefully before proceeding. Please keep this manual in a safe place for
future reference.
WARNING! Always follow the basic precautions listed below to avoid
the possibility of serious injury or even death from electrical shock, short-
circuiting, damages, fire or other hazards. These precautions include, but are not
limited to, the following:
Power supply/Power cord
• Only use the voltage specified as correct for the device. The required voltage is
printed on the name plate of the device.
• Use only the included power cord if any.
• Do not place the power cord near heat sources such as heaters or radiators,
and do not excessively bend or otherwise damage the cord, place heavy objects
on it, or place it in a position where anyone could walk on, trip over, or roll
anything over it.
• Be sure to connect to an appropriate outlet with a protective grounding
connection. Improper grounding can result in electrical shock.
• Remove the electric plug from the outlet when the device is not to be used for
extended periods of time, or during electrical storms.
• When removing the electric plug from the device or an outlet, always hold the
plug itself and not the cord. Pulling by the cord can damage it.
• To disconnect this device from the mains, unplug the power cord.
• Always turn the power off when the device is not in use.
Do not open
• Do not open the device or attempt to disassemble the internal parts or modify
them in any way. The device contains no user-serviceable parts. If it should appear
to be malfunctioning, discontinue use immediately and have it inspected by
qualified NEXO-SA service personnel.
• NEXO-SA cannot be held responsible for damage caused by improper use or
modifications to the device or data that is lost or destroyed.
Water warning
• Do not expose the device to rain; use it near water or in damp or wet
conditions, or place containers on it containing liquids which might spill into any
openings.
• If any liquid such as water seeps into the device, turn off the power immediately
and unplug the power cord from the AC outlet. Then have the device inspected
by qualified NEXO-SA service personnel.
• Never insert or remove an electric plug with wet hands.
If you notice any abnormality
• If the power cord or plug becomes frayed or damaged, or if there is a sudden
loss of sound during use of the device, or if any unusual smells or smoke should
appear to be caused by it, immediately turn off the power switch, disconnect the
electric plug from the outlet, and have the device inspected by qualified NEXOSA service personnel.
• If this device should be dropped or damaged, immediately turn off the power
switch, disconnect the electric plug from the outlet, and have the device inspected
by qualified NEXO-SA service personnel.
PAGE 2 OF 8
IMPORTANT NOTICE FOR THE UNITED KINGDOM
Location
• Before moving the device, remove all connected cables.
• When setting up the device, make sure that the AC outlet you are using is easily
accessible. If some trouble or malfunction occurs, immediately turn off the power
switch and disconnect the plug from the outlet. Even when the power switch is
turned off, electricity is still flowing to the product at the minimum level. When
you are not using the product for a long time, make sure to unplug the power
cord from the wall AC outlet.
• If this device is to be mounted in an EIA-standard rack, leave the back of the
rack open and make sure that it is at least 10 cm away from walls or surfaces.
Also, if this device is to be mounted with devices that tend to generate heat, such
as power amplifiers, be sure to keep an adequate gap between this device and the
heat-generating devices or install ventilation panels to prevent high temperatures
from developing inside this device.
• Inadequate ventilation can result in overheating, possibly causing damage to the
device(s), or even fire.
• Do not use the device in a confined, poorly-ventilated location. If this device is
to be used in a small space other than an EIA-standard rack, make sure that there
is adequate space between the device and surrounding walls or other devices: at
least 10 cm at the sides, 15 cm behind and 40 cm above. Inadequate ventilation
can result in overheating, possibly causing damage to the device(s), or even fire.
• Do not expose the device to excessive dust or vibrations, or extreme cold or
heat (such as in direct sunlight, near a heater, or in a car during the day) to
prevent the possibility of panel disfiguration or damage to the internal
components.
• Do not place the device in an unstable position where it might accidentally fall
over.
• Do not block the vents. This device has ventilation holes at front and back to
prevent the internal temperature from becoming too high. In particular, do not
place the device on the front or the back. Inadequate ventilation can result in
overheating, possibly causing damage to the device(s), or even fire.
• Do not use the device in the vicinity of a TV, radio, stereo equipment, mobile
phone, or other electric devices. Doing so may result in noise, both in the device
itself and in the TV or radio next to it.
Connections
• Before connecting the device to other devices, turn off the power for all
devices. Before turning the power on or off for all devices, set all volume levels to
minimum.
• Use only speaker cables for connecting speakers to the speaker jacks. Use of
other types of cables may result in fire.
• XLR-type connectors are wired as follows (IEC60268 standard): pin 1: ground,
pin 2: hot (+) and pin 3: cold (-).
• Use only SP4 plugs for connecting SP connectors.
Maintenance
• Inspect the ventilation holes and clean them periodically. Dust and dirt can
seriously degrade the effectiveness of the cooling and result in malfunction or fire.
• Remove the power plug from the AC outlet when cleaning the device.
• The performance of components with moving contacts, such as switches,
volume controls, and connectors, deteriorates over time. Consult qualified
NEXO-SA service personnel about replacing defective components.
Handling caution
• When turning on the AC power in your audio system, always turn on the
device LAST, to avoid speaker damage. When turning the power off, the device
should be turned off FIRST for the same reason.
• Do not insert your fingers or hands in any gaps or openings on the device
(vents…)
• Avoid inserting or dropping foreign objects (paper, plastic, metal, etc.) into any
gaps or openings on the device (vents, etc.) If this happens, turn off the power
immediately and unplug the power cord from the AC outlet. Then have the
device inspected by qualified NEXO-SA service personnel.
• Do not use the device for a long period of time at a high or uncomfortable
volume level, since this can cause permanent hearing loss. If you experience any
hearing loss or ringing in the ears, consult a physician.
• Do not rest your weight on the device or place heavy objects on it, and avoid
use excessive force on the buttons, switches or connectors.
• Do not use this device for any purpose other than driving loudspeakers.
Important notice for the United Kingdom
Connecting the Plug and Cord
WARNING! THIS APPARATUS MUST BE EARTHED. IMPORTANT:
The wires in this mains lead are colored in accordance with the following code:
GREEN-AND-YELLOW: EARTH
BLUE: NEUTRAL
BROWN: LIVE
WARNING: As the colors of the wires in the mains lead of this apparatus may
not correspond with the colored markings identifying the terminals in your plug
proceed as follows:
• The wire which is colored GREEN-and-YELLOW must be connected to the
terminal in the plug which is marked by the letter E or by the safety earth symbol
or colored GREEN or GREEN-and-YELLOW.
• The wire which is colored BLUE must be connected to the terminal which is
marked with the letter N or colored BLACK.
• The wire which is colored BROWN must be connected to the terminal which
is marked with the letter L or colored RED.
This applies only to products distributed in the United Kingdom.
Compliance information statement (Declaration of
conformity procedure)
1) This device may not cause harmful interference, and
2) This device must accept any interference received including interference that
may cause undesired operation. See user manual instructions if interference to
radio reception is suspected.
This applies only to products distributed in the United States of America.
Important notice for Europe
Purchaser/User Information specified in EN55103-1 and EN55103-2.
Inrush Current: 26 A (DTD
Conforms to Environments: E1, E2, E3 and E4.
WARNING! This mark indicates a dangerous electrically live terminal.
When connecting an external wire to this terminal, it is necessary either to have
“a person who have received appropriate guidance on handling” make the
connection or to use leads or a cord that have been manufactured in such way
that the connection can be made simply and without problem.
AMP4x0.7) 34 A (DTDAMP4x1.3)
PAGE 3 OF 8
DTDAMP INTRODUCTION
DTDAMP introduction
Welcome to the DTDAMP manual. Please take some time to read it and
learn how to set up the device.
The DTD
AMP is an audio power amplifier developed to perfectly match
the NEXO DTD Controller.
It is a pure power amplifier, without any audio processing, thus
ensuring a negligible latency in the feedback loop feeding the DTD
Controller.
Rack installation
The DTDAMP should be mounted into a suitable rack unit , ensuring
both front and rear mounting holes are used in order to protect the
amp from mechanical damage.
Air flow of the DTD
both DTD
AMP (with DTD Controller) and NXAMP in the same rack,
AMP is from front to back, thus installation can mix
both using the same air flow direction.
Speaker cable choice
WARNING! High voltage can be present on the power
amplifier output terminals. Use at least Class 2 wiring cable to connect
the DTDAMP to the speakers or to feedback to the DTD.
To minimize power and damping factor losses in speaker cable use
suitable wire gauges from the table bellow.
Load Impedance (Ohms) 4 8
Cable Section Maximum Length (meters)
1.5 mm² (AWG #14) 6 m 12 m
2.5 mm² (AWG #12) 10 m 20 m
4 mm² (AWG #10) 16 m 32 m
Note that the outputs of the DTDAMP are connected to the DTD-T,
while its integrated front panel patch is used to connect to the
speakers. With the DTD-I, power output of the DTD
AMP will have to
be spit in two (one side used for DTD-I feedback, the other one going
to the speakers).
WARNING! Unplug the device from mains before connecting
or disconnecting any cable to it.
Connecting the DTDAMP audio inputs
Use the back panel female XLR3 connectors to connect the balanced
analog input signal, typically from a DTD Controller output.
For each pair of amplifier channels, a LINK switch on the back panel
allows you to use the same input signal (from the lowest channel
number input XLR3) to fed the two amplifier channel. This is useful
when connecting the DTD Controller Mono Sub output to two
amplifiers channels for example.
From DTD Output Input Link switch From DTD Output
Up to ten DTDAMP channels can be connected in parallel on one DTD
output.
Connecting the DTDAMP power outputs
The DTDAMP uses four SP4 outputs to connect the speakers. The pin
out is the following:
• Amplifier CH1 outputs on SP4 CH1 1+/1-
• Amplifier CH2 outputs on SP4 CH2 1+/1-
• Amplifier CH3 outputs on SP4 CH3 1+/1-
• Amplifier CH4 outputs on SP4 CH4 1+/1-
Audio Input and Output connections
How to integrate into the audio chain?
Place the DTDAMP in the audio chain just before the speakers, typically
at the output of the DTD Controller.
Typical installation for a touring system (using DTDAM P with a DTD-T)
Typical installation for a fixed installation (using DTDAMP with a DTD-I)
DTD
AMP outputs can be bridged two by two. Note that there is no
switch to use the amplifiers in bridge mode, bridge being always
available with the following pinout:
• Amplifier CH1+CH2 (bridge) outputs on SP4 CH1 2+/2-
• Amplifier CH1+CH2 (bridge) outputs on SP4 CH2 2+/2-
• Amplifier CH3+CH4 (bridge) outputs on SP4 CH3 2+/2-
• Amplifier CH3+CH4 (bridge) outputs on SP4 CH4 2+/2-
WARNING! Use only the CH1 input (for Bridge CH1 + CH2)
or CH3 input (for Bridge CH3 + CH4) and use the corresponding back
panel LINK switch to use the amplifier in bridge mode.
When used with a DTD-T, DTDAMP SP4 outputs are connected to the
DTD-T back panel SP4, while the DTD-T front panel SP4 is connected
to the speakers and subs.
See further for bigger view of the wiring.
PAGE 4 OF 8
DTDAMP SETUP
When used with a DTD-I, DTDAMP SP4 outputs are split into:
• The DTD-I back panel (Sub sensing connector), to ensure
proper feedback of the DTDAMP output to the Controller for
speaker protections.
• The NEXO speakers and subs, as shown on the picture bellow.
Sub R Sub L Main R Main L
Please check the speaker impedance before connecting to the
DTD
AMP.
WARNING! The DTDAMP works with output load down to 4
Ohms in four channels mode or down to 8 Ohms in bridge mode.
Connecting the DTDAMP mains input
The DTDAMP can accept only 100 ~ 120 Volts Mains or 220 to 240
Volts Mains, both 50 to 60 Hz, depending on its internal configuration.
This configuration is set into the factory and the selected value can be
read from the DTD
WARNING! Check the local mains value and ensure that it fits
the need of your DTDAMP before connecting.
Refer to the specification page of this document to know the mains
power requirement of the DTD
and the load connected.
The mains connection is done through a standard IEC-C14 connector.
Check that the mains switch is OFF before connecting the mains
socket.
AMP top panel sticker.
AMP depending on the DTDAMP model
Front panel LEDs display
20 LEDs will report the status of the DTDAMP to the user.
• For CH1 & CH2 on one side and CH3 & CH4 on the other side,
two READY Green LEDs will light once the channel is ready for
use.
• For CH1 & CH2 on one side and CH3 & CH4 on the other side,
two TEMP Yellow LED will :
o Stay OFF if amplifier heatsink is bellow 75 °C.
o Blink if amplifier reaches 75 °C, meaning that the output level
is reduced to protect the unit.
o Turn ON if amplifier reaches 85 ° C, meaning that the output
is muted due to over temperature.
• For each Channel, three green LEDs indicate the channel level.
o SIGNAL will light when input signal is fed.
o -18 dB will light when output level is 18 dB from max.
o -6 dB will light when output level is 6 dB from max.
• For each Channel, one PEAK red LED indicates that the maximum
output voltage is reached for a channel, thus triggering the
AMP peak limiter.
DTD
Maintenance
WARNING! Always unplug the DTDAMP from the mains before
cleaning it.
Check regularly the dust level of the air intakes of the DTDAMP. If
some dust is inserted into the cooling tunnel of the amplifier, use
compressed air to remove dust from the amplifier.
The chassis and the front panel can be cleaned using a dry cloth.
Thermal dissipation and current drawn
DTDAMP setup
The DTDAMP setup is straightforward. Once all the wiring has been
done, set the volume control to the minimum position (-infinity) power
ON the DTD Controller and switch the DTD
ON position.
Wait a few seconds that the two “READY” indicators light up and turn
the volume for each channel in use to the first as show bellow.
Send some audio signal into the DTD
or sub is outputting a non-distorted sound.
Once this has been checked, turn the audio source down and set up
the volume control to the 0 dB position.
WARNING! When used in bridge mode, set the two volume
control knobs of the channels bridged to the same position (0 dB for
example).
AMP mains switch to the
AMP and check that each speaker
DTDAMP4x0.7 with 4 Ohms load on each channel
Line Current (A) Thermal Dissipation
120 V 230 V
Watts
Dissipated
BTU/h kcal/h
Idle 1.0 A 0.5 A 65 W 215 55
1/8 Max
7.5 A 3.8 A 580 W 785 200
power
1/4 Max
13 A 6.5 A 1100 W 1250 315
power
DTDAMP4x1.3 with 4 Ohms load on each channel
Line Current (A) Thermal Dissipation
120 V 230 V
Watts
Dissipated
BTU/h kcal/h
Idle 1.0 A 0.5 A 65 W 220 55
1/8 Max
12 A 6 A 900 W 955 240
power
1/4 Max
22 A 11 A 1800 W 1780 450
power
PAGE 5 OF 8
DTDAMP Output wiring
DTD
AMP 4 x channel mode to DTD-T
DTDAMP OUTPUT WIRING
DTD
AMP 2 x bridged channel mode to DTD-T
PAGE 6 OF 8
Specifications
SPECIFICATIONS
Power specifications
Number of channel 4 x amplifiers channel, 2 by 2 bridgeable
Max. output voltage (no load) 4 x 85 Volts 4 x 135 Volts
Max. output power (4 x 8 Ohms) 4 x 360 Watts 4 x 750 Watts
Max. output power (4 x 4 Ohms) 4 x 700 Watts 4 x 1300 Watts
Max. output power (2 bridge x 8 Ohms) 2 x 1400 Watts 2 x 2600 Watts
Audio characteristics
Frequency Response +/- 0.5 dB from 20 Hz to 20 kHz
Input Impedance 10 kOhms
Input Sensitivity +5 dBU +8 dBU
Nominal Gain 32 dB
Dynamic Range (A-weighted) > 110 dB
THD+N Typical 0.01 %
Back panel features
Analog audio input 4 x balanced analog inputs on XLR3
Power output 4 x SP4 outputs
Link switch To use same XLR input for 2 x adjacent channels
Mains sockets IEC C14 inlet with secure lock
Front panel features
Switch and knobs Mains On/Off switch and volume control knob per channel
View Meters 4 x LEDs (Signal / -18 dB / -6 dB / Peak) per channel
Amplifier status Amp Ready and Temperature indicator per channel pair
Mains Requirements
Mains Voltage Factory set for 120 volts or 230 volts mains operation
Power consumption (Idle) 65 Watts
Power consumption 1/8 max. / 4 Ohms 580 Watts 900 Watts
Power consumption 1/4 max. / 4 Ohms 1100 Watts 1800 Watts
Physical specifications
Dimensions (W x H x D) 480 (W) x 44 (H) x 370 (D) mm, 19 inches / 1U
Weight 7.5 kg
Operating temperature range 0° C – 45 ° C
Certifications
CE conformity 2006/95/CE (Low voltage) 2004/108/CE (EMC) 2002/95/CE (RoHS)
Electrical safety certification CSA, CB, EN60065
EMC certification EN55103-1 / EN55103-2 / FCC
Ordering information
Pre-configured for 230 volts mains DTDAMP4x0.7C DTDAMP4x1.3C
Pre-configured for 120 volts mains DTDAMP4x0.7U DTDAMP4x1.3U
DTDAMP4x0.7 DTDAMP4x1.3
PAGE 7 OF 8
Drawings and dimensions
DRAWINGS AND DIMENSIONS
Declaration of conformity (DoC)
We,
NEXO S.A.
ZA du Pre de la Dame Jeanne
60128 Plailly
France
Declare under our sole responsibility that the products
Professional Audio Equipment
Model: DTD
Manufacturer name: NEXO S.A.
Manufacturer address: ZA du Pre de la Dame Jeanne, 60128 Plailly, France
CE Mark first affixed in: 2016
to which this declaration relates is in conformity with the following standard(s) or other normative document(s)
CE Directives 2006/95/EC (Low Voltage) 2004/108/EC (EMC) 2002/95/EC (RoHs)
EN 55103-1:2009 + A1:2012 / EN 55103-2:2009 + IS :2012
FCC Part 15:2013
EN 60065:2002 + A1:2006 + A11:2008 + A2:2010 + A12:2011
IEC60065 (ed.7) + AM1 + AM2, including national differences for EU, AU, CA, JP, US
CSA and CCC Certification
Plailly, France
Date: July 6, 2016
480 mm
44
mm
AMP4x0.7, DTDAMP4x1.3
Joseph CARCOPINO
R&D Director, NEXO
PAGE 8 OF 8
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