Dynacord Stereo Amplifier DPA 4411 User Manual

OWNER’S MANUAL  
POWER AMPLIFIER DPA 4411  
Features  
Power amplifier with 4x100 W output power capacity according to IEC 283-3  
19" - rack size (3 HU) unit that provides the following functions:  
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Mains operation 115/230 V AC and operation with emergency power supply of 24 V DC  
Output transformers for balanced, floating 100 V loudspeaker networks: 70 V, 50 V or  
4 ohms for low-impedance operation can be selected  
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All outputs are protected against idling and short-circuit  
Integrated Remote Module for control and monitoring using the PROMATRIX Manager DPM 4000  
Electronic level controls, electronically balanced inputs and electronically balanced MONITOR output  
Input transformer for balanced, floating inputs can be retrofitted  
Monitor output transformer for balanced, floating MONITOR output can be retrofitted  
Routing switch for parallel operation of the amplifier’s inputs  
Integrated Standby Power Supply  
Mains function switch - POWER  
Ground lift switch  
Remote-Start function for mains and battery operation with inrush current limiter protection  
Power-on noise attenuation  
Status-LED indicators: operation (READY), STANDBY, thermal overload (PROTECT)  
and GROUND FAULT at the power outputs  
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Fault notification according to DIN EN 60849 via the PROMATRIX Manager DPM 4000  
TEST-switch for systems with average-switching or GROUND FAULT RESET  
LED meters with a range from -13 dB to 0 dB plus CLIP indication  
Mains voltage selector switch 115/230 V AC  
Active, temperature-controlled ventilation  
Modules for pilot tone surveillance and ground fault surveillance according to DIN VDE 0800 are  
optionally available  
19  
 
Indicators, Controls And Connections  
1
2
LED meters with a range from -13 dB to 0 dB  
CLIP indicators  
3
4
TEST button for checking and reset function  
STANDBY indicator  
5
PROTECT indicator  
6
GROUND FAULT indicator  
7
READY indicator  
8
Air inlets  
9
POWER ON switch  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
AC MAINS INPUT connector  
Mains fuse  
VOLTAGE SELECTOR switch  
REMOTE CONTROL connectors  
STATUS indicator  
INPUT connectors 1-4  
ROUTING switch for INPUT 1-4  
Device address label field  
ADDRESS selector switch  
POWER OUTPUT  
Device output configuration label field  
Air outlets  
22  
23  
CIRCUIT ^ TO CHASSIS SWITCH  
DC INPUT 24 V =  
A Rear plate screws:  
6 oval-head sheet-metal screws 3.5 x 6.5 zinc-coated DIN 7981  
B heat-sink-mounting: 4 oval-head sheet-metal screws 3.5 x 9.5 zinc-coated DIN 7981  
C PCB-mounting:  
9 oval-head screws M3 x 12 nickel-plated DIN 7985  
D socket-mounting:  
8 oval-head screws PT-KA 30 x 8 WN-1412EJOT black, zinc-coated  
21  
 
Table of Contents  
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19  
Indicators, Controls And Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21  
1. Utilization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23  
2. Installation Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23  
3. Before Initial Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23  
3.1 Mains Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23  
3.2 Battery Operation 24 V DC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24  
4. Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24  
5. Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25  
5.1 POWER OUTPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25  
5.2 POWER OUTPUT for the connection of 100 V loudspeaker systems . . . . . . 25  
5.3 POWER OUTPUT for the connection of low-impedance loudspeaker systems 25  
5.4 POWER OUTPUT 100 V - Double Output Power . . . . . . . . . . . . . . . . . . . . . . 26  
5.5 MONITOR Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26  
6. Integrated Remote Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26  
7. Indicators And Fault Notification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27  
7.1 STANDBY Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27  
7.2 READY Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27  
7.3 PROTECT Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27  
7.4 GROUND FAULT Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28  
7.5 Meter Instruments And CLIP Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28  
7.6 STATUS Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28  
8. Switching The Output Voltage (refer to qualified service personnel only!) . . . . . . . 28  
9. Additional Functions And Features (refer to qualified service personnel only!) . . 29  
9.1 NRS 90206 Pilot Tone Surveillance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29  
9.2 NRS 90207 Ground Fault Surveillance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30  
9.3 NRS 90208 Input Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31  
9.4 NRS 90227 Monitor Output Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32  
10. 19"-Flightcase Or 19"-Rack System Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 32  
11. Ground Lift Switch CIRCUIT ^ TO CHASSIS SWITCH . . . . . . . . . . . . . . . . . . . . 33  
12. Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33  
13. DPA 4411 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35  
14. Specifications For DPA 4411 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36  
14.1 NRS 90206 Pilot Tone Surveillance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36  
14.2 NRS 90207 Ground Fault Surveillance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36  
14.3 NRS 90208 Input Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36  
14.4 NRS 90227 Monitor Output Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36  
15. Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55  
15.1 DPA 4411 Power Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55  
15.2 NRS 90206 Pilot Tone Surveillance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56  
15.3 NRS 90207 Ground Fault Surveillance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57  
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1. Utilization  
The amplifier DPA 4411 has been specially designed to ensure durable performance and reliable  
operation of sound reinforcement systems with several independent loudspeaker lines. The DPA 4411 is  
best suited for call and message transmission installations, alert systems, and for general music  
applications in industrial enterprises, offices, multi-function halls and sport arenas, schools, churches,  
hotels, hospitals, super markets, cruise ships, and similar applications.  
2. Installation Notes  
When installing or mounting the amplifier, it is important to make sure that unhindered air-flow from the  
air inlets on the front to the air outlets on the rear of the appliance is guaranteed (see paragraph 10).  
To maintain EMV disturbance-free operation, the use of shielded cable for all input, output and control  
lines, except for mains supply and battery cords, is mandatory. When installed inside of metal housings  
or rack systems, running unshielded output and control lines is possible. Cable screens have to be  
connected to the enclosure or rack system ground potential.  
The amplifier has to be protected against:  
- dropping or splashing water  
- direct sunlight  
- high environmental temperatures or direct radiation of heat sources  
- high humidity and moisture  
- dust  
- shock or vibration  
It is not permissible to place containers filled with liquids - e. g. vases - ontop of the appliance  
When moving the amplifier from cold into warm environments, condensation of its inner parts can  
sometimes occur. If so, the appliance can be operated again after gaining the environmental temperature  
(approximately after one hour).  
If a solid object has fallen or liquid has leaked into the device, disconnect all connectors and get in contact  
with an authorized DYNACORD service center. Do not operate the amplifier after such accidents.  
When cleaning the amplifier’s outside enclosure, never use any cleaning sprays or detergents, because  
of inflamability. The use of those liquids will damage the appliance.  
3. Before Initial Operation  
3.1 Mains Operation  
When operated on mains power, use the included mains cord to connect the amplifier to a 230 V or 115  
V 50/60 Hz wall outlet. Connect the cable’s other end to the appliance’s 3-pole machine-type socket (10).  
Caution  
The amplifier is factory-set to 230 V AC. To change the setting to 115 V AC, use the  
voltage switch (12).  
For the operation with 115 V AC, the mains fuse (11) has to be replaced by an 8 Ampère  
slow-blow fuse with the label print “T8AL” (see also paragraph 12).  
When correctly connected and with mains power present the green STANDBY indicator (4) will light. Now,  
through sending the corresponding command via the serial interface of the Remote Module, it is possible  
to start the amplifier from the PROMATRIX Manager DPM 4000 (see PROMATRIX handbook).  
The POWER switch (9) on the rear of the amplifier – for bridging the starting relay – is meant for service  
purposes only. It offers the possibility to operate the amplifier without remote start.  
Note  
The POWER switch (9) on the rear of the appliance is for service purposes only. Remote  
power-off is not possible with the POWER switch set to ON. In this case, the STANDBY  
indicator (4) provides no function.  
The DPA 4411 is equipped with a cut-in delay of approximately 3 seconds to efficiently suppress power-on  
noise. After this period of time and when no fault was detected, the green READY indicators (7) will light  
(see paragraph 7.2).  
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3.2 Battery Operation 24 V DC  
The amplifier DPA 4411 can either be operated on the AC mains or connected to an external 24 V battery  
power source. Switching to battery operation is accomplished via internal relay.  
The battery has to be connected to the corresponding socket (23) on the rear panel of the appliance using  
insulated AMP flat connectors 6.3x0.8 mm. The amplifier is protected against confusion of poles.  
Additional internal protection is provided through two miniature fuses – F502 and F503 – one per each  
conductor (+ and -), which are located on the printed board assembly 85272 (see paragraph 12, diagram  
2
11). For the DPA 4411 the battery cable’s diameter should be at least 2.5 mm and the cable length for  
the single distance should not exceed 4.0 m (max. drop in voltage < 1V).  
Caution  
Operation of the DPA 4411 is solely allowable using batteries without grounding or  
batteries with grounding of the negative pole. Operation with batteries with grounding of  
the positive pole is not permissible.  
4. Inputs INPUT 1 to INPUT 4  
The inputs INPUT 1 to INPUT 4 (15) are electronically balanced. With a sensitivity of 775mV = 0dBu they  
are meant for the connection of control amplifiers. For the case that floating inputs are needed, the inputs  
are prepared for retrofitting input transformers.  
Note  
If a switch-contact is located between the control amplifier output and the power amplifier  
input, switch clicks might become audible during switching. If this is the case, incorporating  
input transformers (NRS 90208 - one per input) can solve the problem (see paragraph 9.3)  
Parallel operation of INPUT 1 to INPUT 4 (15) is possible when using the ROUTING  
switches (16). This allows to connect the input signal through to feed several power  
amplifiers with the identical program. Use a permanent marker pen to mark the  
needed setting of the ROUTING switches (16) next to the ROUTING switch  
push-button symbol.  
diagram 1  
input socket connection  
diagram 2 LF-cable for coupled operation of two DPA 4411  
24  
 
5. Outputs  
5.1 POWER OUTPUT  
All power outputs are balanced and floating. When factory-shipped, the outputs are pre-configured for the  
connection of 100 V loudspeaker systems. Connection is achieved through plugging the supplied 8-pole  
socket into the connection strip (19). Switching the output transformer allows to change the output voltage  
to 70 V, 50 V or 20 V (see paragraph 8). When set to 20 V, operation of low impedance speakers with a  
load of 4 ohms is possible.  
Caution  
During operation it is possible that the outputs of the POWER OUTPUT connector may  
conduct dangerous voltage (>34 V in peaks). Therefore, observing applicable safety  
regulations is mandatory when connecting and installing loudspeaker lines  
(see also paragraph 9.2).  
5.2 POWER OUTPUT for the connection of 100 V loudspeaker systems  
The use of speaker systems with 100 V matching transformers is recommended to reduce the lack in  
performance when the distance between amplifier and speaker systems exceeds 50 m. This method also  
offers an easy way to distribute the output power. The total power consumption of the maximum amount  
of the connected speakers in the network has to match the amplifier’s overall output capacity of 100 watts  
(connection impedance 100 ohms). The connection is accomplished via the 100 V output (19)  
(see figure 3).  
diagram 3 Connection of 100 V (70 V or 50 V) loudspeaker systems  
5.3 POWER OUTPUT for the connection of low-impedance loudspeaker systems  
When switching the output to 20 V, low-impedance speaker systems (4-16 ohms) can be connected to  
the corresponding output (see diagram 4). Because of line attenuation, the distance between amplifier  
and speaker systems should not exceed 50 m. It is of further importance that the overall impedance of  
the speakers does not decline 4 ohms and that the individual power handling capacity of each speaker  
is not exceeded.  
diagram 4 Connection of low-impedance loudspeaker systems  
25  
 
Free combination of the DPA 4411’s power output voltages, including mixed 100 V and low impedance  
(4 ohms) operation, is possible.  
5.4 POWER OUTPUT 100 V - Double Output Power  
If the output power of one output of the DPA 4411 is not sufficient to feed all cabinets within a speaker  
network and dividing the speaker chain is not an option, it is possible to double the output power by  
coupling the outputs of two amplifiers. In that case the amplifier inputs have to be paralleled and the  
outputs are connected in series. For the connection of inputs, please refer to paragraph 4. For the  
connection of the loudspeaker network, refer to diagram 5.  
Coupling is possible under the following restrictions: only identical amplifiers or power amps can be  
connected. Since doubling the output voltage comes along with serial connection, it is necessary to switch  
the outputs of both amplifiers to 50 V (see also paragraph 8), resulting again in an overall output voltage  
of 100 V. In this case the speaker chain’s minimum load impedance is 50 ohms // 50 nF. The input level  
controls of the corresponding channels of the DPA 4411 have to be set to equal values (refer also to the  
PROMATRIX handbook).  
This results in the following output combinations with a single DPA 4411:  
4 x 100 W or 2 x 100 W + 1 x 200 W or 2 x 200 W.  
diagram 5 Possible output configuration of the DPA 4411  
5.5 MONITOR output  
The MONITOR output of the DPA 4411 is configured as monitor bus. It gets connected to thePROMATRIX  
Manager DPM 4000 via the serial port REMOTE CONTROL (13). If a floating output is needed,the output  
is prepared for retrofitting a monitor output transformer. In this case the extension NRS 90227 is necessary  
(see paragraph 9.4). The low-impedance monitor output is electronically balanced. Therefore, the  
connected cables may be up to approx. 200 m in length.  
The PROMATRIX Manager DPM 4000 (see PROMATRIX handbook) offers connection for monitor  
amplifiers; which can be set to input-monitoring or output-monitoring for the desired amplifier channel.  
6. Integrated Remote Module  
The integrated remote module of the power amplifier DPA 4411 provides the following functions:  
· input levels of INPUT 1 to INPUT 4 can be set via programmable audio level controls  
· reading level values of the audio level controls  
· setting level offsets 1 to 4 via virtual controllers  
· mute function 1 to 4 (via level controls)  
26  
 
· mains operation remote control ON/OFF  
· battery operation remote control ON/OFF  
· monitoring and fault message transmission via the PROMATRIX Manager DPM 4000; in accordance  
to DIN EN 60849 standard  
- thermal overload of the mains transformer  
- thermal overload of power output stages 1 to 4  
- monitoring of the functioning of the power output stages 1 to 4 via pilot tone signal (optional, only with  
NRS 90206 installed)  
- ground fault detection for loudspeaker lines 1 to 4 (optional, only with NRS 90207 installed)  
- measuring of input and output level peaks 1 to 4  
- measuring of output voltages / levels of the power outputs 1 to 4  
- measuring of output currents of the power outputs 1 to 4  
- monitoring of connected loads 1 to 4 via current-voltage-measuring  
- recognition of amplifier type including user-definable name  
- reading of software revision of the remote module  
- reading of error flags  
- reading of the output configuration  
- recognition of extensions NRS 90206 and NRS 90207  
· switching the input monitor / output monitor 1 to 4 to the monitor bus  
· pilot tone signal ON/OFF (optional, only with NRS 90206 installed)  
· ground fault error flags reset  
Note  
Prior to the first operation of the amplifier DPA 4411, you have to set the amplifier address  
using the two Hexadecimal Code switches ADDRESS (18) (refer to the PROMATRIX  
handbook) and using a waterproof marker pen mark the setting in the ADDRESS label field  
on the rear panel of the appliance.  
By sending the corresponding command via the serial port REMOTE CONTROL (13) of the remote  
module, this function is activated from the PROMATRIX Manager DPM 4000 (see PROMATRIX  
handbook).  
7. Indicators And Fault Notification  
7.1 STANDBY Indicator  
When correctly connected and with mains voltage and/or battery voltage present, the green STANDBY  
indicator (4) lights.  
7.2 READY Indicator  
The power amplifier DPA 4411 provides a power-on delay of approximately 3 s to prevent switch clicks  
from becoming audible. If after this period of time no faulty condition has been detected, the green READY  
indicator (7) lights and the mute-relays pull. When thermal overload of the mains transformer or of one of  
the power output stages is detected, the corresponding green READY indicator (7) will not light and the  
according mute-relay drops. If, with the NRS 90206 extension installed the pilot-threshold (see paragraph  
9.1) is declined, the corresponding green READY indicator (7) goes out but the amplifier stays operational  
and a fault message gets transmitted to the PROMATRIX Manager DPM 4000.  
7.3 PROTECT Indicator  
In case of thermal overload of the mains transformer or of a power output stage is detected, the red  
PROTECT indicator (5) will light. During thermal overload of the mains transformer, all mute-relays drop  
while during thermal overload of a power output stage, only the according mute-relay drops. After the  
mains transformer or the power amplifier have regained their normal temperature, the red PROTECT  
indicator (5) automatically goes out and the appliance recovers normal operation mode. The faulty  
condition could have been caused by either overload, too high environmental temperature, or by an error  
in the ventilation system. A fault-message is transmitted to the PROMATRIX Manager DPM 4000.  
27  
 
7.4 GROUND FAULT Indicator  
If, with built-in NRS 90207 a ground fault condition at one of the power outputs occurs, the corresponding  
red GROUND FAULT indicator (6) lights and a fault-message is transmitted to the PROMATRIX Manager  
DPM 4000. The power amplifier keeps up normal operation during the occurrence of this fault-type. After  
solving the problem, the GROUND FAULT indicator (6) can be reset by pressing the TEST button (3) or  
by sending the corresponding command via the serial port of the PROMATRIX Manager DPM 4000 (see  
PROMATRIX handbook) (see paragraph 9.2).  
7.5 Meter Instruments And CLIP Indicators  
The green LED-indicator -13 dB and 0 dB (1) as well as the red LED-indicator CLIP (2) allow the precise  
monitoring of output levels, providing the possibility to securely prevent distortion and clipping that could  
lead to damaging the connected loudspeaker systems.  
- When during program peaks the red CLIP-LED (2) lights briefly, the maximum distortion-freeoutput  
is gained.  
- Whenever the CLIP-LED (2) lights continuously, the amplifier is driven into overdrive and the input level  
should be reduced.  
- Overload or short-circuit at the output is the cause for the green LED-indicator (1) to beout or only briefly  
lit while at the same time the red CLIP-LED (2) blinks. In that case, please check the impedance of the  
connected load.  
Caution  
During normal operation, the red CLIP-LED (2) should hardly light and if, than  
only very briefly !  
7.6 STATUS Indicator  
The yellow STATUS-LED (14) that is located on the rear of the appliance lights briefly during normal  
operation when the DPM 4000 addresses a query to the amplifier. For further information, please refer to  
the PROMATRIX handbook.  
8. Switching The Output Voltage (refer to qualified service personnel only!)  
The DPA 4411 offers output voltages of either 20 V, 50 V, 70 V or 100 V. The output voltage is  
factory-preset to 100 V. Switching the output voltage to 20 V, 50 V or 70 V should only be carried out by  
qualified DYNACORD service personnel.  
Caution  
Unplug the mains cord and disconnect batteries before opening the appliance!  
- for opening the appliance, please remove the 9 screws on the top of the appliance that lock the cover  
plate.  
- the four output transformers 356762 are located on the left hand side of the appliance. They are  
numbered 1, 2, 3, and 4; starting from the rear cover plate of the appliance.  
- for changing the output voltage (see diagram 6) you have to unsolder the orange wire attached to the  
transformer’s soldering tab 19 (100 V) and solder it instead to the required soldering tab (70 V, 50 V or  
20 V).  
- closing the appliance: use the 9 screws M3 x 6 DIN 7500 to reattach the cover plate.  
diagram 7 Output configuration settings of the  
diagram 6 Switching the output voltage at the  
amplifiers (rear view)  
output transformers 356762  
28  
 
Note  
After changing the output voltage, use a waterproof marker pen to note the correct, newly  
set value on the label-field OUTPUT VOLTAGE (20) on the rear of the appliance.  
Additionally note the corresponding output configuration (see diagram 5) on the label OUT  
CONFIG TYPE (20).  
According to the description in diagram 7, adjust the switches S801 and S802 on the printed  
board assembly 89019.2 that are located next to the transformers on the bottom of the  
appliance’s enclosure (refer also to paragraph 5.4 ).  
diagram 8 Printed board assembly 89019.2 showing the position of the switches S801 and S802  
9. Additional Functions And Features (refer to qualified service personnel only!)  
9.1 NRS 90206 Pilot Ton Surveillance  
Using the extension-kit NRS 90206 provides continuous monitoring (surveillance) of the individual  
amplifier channels. This is achieved by sending an ultra low-level 19 kHz pilot tone through the device. It  
enters the signal path post level controls, runs through the amplification stages and gets filtered out and  
evaluated at the output. In case the result of this evaluation shows that the pilot dropped beneath a defined  
threshold or is missing at all, the corresponding READY indicator AMP 1 - 4 (7) goes out but the power  
amplifier upholds its normal operation. A fault-message is transmitted to the PROMATRIX Manager DPM  
4000 (see PROMATRIX handbook). The extension-kit NRS 90206 comes as a plug-in board assembly  
and consists of a 19 kHz tone-generator and four selective 19 kHz receivers with evaluation stage.  
Caution  
Unplug the mains cord and disconnect batteries before opening the appliance!  
9.1.1 To Install The NRS 90206 Proceed As Follows (see diagram 9):  
- for opening the appliance, please remove the 9 screws on the top of the appliance that lock the cover  
plate.  
- the NRS 90206 gets retrofitted on the printed board assembly 89019.1, which is located behind the input  
printed board assembly 81331, in the front area, attached to the left side panel of the amplifier (in front  
view).  
- Be sure to first insert the included board-guides before installing the printed board assembly, assuring  
the correct position of their guide grooves. The release lever of the guides marked “A” points to the top,  
while the one of the guides marked “B” points downwards.  
- the NRS 90206 extension-kit needs to be inserted with its printed side pointing to the top, until it firmly  
locks in place. Make sure that the power resistors R917 to R920 that are located underneath the  
NRS-printed board assembly do not touch this board.  
- closing the appliance: use the 9 screws M3 x 6 DIN 7500 to reattach the cover plate.  
29  
 
diagram 9 Printed board assembly 89019.1 showing the position of the modules NRS 90206 and  
NRS 90207  
9.1.2 Checking The Function Of The NRS 90206:  
With built-in NRS 90206 and powered-on amplifier, the READY-indicators (7) have to light. Use the check  
and reset-button TEST (3) to check the functioning of the pilot tone surveillance. When holding the  
TEST-button pressed, the 19 kHz tone-generator is switched off, the READY-indicators (7) go out and a  
fault-message is being transmitted to the PROMATRIX Manager DPM 4000 (see PROMATRIX hand-  
book). Approximately 3 seconds after releasing the TEST-button, the READY-indicators (7) have to light  
again.  
9.2 NRS 90207 Ground Fault Surveillance  
The VDE regulation DIN VDE 0800 has to be obeyed when planning and operating 100 V sound  
reinforcement systems. Especially 100 V alert systems have to be in accordance with all protection  
measures for class 3 appliances.  
We recommend the use of the ground fault surveillance module NRS 90207 for floating speaker network  
installations, offering surveillance of the network insulation. Error registration: A ground fault message  
signals that a damaged cable has been detected – possibly resulting in an upcoming cable interruption –  
or a wrongly connected cable, possibly resulting in malfunctioning. The information “ground fault” is  
memorized as long as the amplifier is powered on or a loaded battery is connected, even for short-term  
( > 5 s) ground faults. The fault-message is transmitted to the PROMATRIX Manager DPM 4000 (see  
PROMATRIX handbook).  
The NRS 90207 extension comes as a plug-in printed board assembly and consists of a monitoring circuit  
with error-storage and display-driver for four 100 V outputs.  
Caution  
Unplug the mains cord and disconnect batteries before opening the appliance!  
9.2.1 To Install The NRS 90207 Proceed As Follows (see diagram 9):  
- for opening the appliance, please remove the 9 screws on the top of the appliance that lock the cover  
plate.  
- the NRS 90207 gets retrofitted on the printed board assembly 89019.1, which is located behind the input  
printed board assembly 81331, in the front area, attached to the left side panel of the amplifier (in front  
view).  
- Be sure to first insert the included board-guides before installing the NRS 90207, assuring the correct  
position of their guide grooves. The release lever of the guides marked “C” points to the top, while the  
one of the guides marked “D” points downwards.  
- the NRS 90207 extension-kit needs to be inserted with its printed side pointing to the top, until it firmly  
locks in place. Make sure that the power resistors R917 to R920 that are located underneath the  
NRS-printed board assembly do not touch this board.  
- closing the appliance: use the 9 screws M3 x 6 DIN 7500 to reattach the cover plate.  
30  
 
9.2.2 Checking The Function Of The NRS 90207:  
With built-in NRS 90207 and powered-on amplifier, the READY-indicators (7) have to light. When using  
an external switch to shortcut one pole of the 100 V speaker network via a 47 k ohms resistor and the  
safety earthing conductor for approximately 5 seconds, the corresponding GROUND FAULT indicator (6)  
has to light. The fault-message is transmitted to the PROMATRIX Manager DPM 4000 (see PROMATRIX  
handbook). After releasing the external switch, indication and message have to stay present. Use the  
TEST-button (3) to reset the ground fault surveillance function.  
9.3 NRS 90208 Input Transformer For Floating, Balanced Inputs  
In case floating inputs are needed, the inputs of the DPA 4411 are prepared for retrofitting input  
transformers; a separate NRS 90208 extension-kit is needed per input.  
Note  
If a switch-contact is located between the control amplifier output and the power amplifier  
input, switch clicks might become audible during switching. If this is the case, incorporating  
input transformers can solve the problem.  
Caution  
Unplug the mains cord and disconnect batteries before opening the appliance!  
9.3.1 Retrofitting The NRS 90208 On The Printed Board Assembly 81331:  
- for opening the appliance, please remove the 9 screws on the top of the appliance that lock the cover  
plate  
- detach the rear panel by removing the screws marked “A” to “D” (refer to the picture of the rear panel  
on page 21).  
- remove the input printed board assembly 81331: (see diagram 10)  
remove the 8 screws marked “D” that tighten the input sockets and detach the 6 flat cables CN1 to CN6.  
For removing the printed board assembly 81331 you have to unscrew the two screws on the side panel  
- before installing the input transformer, make sure to unsolder the resistors for T1: R1/R5, for T2:  
R9/R13, for T3: R17/R21, for T4: R25/R29 and clean the corresponding eyelets  
- place the input transformer onto the printed board assembly 81331, so that the markings on the board  
and on the bottom part of the transformer are aligned. As a protection against short-circuit, place the  
supplied insulating disk between the printed board and the transformer  
- before re-installing the printed board assembly 81331, reconnect the flat cables CN1 to CN6. Keep in  
mind that the plug of the cable leading to CN1 (AMP1+2) is marked. Now, reconnect the printed board  
assembly 81331 to the amplifier’s side panel, using two screws M3 x 12  
- installation of the rear panel:  
first, connect the POWER OUTPUT printed board assembly to the rear panel, using two screws marked  
“C”. Make sure not to squeeze any wires. Now, you can slide the rear panel underneath the four  
lock-fish-plates of the input sockets. In doing so, mind that the acknowledge button of the ROUTING  
switches need to be pulled through the corresponding openings  
input sockets are tightened with two screws marked “D”, each  
the power supply printed board assembly 85272 gets tightened using two screws marked “C”; mind the  
acknowledge button of the CIRCUIT ^ TO CHASSIS SWITCH.  
tighten the Remote Control printed board assembly with two screws marked “C”; mind the yellow  
STATUS-LED  
tighten the mains-input printed board assembly 86243 using three screws marked “C”; tightenthe mains  
connector (10) and the mains selector switch (12) with individual screws and self-securing nuts M3  
reinstall the rear panel using 6 screws marked “A”  
tighten the heat sink using four screws marked “B”  
- closing the appliance: reconnect the cover-plate using 9 screws M3 x 6 DIN 7500  
31  
 
diagram 10 Printed board assembly 81331 showing the position of the input transformers NRS 90208  
9.4 Monitor Output Transformer NRS 90227 Offering A Floating, Balanced MONITOR Output  
In case a floating MONITOR output is needed, the monitor amplifier’ output is prepared for retrofitting an  
output transformer. Herefore, you will need the extension kit NRS 90227.  
Caution  
Unplug the mains cord and disconnect batteries before opening the appliance!  
9.4.1 To Install The NRS 90227 Proceed As Follows: (see diagram 10)  
-
for opening the appliance, please remove the 9 screws on the top of the appliance that lock the  
cover plate.  
-
-
-
de-install the input printed board assembly 81331 following the description in the paragraph 9.3.1.  
disconnect the resistors R95, R96, R97 and R101 before installing the monitor output transformer.  
mount the monitor output transformer on the printed board assembly 81331; in doing so, polarity is  
of no importance, since the transformer is balanced.  
reinstall the input printed board assembly 81331 following the description in paragraph 9.3.1.  
-
closing the appliance: use the 9 screws M3 x 6 DIN 7500 to reattach the cover plate.  
10. 19"-Flightcase Or 19"-Rack System Installation  
Caution  
Operating the DPA 4411 without cover-plate is not admissible.  
When incorporating the DPA 4411 into a 19" flightcase or 19" rack system, make sure to leave room for  
sufficient air-flow. Between the amplifier’s rear plate and the inside-wall of the surrounding enclosure has  
to be at least 60 mm x 330 mm of space until up to the enclosures top or its ventilation gaps. At least 100  
mm of space should be left above a rack system to guarantee sufficient air circulation. Since, during the  
operation of the DPA 4411 the environmental temperature within the rack closet may increase by about  
10° C, minding the maximum allowable temperature values for other equipment that is installed into the  
same rack system or enclosure is of major importance.  
Note  
For trouble-free operation of the appliance, the maximum environmental temperature  
of +40 °C is not to be exceeded.  
32  
 
11. Ground Lift Switch CIRCUIT ^ TO CHASSIS SWITCH  
Using the ground lift switch CIRCUIT ^ TO CHASSIS SWITCH (22) lets you separate the audio signal  
ground from the enclosure ground (safety earthing). This helps to solve problems with hum or noise without  
jeopardizing safety standards. If several units with ground lift switch are installed in a common enclosure  
or rack system, it is recommended to set the ground lift switches of all devices but one to “ungrounded”.  
Set to “ungrounded”, the impedance between signal ground and enclosure is: 100 k ohms // 100 nF. It is  
necessary to maintain the immunity from EMV.  
12. Fuses  
Location  
Pos.  
Used for  
Value  
Dimensions  
Standard  
Fuse switch (11)  
Fuse switch (11)  
Board 86243  
Board 85272  
Board 85272  
Board 85272  
Board 85272  
Board 85272  
Board 85272  
F601  
F601  
F602  
F502  
F503  
F504  
F505  
F506  
F507  
Mains fuse 230 V~ AC  
Mains fuse 115 V~ AC  
Mains fuse AC  
Battery fuse 24 V DC  
Battery fuse 24 V DC  
Power-AMP 1  
Power-AMP 2  
Power-AMP 3  
Power-AMP 4  
T4AL 250V  
T8AH 250V  
T1AL 250V  
25AL 32V  
25AL 32V  
T6.3AL 250V 5 x 20 mm  
T6.3AL 250V 5 x 20 mm  
T6.3AL 250V 5 x 20 mm  
T6.3AL 250V 5 x 20 mm  
5 x 20 mm  
5 x 20 mm  
8.5 x 8.45 mm  
Flat type fuse  
Flat type fuse  
IEC 127  
IEC 127  
IEC 127  
DIN 72581-3  
DIN 72581-3  
IEC 127  
IEC 127  
IEC 127  
IEC 127  
Changing The Fuses F502 And F503 (see diagram 11):  
Caution  
Unplug the mains cord and disconnect batteries before opening the appliance!  
The battery fuses F 502 and F503 are located on the mains (power supply) printed board assembly 85272  
behind the AMP-battery connectors. In case they need to be replaced, commence as follows:  
-
-
open the appliance by removing the 9 screws that lock the cover-plate  
remove the mains input printed board assembly 86243 that is located at the rear inner wall.  
Therefore, unplug the yellow/green ground conductor form the corresponding connector at the rear  
inner wall. To remove the AMP-plug, press its lock-piece  
-
-
-
now, you have to remove the 3 screws of the mains-input printed board assembly 86243 marked “C”  
(refer to the picture of the rear panel on page 21).  
disconnect the 6-pole flat cable between the two relays on the mains-input printed board assembly  
86243 that is connected to the male multi-point connector B602  
now, the hinged mains-input printed board assembly 86243 can be turned up. In doing so, be careful  
not to damage any wiring or other parts  
-
-
the fuses F502 and F503 are now easy to get to and can be removed to the top  
for re-installing the mains-input printed board assembly 86243, proceed in opposite order:  
tighten the mains-input printed board assembly 86243 with the 3 screws marked “C”, where each,  
the mains plug (10) and the mains selector switch (12) need to be connected using individual screws  
and self-securing nuts M3.  
-
-
reconnect the 6-pole flat cable to the multi-point connector B602  
reconnect the yellow/green ground cord to the ground connector on the rear panel; make sure that it  
sits tight  
-
closing the appliance: reattach the cover-plate with 9 screws M3 x 6 DIN 7500  
33  
 
Caution  
For safety reasons make sure that after reassembling, wires running underneath the  
mains-input printed board assembly 86243 are run with a minimum distance  
of at least 6 mm.  
diagram 11  
Printed board assembly 85272 showing the position of the DC-fuses F502 to F507  
34  
 
13. DPA 4411 Specifications  
Power supply on mains operation:  
operation voltage  
115 V / 230 V~ AC, ±10 %  
mains frequency range  
safety class  
50 - 60 Hz  
I
mains operation  
Standby  
0idling  
Normal operation (-10 dB)  
Alarm (-3 dB)  
Umains [V]  
Imains [A]  
Pmains [VA]  
Pmains [W]  
Pout [W]  
Pv [W]  
230  
230  
230  
230  
230  
0,016  
0,29  
1,64  
3,25  
4,39  
3,7  
67  
377  
748  
1010  
1,5  
40  
275  
585  
815  
0
0
40  
200  
400  
1,5  
40  
235  
385  
415  
Nominal conditions  
mains initial current inrush  
< 36 A  
mains operation  
Umains [V]  
Imains [A]  
Pmains [VA]  
Pmains [W]  
Pout [W]  
Pv [W]  
Standby  
0idling  
Normal operation (-10 dB)  
Alarm (-3 dB)  
Nominal conditions  
115  
115  
115  
115  
115  
0,30  
0,50  
3,28  
6,50  
8,78  
3,5  
58  
377  
748  
1010  
1,5  
40  
275  
585  
815  
0
0
40  
200  
400  
1,5  
40  
235  
385  
415  
mains initial current inrush  
< 20 A  
Pmains[VA] =apparent power Umains*Imains, Pmains[W] =true power, Pout[W] =output power, Pv[W] =leakage power  
Power supply on battery operation:  
operation voltage  
24 V DC, -10/+30 %  
battery operation  
UB [V]  
IB [A]  
Pi [VA]  
Pout [W]  
Pv [W]  
Standby  
0idling  
Normal operation (-10 dB)  
Nominal conditions  
24  
24  
24  
24  
0,06  
1,1  
7,5  
18  
1,5  
26  
180  
432  
0
0
40  
250  
1,5  
26  
140  
182  
battery initial current inrush  
< 3,9 A  
Pi[W] = input power UB*IB, Pout [W] = output power, Pv [W] = leakage power  
input characteristics:  
nominal input level  
power output characteristics:  
nominal output power with mains supply  
nominal output voltage  
electronically balanced  
775 mV = 0 dBu / 10 k ohms  
balanced, floating  
4 x 100 W (according to IEC 268-3)  
with mains supply  
with battery supply at 24 V DC  
nominal load impedance  
100 V ( 70 V / 50 V / 20 V )  
79 V ( 56 V / 40 V / 16 V )  
100 ohms ( 50 / 25 / 4 ohms)  
minimal allowable output impedance:  
100 W output power  
200 W output power  
100 V output  
70 V output  
50 V output  
20 V output  
100 Ohm // 250 nF  
50 V + 50 V output  
—————  
—————  
50 Ohm // 500 nF  
50 Ohm // 500 nF  
25 Ohm // 1000 nF  
4 Ohm // 6250 nF  
—————  
—————  
—————  
—————  
noise voltage (A-weighted)  
£ -56 dBu  
£ 1 %  
THD at P  
A NOMINAL  
amplification frequency response  
60 Hz .. 20 kHz  
35  
 
distortion-limited response  
(P -3dB, kS = 1 %)  
60 Hz .. 5 kHz  
A NOMINAL  
crosstalk between two channels  
³ 80dB at 1 kHz / ³ 60dB at 10 kHz  
MONITOR output characteristics:  
nominal output voltage  
nominal load impedance  
electronically balanced  
2 V = + 8.2 dBu  
600 ohms  
amplification frequency response  
60 Hz .. 20 kHz  
environmental temperature  
+5 °C .. +40 °C  
technical regulations:  
This appliance is in accordance to the following regulations  
EN 55103-1, EN 55103-2, EN 55022  
EN 60065, EN 60555  
dimensions (W x H x D)  
19“ (483 mm) x 3HU (132 mm) x 345 mm  
installation depth without external connectors  
340 mm  
installation depth incl. external connectors  
weight  
max. 400 mm  
22.5 kg  
color  
anthracite  
Extension kits for the DPA 4411:  
NRS 90206 pilot tone surveillance (for four amplifiers)  
NRS 90207 ground fault surveillance (for four outputs)  
NRS 90208 input transformer (per single input)  
NRS 90227 monitor output transformer  
Order No. 121 639  
Order No. 121 640  
Order No. 121 641  
Order No. 121 679  
14. Specifications For DPA 4411 Accessories  
14.1 NRS 90206 pilot tone surveillance (for four amplifiers)  
pilot frequency  
19 kHz ± 1%  
fault recognition threshold  
fault message output  
£ 12 mV  
separate for each output; via  
PROMATRIX Manager DPM 4000  
14.2 NRS 90207 ground fault surveillance (for four outputs)  
input  
loudspeaker line 20 V / 50V / 70V / 100V  
separate for each output; via  
PROMATRIX Manager DPM 4000  
1000 Veff  
fault message output  
voltage strength  
fault recognition threshold  
£ 50 k ohms  
14.3 NRS 90208 input transformer (per single input)  
transmission range  
20 Hz .. 20 kHz  
input impedance  
³ 10 k ohms  
idling ratio  
1:1  
primary winding resistance  
1420 ohms at 20°C  
secondary winding resistance  
1420 ohms at 20°C  
14.4 NRS 90227 monitor output transformer  
transmission range  
40 Hz .. 20 kHz  
nominal load impedance  
idling ratio  
³ 600 ohms  
1:1  
primary winding resistance  
secondary winding resistance  
18 ohms at 20°C  
18 ohms at 20°C  
36  
 

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