Norden NVS-20100252AM User manual

NVS-20100252AM/NVS-20110502AM/NVS-20011002AM
2 Channels Digital Power Amplifier
User Manual

1
.
Thank you for using our public address system. Please read this User Manual
carefully to make better use of this equipment

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Contents
Profile of Product……………………………………………………………………………………………3
 Description………………………………………………………………………………………….. 3
 Features…..……………………………………………………………………………………………3
Appearance…………………………………………….……………………………………………………….4
 Front Panel……………………………..……………………………………………………………..4
 Rear Panel……………………………………………………………………………………………..5
Connection Diagram………………………………………………………………………………………...6
 Input Connection…………………………………………………………………………………...7
 Output Connection…………………………………………………………………………………7
Specifications………………….……………………………………………………………………………….8

3
Profile of Product
Description
The NVS-20100252AM/NVS-20110502AM/NVS-20011002AM is a Class D digital
amplifier designed for commercial and industrial public address applications.
Rack mount design in 1U type. Both balanced and unbalanced line inputs are
available for each channel. Balanced line output feeds to another power amplifier
as well as secures the signal transmission is less noise and longer distance. 70V,
100V speaker outputs are convenient for installation when selection different
speaker matching. Complete protection includes clip, short circuit, high
temperature, and overload. With indications for power, signal, clip, protection, and
temperature.
Features
 Multiple channels: 4-channel or 2-channel
 5-unit LED lamp for status display
 Advanced active PFC (power factor correction)
 Efficient switching power supply
 Efficient CLASS D amplifier
 Support DC 24V power supply
 Adjust fan speed with temperature
 Equipped with voltage limit circuit
 All-protected circuit design
 Support real-time switch of 70/100V output
 Input sensitivity: 775mVRMS
 Both line input and output interfaces adopt HT-3.96 phoenix
 100VRMS prior line input
 Balanced prior line input
 Balanced line input
 HB-9500 7.62 fence output socket with cover is adopted for power output

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Appearance
Front Panel
1. Indicator
PRO: After being powered on and input with signal, if the protection indicator
(PRO) and LIM are on first, go out after a few seconds, and are on again, the
output short circuit fault occurs, and the above phenomena will repeat if the
fault is not removed. Now, power off immediately, and re-power on after
troubleshooting.
LIM: Limit indicator
A. Both LIM and PRO are on: Amplifier is in short circuit or over-current
protection.
B. LIM is on while PRO goes out: After the continuous repeated signal makes
the output power reach or exceed rated power for 2-4s, the power limits the
start of circuit and halves the rated output power automatically. This circuit
will not be started with audio and music applications under rated power.
CLP: Clip indicator, please reduce the gain properly to avoid severe clip
SIG: Signal indicator (signal output)
70V: Gear indicator, if it is on, the current gear is 70V output voltage.
2. Channel volume control knob
Name the volume control knob (CH1) by the number of channels with an analogy,
such as CH1, CH2
3. Power switch
Power switch is provided with power indicator, when placing it in ON position, its
internal power indicator will be on.

5
Rear Panel
1. 220V AC power input (with fuse holder)
2. 24V DC power input (max. access core is Φ6mm)
3. Air outlet of fan
4. 70V/100V voltage output
5. 70V/100V output switch
6. Prior 100VRMS single unbalanced line input (2-position 3.96 phoenix)
7. Prior balanced line input (3-position 3.96 phoenix, priority signals 6 and 7
are directly mixed. After the priority signal amplitude exceeds threshold,
the balanced line inputs to enter the mute status, and the balanced signal
recovers output after it is lower than threshold for 2-3s)
8. Balanced line input (3-position 3.96 phoenix)
9. Balanced line output (3-position 3.96 phoenix)

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Connection Diagram

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Input Connection
All line inputs and outputs should be connected to the 3-position 3.96 phoenix
(Figure 1) or 2-position 3.96phoenix (Figure 2) on the machine's rear panel.
(Figure 1) 3-position 3.96 Phoenix (Figure 2) 2-position 3.96 Phoenix
P — Signal (+)
G —Ground
N — Signal (-)
100V — 100V output terminal (hot terminal) of external constant voltage amplifier
GND — Output ground (cold terminal)
Output Connection
Output terminal locates on the rear panel and can be directly connected with wire.
COM is common terminal and OUT is hot terminal.
Note: Never ever pair two "hot terminals."

8
Specifications
Part Number
NVS
-
20100252AM
NVS
-
20110502AM
NVS
-
20011002AM
Number of
Channels
2 2 2
Rated Output
power of each
channel
125W 250W 500W
Input Sensitivity 775mVRMS (0dBV/all balanced input)
100VRMS (100V
unbalanced input)
Signal to Noise
Ratio
>80dB (100VRMS output)
Input Impedance 60K ohms (balanced)
20K ohms (balanced priority)
100K ohms (100V unbalanced)
Channel
Separation
>70dB(1KHz)
Frequency
Response
80Hz-15kHz (±3dB normal operating conditions)
Total Harmonic
Distortion
< 0.3 % (1kHz normal operating conditions)
Up Speed
>29V/us
Priority
Threshold
>10mVp (prior balanced line input)
>1000mVp (prior 100VRMS line input)
Indicators "Protection", "Limit", "Voltage Limit", "Signal", and "70V gear"
Protection
Power
-
on, high temperature, DC, short circuit
Power Supply AC180-260V/50-60Hz
DC24V (rated output power-3dB)
Machine Legs Four 6.5mm high soft plastic machine legs, can be removed as
needed
Power
Consumption
300W 600W 1200W
Weight 6.7Kg 6.9Kg 7.3Kg
Dimension
(
L×W×H
)
483×435×44mm (not including machine legs)