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SoundEar 3-320 Noise Processor

SoundEar 3 Noise Processor
SoundEar 3 Noise Processor
SoundEar 3 Noise Processor Connections on the Rear

Price List

AUD $1980.00
SoundEar 3 Noise Processor
In stock

AUD $665.00
Sound Level Calibrator - Class 2
In stock
AUD $9601.00
Five Noise Processors and one Noise Meter
In stock

AUD $18212.00
Ten Noise Processors and one Noise Meter
In stock
AUD $699.00
Microphone and preamplifier for SoundEar 3
Lead time 1 week

AUD $57.00
5m Microphone Extension for SoundEar3
In stock

AUD $69.00
Power Supply for SoundEar 3
In stock

AUD $91.00
Medical Power Supply for SoundEar 3
In stock

AUD $69.00
Power supply with 24V DC output
In stock

AUD $24.00
DC power extension cable 10m (32ft) for 24V power supply
In stock

The delivery price is calculated during checkout based on your location and the goods ordered. Our basic delivery prices are:

Delivery within Australia: $48.00

Delivery Service: Five working days*

* For products that are in stock and the order received by midday.

Some products go through a final configuration and calibration before being shipped. If the calibration labs are busy this can add up to two days on to the delivery schedule but guarantees a fresh calibration.

AUD $1980.00
SoundEar 3 Noise Processor
In stock

AUD $9601.00
Five Noise Processors and one Noise Meter
In stock


  • Minimal or no display of noise levels
  • Long term sound level monitoring via USB memory stick
  • Link to your monitoring or process control system (DC or current loop output)
  • Unobtrusive
  • Large, expandable memory
  • Calibration can be checked with 1/2" calibrator
  • Weatherproof outdoor version available


  • Factories and other industrial sites
  • Hospitals, libraries, schools
  • Open plan offices
  • Entertainment venues


The SoundEar 3 Noise Processor mounts on the wall to monitor and record the sound levels. The digital display usually shows the current sound level, but this can be switched off or even set to display the time.

The SE3-320 Noise Processor is part of the SoundEar 3 range of products. It is technically identical to the SoundEar 3, but without the large green/yellow/red light-up display.

Its purpose is to continuously monitor the sound levels, recording the sound level for download to a computer via memory stick. It can also be linked directly into an existing process control system via the 4-20mA Current Loop or the DC output.

Data Logging

The SE3-320 Noise Processor has a large internal memory, to which it can store various sound level parameters every second. It can store the Fast or Slow sound level with "A" or "C" frequency weighting. You can select whether it stores all of these parameters or just the ones you need. When you plug a memory stick in the SE3-320 will automatically transfer the measurements on to it. You then plug the memory stick into your computer to load the measurements into the SoundEar software.

The Noise Processor's internal memory is large enough for more than 18 months storage without download - although of course we would recommend regular download to avoid data loss.

Connect to Process Control Systems

The SE3-320 can be linked in to existing monitoring and process control systems, or you can develop your own monitoring system, using either the DC output or Current Loop output.

4-20mA Current Loop

This is a standard method of electrical signalling, used by many process control systems, with the benefit that the signal is not degraded by voltage drops in the wiring. For more information please visit the Outputs page.

0-10V DC Output

The DC Output from the SoundEar 3 Noise Processor provides the measured sound level over a range of 0 to 10V DC, which can be measured using a basic A-D converter. For more information please visit the Outputs page.


The digital display on the SE3-320 usually shows the current sound level, updating every second. However, it can be set to any of the following:

  • Slow sound level, dB(A)
  • LAeq,1s
  • Time
  • Off (display is blank)

Turning the display off or displaying the time can be useful if you don't want to show the sound level in decibels.

Noise Monitoring Applications

The SoundEar 3 Noise Processor (order code SE3-320) is for long term noise monitoring in areas where you don't need the clear noise warning that is provided by the other SoundEar Noise Warning Signs.

Indoor Noise Monitoring

For the long term monitoring of noise levels in:

  • Hospitals, libraries, schools
  • Open plan offices
  • Factories and other industrial sites
  • Entertainment venues

When downloaded to a computer you can easily identify the noisy times of day and the limits reached.

Outdoor Noise Monitoring

The weatherproof version, order code SE3-320W, is protected against the weather and dust, rated to IP65. It can be mounted to a wall outside with four screws. A 10m (32 ft) power cable is included, to connect to the indoor power adapter that is also included.

More information on the Outdoor Noise Processor page.

Process Control Systems

Many process control systems can accept analog signals meeting the 4-20mA current loop standard. The standard SoundEar 3-320 (order code SE3-320) has two 4-20mA current loop outputs, which can be configured using the software included.

There is more information on the Outputs information tab.

Integration with Other Applications

The SoundEar 3-320 Noise Processor has two DC outputs that can be used for integration with your own applications. Typically connected to an A/D converter, the sound levels can be monitoring continuously.

For more information about the DC voltage output, please visit the Outputs tab.


The SoundEar 3-320 is usually wall mounted, using the mounting plate and security screw that are included. As long as there is a power outlet nearby and a surface that can accept four mounting screws, there are few limitations on the physical location of the device. The most important consideration is that it is in the most suitable position to measure the noise levels.

The installation consists of the following steps (also covered in the user manual):

  • Remove the mounting plate from the back of the SoundEar 3-320
  • Fix the mounting plate to the wall with four screws
  • Hang the SoundEar 3-320 on to the mounting plate
  • Insert the security screw to stop the monitor being easily removed
  • Plug in to the power outlet

An optional microphone extension cable can be used to mount the microphone away from the unit itself.


The SE3-320 comes complete with a power adapter. This provides the safe low voltage that the noise sign requires.

power adapter

Extension Power Cable - The power adapter that is included uses a 5V USB style cable. This is convenient as both power supply and cable are readily available if they need replacing. However, USB cables are not suitable for more than a few metres. If you need to run power for a longer distance then you need the PSU24DC power adapter with one or more POWEX10 extension cables.

Power for Current Loop or DC output - If you intend to use either the Current Loop (4-20 mA) or the DC (0-10V) output then the SE3-320 must be supplied with 24VDC. The optional PSU24DC power adapter provides this.

Mounting the SoundEar 3-320

remove security screw
Remove the security screw
remove mounting plate
Remove the mounting plate
fix mounting plate to wall
Fix the mounting plate to the wall
mount soundear 3-320 noise processor
Mount the device and fit the security screw

Noise Processor Software

The SoundEar 3-320 Noise Processor comes complete with software to configure, download and display the results.

  • Display live results (USB connection)
  • Configure the data logging settings
  • Download measurements

The outputs can be configured to:

  • 4-20mA current loop or 0-10V DC output
  • Sound level, frequency weighting, etc.

The software is included with the SoundEar 3-320 at no extra charge. It is designed for all recent versions of Windows. It communicates with the noise processor via the computer's USB port. Downloads and configuration can be carried out via a memory stick, so you don't have to take the processor down from the wall each time.

Live and Historic Measurements

With a SoundEar 3-320 connected to the computer's USB port, the software can show the sound levels in real time.

To download historic measurements it is not necessary to connect the processor to the computer. You can plug a standard USB stick into the sign and it will automatically transfer all its measurements. With the memory stick connected to the computer the SoundEar software will now download the measurements. In the image above you can see the sound levels graphed over a 24 hour period.

Analog Output

Using the software you can set the output from the sign to be either a DC level (0 to 10V) or current loop (4-20mA) for integrating into other logging and monitoring systems. You can also set the minimum and maximum sound levels that are then mapped onto this DC or current loop output. For more information, please visit the Outputs tab.

Data Logging Settings

The SoundEar 3-320 stores noise measurements in its internal memory. You can configure it to store a minimal amount of information for longer, or to store everything for a shorter period of time. For example, storing the "A" Weighted Slow Sound Level every second will fill the internal memory in just over 90 days.

noise processor software
Noise Processor Software

Digital Display Settings

The SoundEar software can configure the sign's digital display to show:

  • Slow Sound Level dB(A)
  • LAeq,1s (1 second LAeq)
  • Alarm Level
  • Time
  • Nothing (the digital display will be off)

Although the default is to show the sound level, it can be useful to turn this off if it causes confusion (not everybody understands dB) or if it causes people to make noise to see how loud they are!

Microphone Calibration

If you have a Sound Level Calibrator and need to ensure the accurate operation of the SoundEar 3-320 then the software deals with this. Connect the SoundEar 3-320 Noise Processor to the software, connect a microphone extension cable and fit the calibrator to the microphone. The software Microphone Calibration option will then deal with the process of checking and adjusting.

Noise Processor Outputs

The SE3-320 Noise Processor has two outputs available. These outputs can be configured to either:

  • DC Output 0 to 10V for monitoring using an A/D converter
  • Current Loop 4-20mA for integration into a process control system

Each of the outputs can be configured to provide:

  • Fast Sound Level dB(A) or dB(C)
  • Slow Sound Level dB(A) or dB(C)
  • Leq 1 minute, Leq 15 minute or Leq 60 minute

The range of dB measurement covered by the DC voltage or 4-20mA loop is set using the software.

noise processor settings
Setting the Outputs from Software

Power Requirements

The SoundEar 3 Noise Processor comes with two powering options: USB (5V) or 24VDC. When using the current loop or DC output the unit must be powered by 24VDC, it will not work with the USB power option. For convenience, the 24VDC power connections are on the same connector as the current loop outputs and ground.

Connecting Up

At the rear of the noise processor there is a connector block. This connector pulls out of its socket and contains screw terminals to connect the following:

  • 24VDC Supply
  • Current Loop or DC Output 1
  • Current Loop or DC Output 2
  • Output Ground (common to both outputs)

Current Loop 4-20mA Output

The Noise Processor includes standard 4-20mA Current Loop outputs. These provide a signal that does not degrade due to resistance, allowing for longer cable runs, limited by the ability to drive the current.

  • Selectable dB measurement range
  • Select Fast/Slow, Max or Leq for output
  • Periodic Leq output option

DC Output 0-10V

The Noise Processor also includes DC Voltage Outputs that are proportional to the measured sound level. They are ideal for level recorders and input to data logging systems.

Two Outputs

There are two current loop / DC outputs on the SE3-320, so you can select two different parameters to monitor. Both outputs are set to the same measurement range, but you can select different parameters, as described below.

Output Parameters

Each output can be one of the following noise measurement parameters:

  • LAFmax (maximum Fast sound level)
  • LASmax (maximum Slow sound level)
  • LAeq,1s (average sound level every second)
  • LCpeak ('C' weighted Peak)
  • LAeq,15 (average sound level over 15 minutes)
  • LAeq,30 (average sound level over 30 minutes)
  • LAeq,60 (average sound level over 60 minutes)

Measurement Range

The overall measurement range of the Noise Processor is 30dB to 120dB. You can process this whole range over the current loop or DC voltage output, or you can select the range of interest.

Purchasing Options

The standard SoundEar 3-320 order codes (SE3-320 or SE3-320-x for multi packs) include everything needed for most applications:

  • SoundEar 3-320 Noise Processor
  • Plug-in Microphone
  • Software
  • Power Adapter

Multi Packs

The SE3-320-x Multi Packs include all these items for each SoundEar 3-320. They also include an NM102 Hand Held Sound Level Meter, which can be used for making quick measurements of sound levels in the surrounding area, and can be helpful when setting the noise processor up.

Single Noise Processors and Multi-Packs

Order Code
SE2-320SoundEar 3-320 Noise Processor
With data logging and 4-20mA current loop / DC output. Includes microphone, power adapter and software.
SE3-320-5Pack with 5 Noise Processors and a Sound Meter
This package includes five SoundEar 3-320 processors and a hand-held sound level meter.
SE3-320-10Pack with 10 Noise Processors and a Sound Meter
This discounted package includes ten SoundEar 3-320 processors and a hand-held sound level meter.

Options and Accessories

CR514Sound Level Calibrator
A Class 2 calibrator for checking the function and accuracy of the noise processor.
PSU24DC24VDC Power Adapter
The SoundEar can also be powered by 24VDC. This is needed for the POWEX10 power extension cable.
POWEX10Power extension cable 10m
Working at a greater distance from the power outlet. Requires the 24VDC Adapter (PSU24DC) - does not work with standard power supply.

Technical Specifications

Frequency Range20Hz to 20kHz
Measuring Range30 to 120 dB
Deviation± 0.5 dB
Frequency Weighting"A" ("C" weighted Peak)
Time WeightingFast and Slow
Digital DisplaydB(A) Slow, LAeq, Alarm settings, Clock
Outputs"A" weighted, 0-10V or 4-20mA
USB Ports1. Micro USB (power and PC connection)
2. USB Controller (for USB memory stick connection)
Internal Memory16MB (128MBit) - 600 days
CabinetShockproof acrylic
Dimensions121 x 149 x 43 mm, 4.8" x 5.9" x 1.7"
Weight470 g, 1lb 6oz
Power5 VDC (micro USB) or 24 VDC (screw terminal)
Max 2.5W
noise processor dimensions
Noise Processor Dimensions
Acoustic StandardsIEC61672-2-2002 Class 2, ANSI S1.4 Type 2
Medical Standards
with P-SE3-MED adapter
60601-1: Medical electrical equipment
Part 1: General requirements for basic safety and essential performance.
60601-1-2: Medical electrical equipment
Part 1-2: General requirements for basic safety and essential performance.