Speaker Testing Solutions

Speaker, Driver & Cabinet Testing

The PureSound™ Speaker Test System is a comprehensive test solution with a unique and reliable defects analysis. The objective Rub & Buzz analysis correlates 100% to the subjective perception of the human ear. The typical cycle time for a complete speaker test is less than one second.

Key features for a modern, state-of-the-art test system are speed, simplicity, reproducibility and automation in a factory environment. The PureSound speaker test system exactly answers these needs. The key element is the unique Rub & Buzz defects analysis with a 100% correlation to the human ear. It replaces the subjective human ear perception against an objective, reliable and repeatable test feature.

The turnkey speaker test solution is provided by the FX100 and operated via the RT-Speaker PC software. It is optimized for high-volume quality control of single speaker components, pre-assembled parts or finished products.

Measurement Parameters:
  • Frequency Response
  • Distortion THD, THD+N, k2-k35
  • Impedance Response
  • Resonance Frequencies f0
  • Sound Pressure Level dBSPL
  • Speaker Polarity
  • Rub & Buzz defects analysis with a 100% correlation to the human ear
  • Thiele/Small Parameters
  • DC Resistance

Turnkey Solution

The design of the FX100 Audio Analyzer was influenced by the key requirements for production testing: Flexibility, speed and ease of integration.

Main Menu RT-Speaker Software:

RT-Speaker Software Main Menu


The scalable hardware concept allows customization of the FX100 hardware according to the individual requirements. Plug-in options offer full flexibility such as additional measuring channels, input and output switchers or impedance measurement modules. The audio analyzer grows with the application for manually-operated and fully-automated production lines.

Compact Power

The FX100 with the FX-SIP impedance module is a very compact loudspeaker test system. Plug in an M2010 microphone and all your hardware requirements are complete. No external amplifier is required.

Measurement Speed

Fast GlideSweeps obtain all relevant measurement results from one short stimulus; typically less than one second. The FX100 has been optimized for factory noise immunity and high volume production. The sequence mode provides automated measurement of customized test sequences including Pass/Fail decision.

Ease of Integration

The FX100 Audio Analyzer bridges the demands of QC engineering for using the same instrument in R&D, sample inspection and on the production floor. Individual application projects may be transferred around the globe for fast setup.

PureSound™ Speaker Measurement (optional)

Leading-edge measurement technology unveils the speaker parameters including Rub&Buzz with one single stimulus. The patented PureSound™ technology provides a complete speaker characterization with an unmatched correlation to the human hearing. Two speakers may be measured at the same time! PureSound™ includes the turnkey production software.


All measurement data may be logged for detailed manufacturing control. The built-in digital I/O interface connects to peripheral devices, such as a foot switch or a stack light.

PureSound Rub & Buzz Measurement

PureSound™ detects the slightest Rub&Buzz defects of speakers or transducers, such as air-leaks, uncentered coils, rubbing voice coils, loose particles and touching wires. The fastest and most reliable test results are guaranteed, even with high factory environmental noise. The typical test time is lower than one second, depending on the speaker type, frequency range and resolution. Make your business more successful by improving your product quality control and saving costs with PureSound™ Rub&Buzz testing.

FX-Control PureSound

FX-Control PureSound

Calibration and Recording of Reference Data

The main menu guides the production administrator through the basic system configuration on to the test parameter settings, which are contained in a single “Project“ folder. After an automated calibration sequence a representative set of one or more “Golden Samples” can be recorded.

The unique tolerance management derives its tolerance criteria automatically and supports up to five different quality clusters, which may be user-defined in any language, such as “Excellent”, “OK”, “Acceptable”, “Class 3” and “Reject”. The manufacturer may then, for example, charge a premium for “Excellent” products or match similar speaker pairs for stereo applications.

RT-Speaker Software Reference Mode

Speaker Production Testing

A simple PASSED/FAILED readout or a detailed view of all measured speaker parameters is provided to the operator. System integration into existing high volume production lines and the connection to host controllers is very simple. The patented measurement algorithms have been optimized for factory noise immunity.

Measurements can be started by an external button or automatically as the speaker is connected. The built-in FX100 digital IO interface can be used for automated operation, such as
  • Communicating with a PLC
  • Test result indication through a stack-light
  • Triggering a measurement with a footswitch
  • External pre- or post-test actions independent of test result
  • Automated splitting of PASSED/FAILED samples
  • Individual bin splitting of different FAILED samples

RT-Speaker Software Passed/Failed Testing

RT-Speaker Editions

Basic Edition
For companies that want to replace their subjective ”Golden Ear” test with a cost-effective, objective test system that creates consistent results. This edition contains the Rub&Buzz test that uses NTi Audio’s PureSound™ technology.

Standard Edition
Designed for companies who test smaller quantities of loudspeakers, such as R&D, sample QC testing or PA rental companies. While the Standard Edition still offers the complete set of measurement functions, the test system can only be operated in manual mode.

Premiere Edition
Contains the full RT-Speaker functionality and is therefore the optimal solution for testing mass production of loudspeakers. Besides the complete set of measurement functions, the Premiere Edition offers numerous helpful features for system integration such as digital IO, TCP/IP interfaces and barcode scanners. Various user access rights, a comprehensive statistic tool as well as the ability to classify results complete the list of features. 
   Loudspeaker Test Software including PureSound™
Measurement functions      
  • Automated calibration sequence
  • Reference measurement
  • PureSound Rub&Buzz Defect detection
  • Frequency response

  • Impedance response
  • Distortion response
  • Thiele/Small parameters
  • Multiple Resonance frequency readings
  • Multiple dBSPL readings
  • Multiple Polarity readings
  • DC Resistance
  • 2-DUT parallel measurement
  • Loudspeaker directivity (Polar plots)
  • Front panel PASS/FAIL indication
  • Temperature & Humidity sensor support
  • Barcode scanner support
  • Digital IO interface
  • DUT autodetect
  • TPC/IP remote control
  • Remote monitoring
  • Audio switcher support
  • Pre/Post test actions
  • Turntable support
 Data handling      
  • Data Logging
  • Golden Sample finder (BMA)
  • Serial number handling
  • Result classifying
  • Statistic package
  • Calibration manager
  • Project Backup/Restore
  • Project sequencing
  • User role management
  • Multiple cycles
  • Automated documentation
  • Customized reports


The results produced by each of the three software editions are fully compatible to each other. Every RT-Speaker project can be executed with each software edition.

All three editions also enable the PureSound Rub&Buzz defect detection in the FX-Control software.

Upgrade and evaluation licenses are available for all three editions.

Loudspeaker Directivity Measurement with the FX100

Introduction to setting up and operating a solution that measures the polar plot of a loudspeaker.

Order Information

Flexus FX100 Audio Analyzer

Speaker Test System for

High Volume and Automated Testing of Speakers < 30W
  • Flexus FX100 Audio Analyzer
  • Speaker Impedance Module FX-SIP (includes power amplifier)
  • Measurement Microphone M2010
  • Premiere Speaker Test Software
High Volume and Automated Testing of Speakers > 30W
  • Flexus FX100 Audio Analyzer
  • Speaker Impedance Module FX-SIH (requires external power amplifier)
  • Measurement Microphone M2010
  • Premiere Speaker Test Software
Manual Testing of Speakers < 30W
  • Flexus FX100 Audio Analyzer
  • Speaker Impedance Module FX-SIP (includes power amplifier)
  • Measurement Microphone M2010
  • Standard Speaker Test Software
Manual Testing of Speakers > 30W
  • Flexus FX100 Audio Analyzer
  • Speaker Impedance Module FX-SIH (requires external power amplifier)
  • Measurement Microphone M2010
  • Standard Speaker Test Software
Directivity Measurement of Lightweight Speakers and Devices
  • Flexus FX100 Audio Analyzer
  • Measurement Microphone M2010
  • Turntable TT01
  • Loudspeaker Directivity Option
  • Environmental Sensor
  • Precision Microphone Calibrator 94/114 dB
  • Auxiliary IO connection board
  • Stack Light (red/orange/green)
  • Footswitch
  • Rack Mount Set

Get more Information

I am interested: Contact NTI Americas

Reference Customers

18 Sound • 3M • AAC • ACO • AKG Acoustics • Amphenol • Atlas Copco Airpower NV • Audi AG • Audyon • Austrian Center of Competence in Mechatronics • Azden • Beyma • Blaupunkt • BMW Group • Bombadier • BYD • CableX, Slovenia • Clair Bros. • Continental Automotive GmbH • Cooper MEDC • DEKRA • Dynatech, China • e.solutions GmbH • ebm-papst • Edifier, China • Ehmann, Germany • Electrovoice (Bosch) • Eminence • EM-Tech, Korea • EuroTel, Italy • Fane • Ferrari SpA • Fischer Amps, Germany • Flextronics • Foster • Foxconn • Fuji Films • G+M Electronics, Switzerland • GE Wind Energy GmbH • Goertek • Hama GmbH & Co KG • Hamilton Video & Sound • Harman • Hi-P • Hochiki, Japan • Honeywell • Hosiden Besson Ltd • Hyundai Rotem USA Corporation • IATEC, Argentina • IMAX • Janus Donguan, China • Klipsch • KLM Group • Knowles • Lab126 • Laird • Laney, UK • Lautsprecherlabor Berlin • LOM • Maxim Semiconducters • Meyer Sound • Microsoft • Miracle, India • M-Microphone, Russia • Molex • Morel, Israel • Motorola • Multichoice, South Africa • Municipal Utilities of Düsseldorf • Munro, UK • Neutrik • Nokia • Nortel • Northrop Grumman • Osram • Panasonic • Perlos • Phoenix Contact Electronics GmbH • Plantronics • Polizei Basel-Landschaft • Porsche Engineering Services GmbH • Pulse • Rasco, Germany • Rode, Australia • Samsung • Sandia National Labs, USA • Sanken, Japan • Semco Maritime • Sennheiser • Shure Distribution GmbH • Sica • Siemens • Sikorsky Aircraft • Sipe • Skype Technologies OY (Microsoft Corp) • Sonavox • Sony • Tannoy • TCL-IMAX, China • Tokyo Acoustics • Tools4music • Vitus Audio, Denmark • Walton, Bangladesh • Western Australia Police • Wisconsin Department of Health WMHI • Yamaha Music (Asia) Private Limited • ZF Friedrichshafen AG

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