Time Selective Response Sequence

This sequence demonstrates the capabilities of the TSR (Time Selective Response) algorithm in SoundCheck. Using TSR with a log sweep is a very fast and effective method for measuring frequency response and THD of a speaker in a non-anechoic environment. This example plays a quick log sweep from 20 Hz to 20 kHz. An analysis step then uses the TSR algorithm with time windowing to output frequency response, harmonics, THD, and impulse response curves.


2021 End of Year Promos

We have some amazing discounts to celebrate the end of 2021 and help you get more for your money.

Each of these will be launched on the scheduled dates; we are happy to provide quotes for these items ahead of the scheduled date, to enable efficient order processing. All offers expire at 5pm on December 31st. Please contact your sales engineer or email sales@listeninc.com with any questions.


Nov 29th26% off version upgrades (support contract purchase required)
Dec 6th26% off all additional modules
Dec 13thFree software upgrade from 2 to 8 channels when you buy an AmpConnect 621 ($1500 value)
Dec 20th26% off package upgrades (basic to advanced; advanced to complete etc)
Dec 27th26% off new Stereo Soundfield Parameters sequence

Note: offers cannot be combined with other discounts (e.g. quantity discounts).

2020 End of Year Deals

Pandemic, wildfires, murder hornets and more…. 2020 has been a memorable year for all the wrong reasons! However, let’s end on a positive note! To celebrate our 25th anniversary, and the end of 2020, we are offering 25% discounts on some of our most popular SoundCheck modules and products! There are 12 business days left until the end of 2020, and we have a different discounted product each day.

Here is the complete schedule:



Dec 15

25% off virtual instrument modules 

Dec 16

25% off Listen AudioConnect 4x4 (4-channel audio interface)

Dec 17

25% off Package upgrades - upgrade from SoundCheck basic to SoundCheck plus or SC plus to SC complete

Dec 18

25% off additional channels (appropriate hardware required)

Dec 21

25% off SoundMap modules

Dec 22

25% off Listen AudioConnect (2-channel audio interface)

Dec 23

25% off background noise sequence

Dec 24

25% off telecoms testing modules  (telephone loudness rating, Zwicker loudness, waveform filter, Active Speech Level)

Dec 28

25% off TSR analysis module 

Dec 29

25% off all NEW support contracts (system must not have an existing support contract in place). Requires upgrade to latest version, but we have end of year discounts on that too!

Dec 30

25%+ off all upgrades. Even bigger discounts to see out the year!

Dec 31

25% off all hearing aid and headphone test sequences

Full details of each offer will be in the daily emails.


Please note that all offers are subject to the following terms and conditions:

  1. Discounted price cannot be combined with other offers or discounts
  2. Max. quantity 5 per customer on hardware
  3. All offers expire Dec 31 2020; discounted prices will not be honored past this date.
  4. Prices exclude shipping, taxes and any applicable import duties
  5. Software upgrades and modules ship electronically, usually within 24 hours
  6. Credit cards may be used for purchases less than $5,000.



Test class


Testing Voice-Controlled & Smartphone Integrated Infotainment Systems

A tutorial and accompanying paper that was presented at the AES Automotive Conference, Sept 11-13, 2019, Neuburg an der Donau, Germany.

Voice-controlled and smartphone integrated vehicle infotainment systems are notoriously complex to test. They have numerous connections from wired to wireless and contain much signal processing, both on the record and on the playback side. This means that their characteristics change according to ‘real world’ conditions of the vehicle’s environment, including cabin acoustics and background noises from road, wind and motors. Furthermore, their multifunctional nature means that there are many aspects of the device that may need to be tested, ranging from voice recognition to music playback and operation as a hands-free telephone. Due to their complex non-linear use cases, these devices often need to be tested at different levels and different environmental conditions.

This tutorial offers practical hands-on advice on how to test such devices, including test configurations, what to measure, the challenges of making open-loop measurements, and how to select a test system.

Download presentation (slides)

Download accompanying paper

Triggered Record Using Chirp Trigger and WAV File (Version 17 and later)

This test sequence demonstrates SoundCheck’s Triggered Record – Chirp Trigger function for open loop testing of devices without analog inputs such as smart speakers, wearables, smart home devices, tablets and cellphones.  A stimulus WAV file is created in SoundCheck and transferred to the device under test, where it is played back and the response recorded in SoundCheck as if the stimulus were played directly from SoundCheck. The Acquisition step is triggered by the chirp in the stimulus file. Chirp triggers are more robust than level and frequency triggers which are susceptible to false triggering due to background noise.


TIA-920-B Sequence for Measurement of Narrowband and Wideband Digital Phones

This sequence tests to TIA 920-B, a comprehensive US dual-bandwidth standard that applies to both narrowband (NB) and wideband (WB) devices. It also allows a choice between Free Field (FF) and Diffuse Field (DF) as the Listener Reference Point (LRP). The current release of this sequence measures digital communications devices with handset features, according to TIA-920.110-B and speakerphones, according to TIA-920.120-B. Support for headset measurements, according to TIA-920.130-B will be added in a future release.

This module is a large structured set of sequences and subsequences which perform all the measurements. Curves and values are shown on the screen, tolerance checks are performed, and data is saved to Excel spreadsheet files. Completely prompted sequences for calibration of all the transducers are included. After a one-time setup with a sound card and other user-specific interfaces, the sequences are automatic. They run by simply selecting, pressing start, and following prompts where user interaction with the device under test is required. The sequence works with approved sound cards for connection to the transducers. Windows audio devices such as USB headsets work directly with SoundCheck®. VoIP softphones also work with SoundCheck, by means of a recommended third-party Windows audio application.


Korea Headphone Seminar

Over 150 people attended the Listen, Inc./G.R.A.S. headphone seminar in Seoul on Tuesday March 6th, where Steve Temme, Peter Wulf-Andersen, Dr. Sean Olive and Prof. Lee spoke to a packed room about headphone measurement, perception and design and tuning. It was a great event and exciting to meet so many of Korea’s top audio design engineers. Thank you for coming! And of course a huge thank you to our very special guest speakers, Dr. Olive and Prof. Lee.

Videos of the event (in English and Korean) can be viewed using the links below (videos will open in a new tab).

Peter Wulf-Andersen – G.R.A.S.: https://youtu.be/sTZpShVDaoI

Steve Temme – Listen, Inc.: https://youtu.be/35TtshAENdo

Prof. Lee – New Media Communication Joint Institute of Seoul National University: https://youtu.be/mhLW03PvLmw

Dr. Sean Olive, Harman International: https://youtu.be/B8cNf0Q3tNs

Photo Gallery

Headphone & Headset Measurements – Seoul, Korea – March 6, 2018

Presented by:



Due to popular demand, we are now holding our headphone testing seminar in Seoul!

Learn about the latest in headphone test systems and methods from design to EOL Test. Industry experts Steve Temme (Listen, Inc.) and Peter Wulf-Andersen (G.R.A.S.), as well as guest speakers Dr. Sean Olive (Harman International) and Prof. Lee (New Media Communication Joint Institute of Seoul National University) will discuss test equipment (ear couplers, test fixtures, test software and hardware) and demonstrate practical test setups for both R&D and QC headphone testing. It will cover in-ear monitors, Bluetooth, lightning/USB, noise-cancelling and high resolution headphones, in addition to conventional analog headphones. You can even measure your own headphone using our equipment in the hands-on session. Please see the full agenda below.

There is no charge for this one-day seminar. Space is limited, so please RSVP today.

Location and Dates:

Seoul: Tuesday March 6th, 2018. Korea National University, 1 Gwanak-ro, Gwanak-gu, Seoul.





See what people are saying about this event (we presented similar last year in the US)

Agenda (9am-4pm)

  • Introduction
  • Overview of Headphone Test Systems and tools
    • Traditional tools vs. modern consumer demands
      • Introduction to head and ear related terminology and definitions.
      • Historical perspective and background for the tools and standards used today.
      • Limitations vs. Possibilities in term of the measurement capabilities. How does that relate to the modern challenges with Bluetooth and ANC related testing tasks?
    • Tools for Next Generation Headphone Testing
      • Solutions to some the challenges addressed above.
      • Examples based on products and measurements.
    • What about frequencies above 20kHz? Science or marketing? Measurement Consistency – Development vs. Production
      • Progress in measurements from Head and Torso Simulator (KEMAR) to Production Test Fixture (45CC – flat plate). How the different components affect the measurements:
    • Software and hardware for headphone testing including typical headphone measurements and test setups
  • Practical examples of headphone measurements on.
    • Analog Headphones
    • Bluetooth Headsets
    • ANC Headphones
    • Lightning/USB Connected Headphones (using triggered recordings)
    • Hi-Res Headphones
    • In-ear monitors
  • Measurements including:
    • Frequency Response relative to a target response
    • Left/Right tracking
    • Impedance
    • Noise attenuation
    • Distortion including Non-Coherent Distortion
    • Standards including Max SPL EN-50332 & IEC-60268-7
  • Design & sound tuning of earphones  (Guest Speaker Prof. Lee, New Media Communication Joint Institute of Seoul National University)
  • Headphone Design: Perception and Measurement of Headphones – What is the Preferred Target Response? (Guest Speaker: Dr. Sean Olive, Harman International)
  • Hands-on testing: Bring your own device and test it using one of our measurement setups

Reserve your space