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Solutions from Laboratory to End-of-Line

GRAS offers a broad suite of ready-to-use acoustic test fixtures and ear simulator kits for headphone and headset testing. Together, they cover all testing needs in the complete development and production cycle – from early Research and Development (R&D) to Production Line (PL) and Quality Assurance (QA)/Quality Control (QC).







Test Stages

R&D

Research and development testing includes all testing from early product development over design for production until final manufacturing.

Developing new headphones and headsets is not only a question of great sound. Today, the list of requirements is long and complex: Voice recognition, noise cancellation, wireless and Bluetooth Functionality, virtual and augmented reality, etc.

On top of this, they must be fit for use virtually anywhere - and look great too.

GRAS test solutions for R&D cover the complete development process. We offer a wide range of test solutions, ranging from simple and easy-to-use table-top test fixtures (like e.g. 43AG), over state-of-the-art R&D test solutions with Head & Torso Simulators (45BB or 45BC), to production line test fixtures (45CC) that help verify the headphone can be/is produced within specifications.

Check out our family of ear simulators, including the new and improved 60318-4-based ear simulators capable of measuring high frequencies – up to 20 kHz and 50 kHz.

Read our customer case with Meze Audio on high-frequency testing using the GRAS RA0401 coupler here.

Watch the video on headphone testing solutions using the GRAS 43BB Coupler:

PL, QA and QC

Production line, QA and QC testing ensure that the actual production matches the target quality and that no sub-standard samples hit the market.

Test equipment must provide repeatable and precise measurements every day to ensure that headphones and headsets that do not meet specifications are not launched in the market.

The complexity of test setups increases as the number of features increase. Also, it is important to ensure the quality of the measurements: Data consistency and repeatability across multiple testing locations.

Downtime and low yields are no-go’s on production lines and this is why the products offered by GRAS for production line and quality assurance testing have been developed in close collaboration with leading companies in the global headphone and headset industry.

Check out our family of ear simulators, including the new and improved 60318-4-based ear simulators capable of measuring high frequencies – up to 20 kHz and 50 kHz.

Read our customer case with GN Audio on test solutions using GRAS equipment here.

Watch the video on headphone testing using the GRAS 45CC Test Fixture: 

Test Types

What type of testing are you looking for?

At GRAS, we distinguish between four test types: Standard tests, low-noise tests, high-frequency tests and hi-res tests. The standard tests do not allow for low-noise testing or testing at frequencies above 10 kHz, which is why we offer equipment for testing at high frequencies or low levels. In the following, we define what we understand by the different test types.

Standard Testing

Testing according to IEC 60268, IEC 60318-1, IEC 60318-4 and ITU-T Rec P.57, etc. For decades, these tried and tested standards have defined how testing should be done. However, improved products require improved testing methods. This is why we have developed several improved test solutions, including a number of improved IEC 60318-4 compliant or compatible ear simulators for low-noise, high-frequency and Hi-Res testing.

Low-Noise Testing

A low-noise system allows for testing down to or close to the threshold of human hearing, a must if you want to test for noise from the electronics of ANC and Bluetooth-enabled headphones. Low-noise testing is typically done in order to reduce unwanted hiss noise from the electronics which otherwise can only be identified by subjective listening. This is typically done in the early stage of the product development, the R&D phase. GRAS low-noise systems for headphone testing use an ear simulator similar to that described in 60318-4, but equipped with a low-noise microphone in combination with the 43BB Low-noise system.

High-Frequency Testing

We define high-frequency testing as testing up to 20 kHz. This can be done using microphone-based solutions or solutions with the improved 60318-4-compliant high-frequency ear simulator which is fully compliant with the standard but extends the frequency range to 20 kHz. Full IEC 60318-4 compliance, extended frequency range, improved distortion measurements, and improved repeatability make it a logical first choice when choosing an ear simulator-based measurement solution. This is why we recommend it as ”the new normal” - the natural successor to the well-proven 711 ear simulator.

Hi-Res Testing

Testing Hi-Res audio capable headphones requires solutions that can test up to 40 kHz and beyond. Test solutions with 1/4” microphones can be used, but solutions that present the test object with the acoustical impedance of a real ear below 10 kHz are often preferable. Our Hi-Res ear simulators offer realistic acoustical load of the test object, IEC70318-4 compatibility, improved repeatability, and a frequency range that goes to 50 kHz and beyond. The only tradeoff is lower sensitivity, and therefore an increased noise floor.