GRAS Technical Notes and Application Notes

Audio Precision Tech Notes

• List of Audio Precision Tech Notes

Audio Precision Application Notes

• Loudspeaker Rub and Buzz Measurements

• Automotive Audio Amplifier Testing

• Smart Speaker Acoustic Measurements

• Loudspeaker Electroacoustic Measurements

• Headphone Electroacoustic Measurements

• Dolby MS11 Compliance Testing with APx500 Series Audio Analyzers

• AP Applied: Ultra-High Bandwidth Analysis

• AP Applied: Acoustic Response

• AP Applied: Digital Protocol Analysis

• AP Applied: Serial Digital Measurements with APx

• AP Applied: APx Automation with LabVIEW

Books and White-papers

• Class D and Linear Power Amplifier Testing

• Fundamentals of Audio Test

• Understanding PDM Digital Audio

• Building Analog in the 2010s

• Testing Broadcast Audio Consoles

• How to Write (and Read) Audio Specifications

• The Audio Measurement Handbook

• Appnote 5: Measurement Techniques for Digital Audio (Julian Dunn)

• Limitations in making audio bandwidth measurements in the presence of out of band noise

• Measuring Switch-mode Power Amplifiers

GRAS Technical Notes and Application Notes

• Microphone vs Pressure Sensor, September 2021
• How to Match a Measurement Microphone to a Sound Field, April 2021 
• Headphone Electroacoustic Measurements, November 2020
• Loudspeaker Electroacoustic Measurements, November 2020
• 147AX Positioning Guide, October 2020
• Improved Measurement Procedures for Engine Noise Reduction with Advanced Microphones, May 2020
• 147AX Microphone Vibration Sensitivity, April 2020
• Engine Bay Measurements: Pressure vs Free-field Microphone, April 2020 
• RA0357 Random-Incidence Corrector for 146AE, May 2018
• High Resolution Testing with 45CC, March 2018
• Periodic Verification of Measurement Microphones, April 2017
• Measurement of Impulsive Noise, April 2017 
• Windscreens – Practical Guidelines for Acoustic Measurements in Situations with Wind Flow, May 2016
• Acoustic Test Fixtures for Hearing Protectors, January 2015 
• Measurements in Boundary Layers, January 2015