A hat-trick of staff from Media Technology went up to G.R.A.S. Sound in Vibration in Bedford yesterday (15/05/17) for a series of seminars on headphone and headset measurements. Matt, Lee and Paul attended sessions on headset test systems and tools, learning about the latest improvements to ear couplers and anthropometric pinna. They saw a range of their tests fixtures from the fully-fledged KEMAR Head and Torso Simulator (HATS) – aimed at research and design applications – to simple flat-plate systems for checking consistency in production lines. It was a great opportunity to see some technical data on the systems and understand how they relate to current standards. There were interesting discussions around testing Bluetooth and noise cancelling headphones as well as the importance of phase response and filtering in high resolution audio.