A dummy's head with headset in a lab in Sunnyvale, California, is used to test sound quality for the new Dolby Voice service, which introduces surround sound to conference calls. - 2013
HEAD acoustics - News & Publications - News - HQS-ANC-Headset: HEAD acoustics' comprehensive test solution for ANC headphones and headsets
Original Philips SHP9500 High quality Sound headset noise reduction Earphones for Xiaomi Support official test|Headphone/Headset| - AliExpress