High resolution audio is quickly becoming an important market driver in personal audio. But it has always been challenging to get repeatable and consistent data in the full audible range. Previous objective measurement methods have had limitations in the frequency response above 10 kHz and have often been based on human “golden ears”. Therefore GRAS has developed the new High Resolution Ear Simulator, which offers a precise method for measuring up to 20 kHz.
Obsessed with sound quality
Meze Audio was founded in 2009 and has quickly become a state-of-the-art manufacturer in the market for premium hi-fi headphones, having received several awards for their “99 Classic” headphone. Designing and manufacturing hi-fi headphones require balanced frequency response, effective noise isolation and headbands neither too tight nor too loose. These are all essential factors, which Meze Audio takes into consideration. When asked about the reason for their rapid success Antonio Meze, Chief Designer and Founder says: “We build high-end headphones, so we are obsessed with sound quality. We do not follow trends or let them influence the audio quality or design of our products.”
Fine tuning headphones at upper frequencies
With the new High Resolution Ear Simulator, GRAS RA0401, GRAS has changed the common perception of what is measurable, by extending the upper frequency limit. This makes it possible to make objective and quantifiable assessments of the performance of headphones up to 20 kHz. For Meze Audio, reliable and repeatable high frequency data based on a “humanlike” in-situ test method is a key parameter. “We are using the 45CA Headphone Test Fixture from GRAS every day in our sound lab for final testing of our headphones. With the 45CA and the new Hi-Res
Ear Simulator we are able to better correlate the high frequency measurements with what our subjective listening impressions tell us” Mircea Fanatan, Managing Director at Meze Audio, explains.
Improved sealing on supra-aural and circum-aural headphones
At GRAS we have made subtle but important changes to our anthropometric pinnae, providing significant improvements in the fit, placement and seal. According to R&D Project Manager Morten Wille at GRAS, this is in particular relevant to better mimic the way the human ear collapses when supra-aural and circum-aural headphones are mounted. When measuring the frequency response of these types of headphones, more reliable and repeatable measurements can be achieved because of the improved collapsibility of the pinna. “The anthropometric pinna enables us to improve the sealing of our headphones, providing us with repeatable and consistent measurements” Mircea Fanatan elaborates. For Meze Audio the combined advantage of the 45CA, the anthropometric pinna and the High Resolution Ear Simulator provides them better test results in the audible range and a significant improved sealing on their headphones.