We measured and compared the frequency responses of the main mixing headphones on the market. Measurements were made using G.R.A.S 45CC using IEC 60318-1 ear simulator and Dewesoft AD conversion Sirius system.
THE MEASUREMENT PROCESS
David will guide you through the process of measuring every single headphone at OLLO Audio. Dive in!
• 0:26 – Standard IEC 60318-1 and
equipment we use
• 1:12 – How we approach measurements
• 1:37 – Measurement process
• 3:16 – How can you get frequency response graph?
• 3:54 – What it all means?
g.r.a.s. and dewesoft
After thorough research and advice from Bang & Olufsen, we went for G.R.A.S 45CC using IEC 60318-1 ear simulator and Dewesoft AD conversion Sirius system. This is a gear used in top research labs like NASA, CERN, Mahle Sound and vibration labs, Spacelink, Airbus, SpaceX, Yamaha, and others.
SCIENCE OF MEASURING HEADPHONES
Headphones can't be measured with standard measurement microphones. They have to be measured like they are used - coupled to a microphone that mimics the acoustic characteristics of the ear. So when we measure a headphone, we are trying to mimic what the eardrum hears.
Flat sound in the free field is not flat by the time it gets to your eardrum. This difference between the flat sound in the free field, and the EQ of the sound you hear at the eardrum when you stick your head in the sound in the free field, is called the Head Related Transfer Function.
LINKS FOR ADDITIONAL RESEARCH:
👉 Journal of Neuroscience: The Encoding of Sound Source Elevation in the Human Auditory Cortex
👉 Innerfidelity.com: Headphone Measurements Explained - Frequency Response Part One
👉 Innerfidelity.com: First Test of Estimated Harman Target Response Curve on Various Headphones
HOW CAN MEASUREMENTS HELP
To be able to use measurements in an efficient way, the printed version that comes with the package is not enough. You need to get a curve you can inspect in depth. Measurements for the headphones bought before April 2020 are available in your account. For orders after April 2020, please request measurements via HelpDesk. An excel file will be sent to you, which will provide data for your specific headphones.
TRY BEFORE YOU DECIDE
S4X reference headphones
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