Reverberation is an effect when the sound from one source starts bouncing from other surfaces. The artificial head later measured frequency response, which listeners immediately liked.The room had around 0.4 seconds of reverberation time, close to 0.3 seconds of professional studios.It shouldn’t be too reverberant nor too anechoic. To place good speakers in a regular listening room.The reason is that none of them was created in a realistic listening environment. Sean Olive and his researchers said that both free and diffuse fields aren’t perfect for tuning headphones. One of Harman curve headphones are Samsung Galaxy Buds Plus. Therefore, tuning that is perfect for speakers isn’t ideal for headphones. Headphones only interact with the pinna and ear canal, while earbuds skip the pinna entirely and go straight into the canal. Therefore, even your torso can make you hear music differently than your friend. In extreme cases, there is a couple of dB difference from person to person.Īlso, sound, if not absorbed, reflects from other surfaces. Everybody has a slightly different pinna and ear canal, affecting how each induvidual perceives specific frequencies. Tuning headphones can be problematic due to human anatomy. However, when it comes to headphones, every company tuned their products based on what they thought sounded good. Harman had a mission to create a target frequency response measurement, which perfectly represents how quality speakers sound in an ideal room.Įven after extensive research of the past decades, audio engineers only knew how to tune speakers to sound flat. Most listeners prefer headphones tuned close to Harman curve. They tested both for in-ears and over-ear headphones since both require different tuning to provide similar results. The research involved extensive blind testing on various individuals trying out different headphones.īased on what they liked and disliked, researchers found and defined the most universally liked sound signature. It was published in “ The Relationships Between Perception and Measurement of Headphone Sound Quality” paper. The “curve” was created in 2012 by a team of scientists, with audio engineer Sean Olive overseeing the project. That’s why the Harman curve (also “Harman target”) is one of the best frequency response standards for enjoying music with headphones.Ĭompared to the flat response, the Harman curve has slightly elevated bass and treble (a few dB on each side, see the graph below). It shows the target frequency response of perfectly sounding headphones, what levels should be boosted, and which subdued (graph below). It’s a close representation of how quality speakers sound in an ideal room. The Harman Curve is the optimal sound signature that most people prefer in their headphones, as discovered by Harman International.
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