Frequency response is the most important part of a good audio reproduction. So although most listeners naturally compensate for variations in frequency response caused by their unique features, such as the shape and size of their heads, other factors like their preferred headphone position, and how the ear cups' acoustics interact with their ears may cause additional variations in the response. An inconsistent headphone may have a drastically different sound from listener to listener. This means a headphone that will sound bass-heavy for most could lack a lot of bass for listeners who wear glasses. The ideal headphone should consistently reproduce the same response whether open or closed-back and regardless of positioning or head/ear shape.
We evaluate the frequency response of our over/on-ear headphones by measuring them 5 times on the HMS (Head Measurement System) and 5 times on 5 human subjects. For in-ears, we measure them 5 times only on the HMS.
When it matters
For more information, check out our video on frequency response measurements, bass inconsistencies and target curves: