MrSpeakers Ether 2 – Leakage responses, right capsule 20 100 1k 10k 20k frequency (Hz) −30 −20 −10 0 10 20 d B > Reference Spectacles 'Hair' MrSpeakers Ether 2 – Leakage responses, right capsule i Most headphones depend to some degree on an effective seal to the head or ear by the earpads or, in the case of insert models, the flexible ear tips. If this seal is compromised – as it can easily be with over-ear headphones where the earpads seal against hair and the user may be wearing spectacles – headphone bass response will suffer. To test for this with over-ear models of headphone, frequency response measurement is repeated with the artificial ear fitted first with the temple arm of a chunky pair of spectacles, and again with the temple arm replaced by a hemp mat which has acoustic resistance similar to that of human hair. The effects of the temple arm and mat are illustrated by overlaying the frequency responses obtained with them in place on the frequency response from the uncorrected responses test, where the earpad rests on a flat, non-porous surface which is much easier to seal to. This graph shows the outcome using the right capsule and artificial pinna; a second graph shows the result for the left capsule/pinna. The measurement procedure is the same as that used to obtain the headphone's uncorrected frequency responses. Measurement parameters Test signal: Sampling frequency: Bit-depth: FFT length: Frequency resolution (measurement): Frequency resolution (graph): Reseats on the artificial ear: Measurement averages: Trace smoothing: pink-spectrum periodic noise 96kHz 16-bit 32,768pt 2.93Hz 1/100th octave 10 per condition 10 per reseat none Graph, data and logo: © Keith Howard, 2018-2019 < Back These windows support Pan and Zoom