HD238

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NO SMOOTHING is applied to the shown plots. Most measurement sites have some smoothing applied which ‘irons flat’ sharp peaks and ‘wiggles’. I do not use smoothing because some info about sound quality is lost when plots are smoothed.

Aside from a small correction of the microphone itself also some correction in the lowest frequencies is applied to the plots to compensate for the perceived loss of bass when using headphones. This is described HERE in more detail.
A ‘horizontal‘ frequency response curve on the shown frequency response plots on this website thus indicates a perceived ‘flat’ tonal signature.

ALL measurements are made with a good SEAL on a flatbed measurement rig.
The
shape of your head, bone structure, pad size, pad ‘softness,  (compliance), hair or no hair and or wearing glasses may (drastically) change the frequency response of some headphones, so… your personal experience may differ substantially from these plots.

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Sennheiser HD238

DSCN2444

Another decent sounding on-ear headphone with a more luxurious fit and finish and higher price tag is the Sennheiser HD238. The graphs from the version below is modified, the removable foam piece in the earpads has been replaced by dense packed dot of natural wool (straight from a sheep but washed it first !). a Warmish sound with highs that are quite present. The peak at 3kHz is narrow and gives it everything a bit of an ‘edge’ to it, sometimes this is welcome, sometimes it’s not. The drop-off above 14khz is not very obvious but does make it sound somewhat less ‘airy’. Left, Right. Channel matching is excellent ! 

HD238 FR 30kHz

Below the distortion plots of the HD238:

DIST HD238 L

The distortion is quite high and is partly responsible for the ‘fat-ish’ bass reproduction.

CSD below shows some around 3kHz ringing which is not as bad a s it seems as our ear canal resonates also at this frequency so the brain tends to ignore slight ringing in that area of the frequency range. Left, Right superimposed

CSD HD238

Below the squarewave and pulse response plots of this headphone.

HD238

An enjoyable but slightly ‘coloured’ headphone. Not coloured in an annoying way though. Do bear in mind that the plots above are NOT from an entirely stock HD238 !

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