K551

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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.

Frequency response (tonal balance) is the most sound-determining aspect of headphones. A horizontal line shows audible neutral response in the plots on this website. Deviations in different severities at different frequency bands have an effect on the sound character.
The bigger the deviation the stronger the effect.

Below an aid to help determining the sound character of headphones with relation to the frequency response.

sound descriptions mine

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AKG K551

K551

The AKG K551 is intended for portable gear and has a remote control integrated in the cord (only for i-products) and a microphone.It has a good amount of bass, not accentuated and reaches as low as 5Hz (really). the uppermids/lower highs isn’t as good as I hoped it would be and the treble peak is noticeable, especially on recordings with distortion in it. left, right

l-r k551 stock

This headphone can be transformed into an exceptional performer with relatively little effort but some soldering skills are required (or ask someone to do it for you). The result of these modifications are shown below left, right.
HERE is where you can view/download the article that describes how to modify the K551. The felt discs for this modification can be ordered via the FORUM.

evo felt + low filter

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