K550

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post separation

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

post separation
AKG K550

K550

The AKG K550 exists in a few ‘versions’ it seems. The ones that have a sharp edge and some that have a much less sharp edge. This particular one seems to be one of those with a less sharp edge but it is still there as can be seen in the plot below. left, right

K550 stock

The CSD below shows quite good behaviour below3kHz but above that point there is some ringing visible.

k550 csd r

When the same modifications are done as described in the K551 article below the frequency plot is changed to this: left, right

K550 modified version

k550 modified csd l
The CSD is also a little cleaner.

post separation

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