AKG K400

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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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AKG K400

AKG K400

The AKG K400 is a very comfortable headphone. The elastic bands that pull down the headband do wear after time and need to be replaced sooner or later. It has the familiar AKG look and is simple and elegant. The pads are cloth instead of pleather or velour and very comfortable for longer listening sessions. It is an open headphone design and sounds from the outside enter almost unattenuated. People around you can hear what you are playing.

It sounds quite good. Bass is tight but lacks ‘body’. There is no bass extension at all and sounds ‘lean’ compared to other headphones. With some music this isn’t very obvious but with well made recordings the lack of bass extension is obvious. Tonal balance is very good, instruments and voices sound very convincing. The treble peak is there and it makes the K400 sound detailed yet lacking finesse. Compared to better headphones the treble has some ‘spike’ to it and accentuates attacks with some instruments in a slightly artificial way. left, right

AKG K400 L+R

NOTE:
This headphone does start to distort at higher listening levels much sooner than most other headphones.
While it did have an edge to it at normal listening levels (around 80dBA) it certainly did not sound as bad as the measurements would suggest.

The CSD shows the 7kHz and 13kHz peaks to be the result of resonances, the 7kHz one quite severe even. The peak in FR and ringing may explain the ‘edge’ in the treble and the somewhat artificial sound on cymbals etc. Below 5kHz everything seems quite good. left, right

CSD AKG K400 L+R

The positives are a neutral sound, no muddy-ness and good comfort.
Negatives are the lack of body (bass extension) and the slightly ‘edgy’ treble.

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