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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

post separation
Jays V-Jays

DSCN2432

The Jays V-Jays is a very light weight and fold-able portable headphone with a high sensitivity. This means it plays pretty loud even on the ‘pinched’ European portable players. The impedance is around 24 Ohm. The V-jays has decent lows for such a small ear-pad headphone but alas the wider peak(s) between 2kHz and 6kHz make it a bit on the bright side while the mids and lows sound rather good. It is also quite obvious that while the bass extension is decent the roll-off above 10kHz makes it lack ‘air’ and finer details. The fact that the highs between 2kHz to 6kHz are elevated ‘masks’ this drop-off in the top end a bit. It also makes the highs sound a tad grainy but adds a sense of ‘fake detail’ where certain instruments sound a bit ‘over the top’. Below the FR plot of the Jays V-Jays (the smaller brother of the C-Jays)

VJays stock 30kHz

The highs extension can be lifted a bit by making a passive filter that effectively drops everything below 10kHz by around 5dB and thus let’s the highs above 10kHz pass unattenuated. THIS filter makes the headphone a bit smoother sounding in the highs with slightly more details and ‘air’ but at the expense of 5dB in SPL. Because the efficiency of this headphone is rather high this is not a problem but 5dB is more than just noticeable.

While the top-end extension is lifted by a quite noticeable 5dB’s the peak in the highs is still there. The comfort of the square earpieces with the very thin foam padding is far from comfortable and pokes in my Pinnae on its corners so experimented with HD25 velour pads mounted on foam rubber pieces to fill the rather big gap that would otherwise be there. A Picture of the pads and foam rubber inserts is shown below.

The FR  becomes becomes skewed to a darker sound and the peaky highs are gone. It has become a ‘darker’ sounding headphone with deep lows and subdued highs. The FR plot below shows the headphone with the HD25 pads on it (no filter in-line).

VJays HD 25 30kHz

Adding the earlier described FILTER but with different value components lifts the highs again to a more realistic level. The small dips at 3kHz and 10kHz are small resonances in disguise but because they are dips they are not very obvious. There is some differences between the left and right driver indicating there is some production spread. The frequency response has become quite ‘flat’ and the peaky highs and sometimes ‘screamy’ treble is replaced by a very non fatiguing sound. With a usable frequency response of 30Hz to over 20kHz this headphone is surprising to say the least.

It can easily compete with Koss Porta Pro/KSC35/KSC75 but cannot touch the likes of DT1350 which is much more forward  en ‘open’ sounding.The V-Jays with HD25 pads and obligatory filter can be called polite and ‘warm’ sounding with no traces of sibilance but also not as ‘lively’ sounding as in stock conditions. Before one asks… The filter components for the HD25 padded version differs but the schematic is the same. The resistor must be increased from 18 Ohm to 33 Ohm, the capacitor must be increased from 2.2uF to 6.8uF.

Distortion plot of the stock V-Jays is shown below:

DIST Vjays stock

Somewhat high 2nd harmonic distortion indicating a non-linear transducer. The excursion to the front and back are not the same.

Below the distortion plot of the V-Jays with HD25 pads fitted: Pretty much the same results up to 1kHz, just slightly better above.

DIST Vjays HD25

The CSD (left channel) shows some slight ringing around 1.8kHz, 3kHz and 5.5kHz.

CSD VJays

Below the CSD of the same headphone but with the HD25 pads mounted (no filter)

CSD VJays HD25

The 3kHz ringing is still present but not that audible. The reduced peak at 5.5kHz makes the headphone a lot more pleasant to listen to.

Below the squarewave response plots of the stock V-Jays headphone.

Vjays

These plots are actually one of the best ‘responses’ of stock headphones I measured.

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