HD25-1

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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 HD25-1

DSCN2468

This is a professional headphone that is used very often by sound engineers and sometime by DJ’s . It has good isolation due to it’s clamping force but after one or more ears your ears might start to hurt because of the high pressure on the ears. It is a plastic headphone and looks a bit flimsy but in reality is VERY sturdy and can take some beating. Only the headphone cord is a bit questionable. Just like the HD215 one earpiece can be rotated so it can still be firmly on the head with one ear ‘free’. I know it is held in high regard by some circles in the hi-fi circles but honestly don’t get this at all. The comment I often hear it is good for Rock is true though but don’t see it as valuable for other genres. It sounds a bit ‘dirty’ and very ‘forward’ which is good for rock and vocals. It is very suited for monitoring though due to it’s excellent isolation and speech is very ‘real’ so great for interviews e.t.c. The cable is bit mircophonic. The overall sound is dominated by realistic mids and ‘present’ bass. If the area around 150 Hz is EQ’ed down by a good 5dB it sounds a bit better though. Bass is tight and goes quite deep. Above 4 kHz the highs get a bit ‘gritty’ and the peak around 9kHz isn’t helping here at all. The sharp drop-off above 13kHz is responsible for the lack of ‘air’ and details aren’t really there.

sennheiser hd25-1

CSD shows good behaviour up to 2.5kHz above that part resonances (short lived ringing) starts to appear at 4kHz, 5kHz and between 7khz and 10kHz. This together with the drop off and peaky behaviour is responsible for the somewhat ‘coarse’ highs.

sennheiser hd25-1 wf-r

Recommended for monitoring, vocal and rock music and perhaps when you need good isolation or when you want the headphone to remain on your head while jogging perhaps. Wouldn’t use it to enjoy some classical music. A bit overblown but ‘good and tight’ sounding bass. A bit too little for bass-heads though. It’s only real downsides are the quality of the highs (not smooth/velvetty)  and the clamping force.

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