I, like plenty of other peeps, bought these to finally give my KSC-75s a headband. Surprisingly they also came with a (cheap) 3.5mm to 1/4" adapter... But how do they sound? Who cares, but here it is anyway.
SoundDefinitively no low to mid bass emphasis what-so-ever. I wouldn't call it neutral, natural, ethereal, boomy, or muddy... Just spiritual. If your music is heavily distorted in the lowest registers, these cans will provide a permanent solution. Only the upperest bass will come through with a delicate "tuplrr-tuplrr".
The cans are definitively coloured. Voices and instruments are rendered as if coming from a world class music hall, bathroom. Something happened in that bathroom, and copious amounts of Febreze is not going to help. Plankton? Nope. Krill? Nope. But there is shrimp with lots of sauce. Brutal kilodynamics.
The treble is fairly well extended. They pass air. A little emphasized in the mid-highs, but not ear destroyingly so.
ComfortThey are pretty light. The driver is however unusually small, and may or may not get too intimate with ones ears.
PresentationCheap. The headband is also pretty cheap.
Price$2. Proly better (or not) than
Conradz NW-Studios,
Polk Ultrafit 500 and some others... But make no mistake, these are

. Bought these for the cheap-band anyway.
Overall
Some observationsAs said before, the drivers are fairly small and the impedance seems to resonate between 200 and 300 Hz which might be on the high side. The open design might not be the most adequate, and covering the cans with my hands seems to improve sound quality. With the proper housing, these may (or may not) make a reasonable over-grown ear-bud.
MeasurementsFrequency Response

Distortion Right

Distortion Left

CSD Right

CSD Left

Impedance
