HD25Sp has the same capsules as the HD25-1, so i guess the same applies. The HD25-1 blocks out a lot of noise, but it has some whirring and wind resonance when using them in the free air (on a bicycle) regardless of where the wind comes from. I'm hardly able hear car horns while music is playing, so be extra careful (same applies to HD280 here i think). It is easy to drown out most of the wind noise by increasing the volume slightly.
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