Pioneer dj hdj 1500 closed dynamic stereo headphones pioneer dj hdj 1500 s these stylish professional headphones have flawless sound reproduction and are durable enough to stand up to life on the road high quality components and innovative design deliver perfectly balanced sound across the whole audio frequency spectrum features large 50mm drivers with copper clad aluminium wire voice coils with rare earth magnets and 38microm thick diaphragms give accurate reproduction of low bass notes