(Based on 
Foldable, closed-back professional headphones featuring natural surround sound and aluminum nameplates.
The Ultrasone PRO 550 are foldable, closed-back professional headphones with aluminum nameplates. Includes PRO Box (hardcase) for safe transportation and storage, including accessories. Technologies: S-Logic Natural Surround Sound, MU Metal shielding (ULE-technology), safer hearing.
Character
The PRO 550 are professionally designed and equipped headphones. Detachable cables, extra cable, speed-switch earpads, a spare pair of earpads, hardcase for storage and transportation, and many more details meet professionals´ needs. The 50mm heavy-duty driver produces an imposing sound intensity. Tight and powerful bass plus precise and detailed instrument placement are delivered. Combined with all useful accessories included in the PRO hardcase, the closed PRO 550 finds fans among bass players and drummers. Due to requests, Ultrasone implemented an additional function which enables you to fold these headphones easily.
ULE-technology & PRO design
PRO headphones have Ultra Low Emission (ULE) technology with significant benefits for professional users. PRO headphones also have a unique design; the PRO appearance not only distinguishes the professional line but also allows a higher degree of transparency in combination with the spatial sense and understanding, due to more ear anatomy area.
To understand what ULE-technology does, you need to know that most headphone drivers produce low-frequency magnetic fields as they convert an electric signal into an acoustical signal that you hear as music. In response, Ultrasone developed a special MU Metal shielding (ULE-technology) to reduce the radiation by up to 98% compared to current headphones. The ULE-technology has stood the test of international review and is recommended by technical surveillance organizations. Ultrasone originally developed the ULE-technology for professionals as they spend half of their lives in headphones. But due to grand requests the ULE-technology has now been integrated in other Ultrasone headphone lines.
S-Logic Natural Surround Sound
Through the S-Logic Natural Surround Sound the usual headphone sound will be moved out of the head into the room around you. The sound is no longer locked in, but appears broad and detached. Directions and distances can be heard and perceived--it's just like being in a live concert. For this new technology, additional equipment is not required. Take a pair of Ultrasone headphones plus your sound device and you will be ready for the 3-dimensional sound enjoyment.
Safer hearing
S-Logic does not only create a Natural Surround Sound. S-Logic allows, at the same time, a reduction of sound pressure levels by up to 40% (3-4 dB) for the same loudness sensation. This may reduce the risk of hearing damage while ensuring hours of fatigue-free listening. However, Ultrasone generally advises not to listen to music at high volumes to prevent hearing damage.
Based on 
