S-Logic Plus technology works to broaden the perceived soundstage. Most headphones play the music directly into the ear, making it apparent to the listener that the source of sound is directly next to their head. According to Ultrasone, S-Logic works by directing sound to the outer ear where it reflects in at different angles, resulting in a perception that the sound is coming from much farther away. The technology does not change the sound signal or use DSPs, just unique driver positioning and case design.
Another technology used for these headphones, Ultra Low Emission (ULE) MU-Metal shielding, is designed to significantly reduce the exposure to electromagnetic radiation. Mu-metals exhibit very high magnetic permeability, acting as a screen for the magnetic field. S-Logic is also claimed to increase the safety of these headphones by reducing sound pressure levels at the eardrum. The PRO 900 will cost $600, though no availability date was given.
[Images courtesy of: paper2k1 from Head-Fi]
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