The third generation of a line that began in 2001, the T-50RP MK3 is based on Fostex's Regular Phase magnetic planar technology, which they have been developing since 1974. Half a century of expertise is condensed into a 50-ohm semi-open headphone, designed for studio monitoring but adopted far beyond that context. Its planar transducer, robust construction, and sensitivity to modifications have made it one of the most discussed headphones in the audio community.
 
Specifications
Type and transducer
Semi-open helmet with RP (Regular Phase) planar technology
Planar transducer
Polyimide film diaphragm with copper printed circuit
Printed copper coil with a zigzag pattern for faithful reproduction of midrange frequencies and voices
Symmetrical Flux Dual Neodymium Magnet Magnetic Circuit
Optimized magnetic structure for homogeneous flux distribution
Audio specifications
Frequency response: 15 Hz – 35 kHz
Impedance: 50 Ω
Sensitivity: 92 dB/mW
Power consumption: 3000 mW
Wide bandwidth suitable for all types of audio sources
Design and performance
RP (Regular Phase) technology offering linear and precise reproduction
Planar diaphragm for excellent transient response and high level of detail
Accurate and natural reproduction
Excellent power handling
Comfort and ergonomics
Memory foam cushions (low-resilience urethane)
Ergonomic design limiting auditory and physical fatigue
Designed for long sessions: monitoring, mixing, mastering
Weight: approximately 315 g (excluding cable)
Connectivity and accessories
Detachable cable with one-sided connection
Cables supplied
1 x 6.35 mm jack cable (3 m)
1 x 3.5 mm mini-jack cable (1.2 m)