FOSTEX T50RP MK4

The T50RPmk4 is a new headphone developed by Fostex, equipped with a completely redesigned RP planar magnetic driver. Since its debut in 1974 as part of the T50, Fostex's first headphones ever produced, the renowned RP driver has been featured in numerous headphone models over the years. These headphones have been considered top-quality monitoring headphones by musicians and sound engineers worldwide.
The RP planar magnetic driver, first developed over 50 years ago and continuously refined over time, has now reached its fourth generation. A new printed coil pattern has been employed to expand and equalize the vibration area of the flat diaphragm. Additionally, the number of magnets sandwiching the diaphragm has been substantially increased. The components of the magnetic circuit have also been redesigned to optimize the distribution of magnetic flux, suppressing unwanted resonances and achieving even better transient response. This fourth-generation driver, developed by fully incorporating various technologies perfected over time, simultaneously optimizes sensitivity, frequency response, and exceptional transient characteristics. By accurately and delicately reproducing elements across the frequency spectrum, the soundstage and localization have also been improved. The new driver is also more efficient, requiring less power from the headphone amplifier to achieve peak performance.

Both the left and right housings are equipped with connectors for the supplied cable, allowing the cable to be connected to either the left or right side depending on the usage environment. Furthermore, by making the left and right housings symmetrical, the difference in sound characteristics, usually caused by differing internal structures between sides, has been eliminated. The connector is equipped with a 4-pole 3.5mm connector, which supports balanced connections, increasing ease of use and versatility. The cable uses high-quality OFC conductors.

The new, thicker ear pads are of the around-ear type with low resilience, ensuring a comfortable fit, making them comfortable to use even during prolonged listening sessions.

Technical Specifications:

Type: Semi-open
Driver: RP planar magnetic
Impedance: 28 ohm
Sensitivity: 97 dB/mW
Maximum input power: 3,000 mW
Frequency response: 10 – 40,000 Hz
Weight: Approximately 330 g (excluding cable)

Accessories:
Unbalanced cable: Φ3.5 mm (4-pole) to Φ3.5 mm (3-pole) 2 m x 1
Conversion connector: Φ3.5 to Φ6.3 x 1