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Description
Fostex T50RPMK4 Planar Magnetic Semi-Open HeadphonesStyled in black, the T50RPmk4 from Fostex is the latest iteration of the company's highly regarded Regular Phase (RP) series of headphones, now equipped with a completely redesigned RP planar magnetic driver. The headphones utilize proprietary technology in order to ensure an accurate reproduction of sonic material, thereby rendering these semi open headphones suitable for monitoring in studio situations. To ensure a full representation of the sonic
Styled in black, the T50RPmk4 from Fostex is the latest iteration of the company's highly regarded Regular Phase (RP) series of headphones, now equipped with a completely redesigned RP planar magnetic driver. The headphones utilize proprietary technology in order to ensure an accurate reproduction of sonic material, thereby rendering these semi-open headphones suitable for monitoring in studio situations. To ensure a full representation of the sonic spectrum, these headphones have a frequency response of 10 Hz to 40 kHz.
4th Generation RP Series Driver
- The RP technology planar magnetic driver, first developed over 50 years ago and refined continuously throughout the years, has now hit its 4th generation.
- A new printed coil pattern shape has been employed to expand and equalize the vibration area of the flat diaphragm. Additionally, the number of magnets that sandwich the diaphragm has been increased substantially.
- Furthermore, the components of the magnetic circuit have been redesigned to optimize their magnetic flux distribution, suppressing unnecessary resonance and achieving an even better transient response.
- This 4th generation driver was developed by fully incorporating various technologies cultivated over the years, simultaneously achieves improved sensitivity, smooth frequency response, and superb transient characteristics.
- By accurately and delicately reproducing elements all 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.
Symmetrical Housing and Detachable Cable
- Both the left and right housings are equipped with connectors for the supplied cable, so that the cable can be connected to either the left or right depending on the usage environment.
- In addition, 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 TRRS 3.5mm connector, which supports balanced connections, increasing ease of use and versatility. The cable uses high-quality OFC conductors.
Comfortable Earpads
The new thicker ear pads feature a low-resilience around-the-ear design that provides a comfortable fit, making them comfortable to use even when listening for long periods of time.
Specifications
Headphone
| Wearing Style | |
| Earpiece Design | |
| Open/Closed-Back | |
| Sound Field | |
| Driver Type | |
| Impedance | |
| Active Noise Cancellation | |
| Frequency Response | |
| Sensitivity | |
| Maximum Power Handling | |
| Volume Limiting / Child-Safe | |
| Built-In Controls |
Microphone
| Built-In Mic |
Connectivity
| Audio Connector | |
| Included Adapter | |
| Cable Design |
Physical
| Color | |
| Environmental Resistance |
Packaging Info
| Package Weight | |
| Box Dimensions (LxWxH) |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.7 ★★★★★
Based on 29 reviews
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Product Reviews
★★★★★ 5
Perfect everyday digital watch
It does not have fancy features, but has everything we need everyday with great quality at reasonable price.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 14, 2026
★★★★★ 5
Top quality low budget watch!
The one thing budget watch collectors should know is that this Casio model is the only watch under $25.00 that comes with a mineral glass screen and not that cheap Acrylic plastic screen that scratches easily. It's also a 200 meter WR watch which is about 2 football fields in depth if you love snorkel diving off the coast. The screen visibility of reading the time and other features is outstanding. It also has 4 time zones you can program in , 5 Alarms, count down timer and stop watch. You can set it for 12/24 hours time format. I always order the steel bracelet that comes off another model of this because it not only looks and feels like a top quality watch but also matches the steel bezel. Do not buy the negative display version because it's unreadable.
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Reviewed in the United States on October 6, 2025
★★★★★ 5
Casio's best yet!
Casio is by far the best digital watch company in the world but it just seems like this watch wins it all. The upcoming list is of reasons why I think this Casio watch is the best one you can buy.
Reason One:
The price is unbeatable! I have never seen such a great watch for the price of $13! And coming from Casio you know it won't be a rip off! There are plenty of other Casio watches that can do the same thing that this watch can do for a price twice as much! With a price like $13 nothing can go wrong and it won't be such a bummer is you don't like it overall. 5/5
Reason Two:
The amount of things it can do. This watch is capable of doing world time in twenty different spots worldwide, you are able to bookmark your four most favorite spots (one of them being were you live), it has five different alarms with exceptional sound when it goes off, and it has a timer and stopwatch that can go to up to 24 hours. This watch was obviously built for a busy life style. 5/5
Reason Three:
Its water proof and has ten year battery. This watch is water proof up to 200 meters under water so you definitely won't need to worry about your watch getting destroyed by water. Its ten year battery makes it so that you won't need to replace the battery for quite a long time. 5/5
To sum it up this watch is cheap but not cheaply made, has world time, five alarms, a stopwatch and timer, can go under water for 200 meters and has a ten year battery! This is worth the buy!
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Reviewed in the United States on December 1, 2015
★★★★★ 4
100% functional watch
Light is subpar , but a 100% functional. Digits size is fine (I am 60). Labels could be brighter, but Casio rarely does modifications to these models. My dad has the same model, now over 15 years.
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Reviewed in the United States on March 21, 2026
★★★★★ 5
Great watch.
Great watch, I mean it’s a Casio so that’s not exactly a hard sell but it looks great if this is your style of watch. I have “a few” watches and about 30 Casios this one is a fun design with a lot of functionality.
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Reviewed in the United States on December 2, 2025
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