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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
4.6 ★★★★★
Based on 8 reviews
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Product Reviews
★★★★★ 5
Great quality and Easy to install
Size: 18-22 Accord
As someone with zero experience changing air filters, I was honestly surprised at how easy this was. The fit was perfect for my 2010 Honda Accord Sport, and both the cabin and engine air filters installed with no issues at all. It even came with clear, easy-to-follow instructions that made the whole process stress-free. Saved myself money from going to the dealership, and my car is running great. Definitely recommend for beginners wanting to do a simple DIY maintenance job.
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Reviewed in the United States on May 25, 2026
★★★★★ 5
Great Product Great Price
Size: 16-21 Civic, 17-22 CR-V
product was a good priced. Fit as it should. will buy again when needed.
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Reviewed in the United States on May 28, 2026
★★★★★ 5
Air filters are great
Size: 10-24 4RUNNER, 10-23 GX460
I received when promised and it fit my automobile correctly, I get good gas mileage already so we will see if the gas mileage comes up. The quality was great always looking for high quality when changing the air filters and this item met that standard. Go ahead and buy it will meet you demands.
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Reviewed in the United States on May 24, 2026
★★★★★ 4
Great value
Size: 18-26 Expedition, 15-26 F-150, 18-26 Navigator
The engine air filter fit perfect. The cabin air filter was a bit of a challenge fitting. seemed to be a bit larger but it went in and got the cap back on the box. For the price you cant beat it. Would buy again!
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Reviewed in the United States on May 15, 2026
★★★★★ 5
Great Filter Set for Allergy‑Sensitive Families and MPG‑Minded Drivers
Size: 21-25 TLX, 18-25 Odyssey
I bought this set because I prefer handling routine maintenance myself, especially cabin and engine air filters, rather than paying dealership prices for simple jobs. The package included one cabin air filter and one engine air filter, plus a full backup set for the next service interval.
Both filters installed easily and fit the 2018 Honda Odyssey exactly as expected. No trimming, no forcing, and no alignment issues. The cabin filter seated cleanly in the glove‑box housing, and the engine filter dropped into the airbox without any airflow restriction or sealing gaps.
This setup is ideal for Odyssey owners who want to maintain optimal cabin air quality—especially helpful for families with allergies—and for drivers looking to keep engine airflow unrestricted for the best possible MPG and throttle response. It may not be necessary for anyone who relies exclusively on dealership service or doesn’t perform their own maintenance.
Overall, this is a straightforward, high‑value filter set that installs cleanly and supports both air quality and engine efficiency for DIY‑minded Odyssey owners.
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Reviewed in the United States on May 26, 2026