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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 12 reviews
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Product Reviews
★★★★★ 5
Incredibly Comfortable and Supportive — My New Favorite Pillow！
I wasn’t expecting to love this pillow as much as I do, but the DIORIS large sleeping pillow really exceeded my expectations. From the first night, I noticed a difference in the way my neck and shoulders felt in the morning—less tension, better alignment, and overall more restful sleep.
The fill is just the right balance between plush and supportive. It doesn’t flatten out during the night, which is a problem I’ve had with other pillows, especially those that come overstuffed or too soft. This one holds its shape well but still has that cozy, cloud-like feel when you lay your head on it.
I’m a side and back sleeper, and this pillow works beautifully in both positions. It’s also large enough that I don’t feel like I’m falling off it during the night, but not so big that it takes over the whole bed.
One suggestion: if you’re picky about loft, you might want to give it a gentle fluff or adjust the fill before your first night. But honestly, I didn’t need to do much—it was pretty much perfect out of the bag.
Highly recommended if you're looking for a high-quality, comfortable, and generously sized pillow that supports a great night’s sleep!
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Reviewed in the United States on May 9, 2025
★★★★★ 5
Hotel like pillow
These pillows were a pleasant surprise. I bought the set for our guest room but ended up keeping them for our own bed after trying them out. They feel incredibly soft yet still provide enough support to keep my neck from feeling stiff in the morning. I sleep on my side and back, and these work great for both positions. My spouse, who usually runs hot at night, said they stayed cool and breathable.
The material feels high quality, and I love that they’re machine washable without losing their shape. They fluffed right back up after drying. If you're looking for that plush hotel-pillow feel with everyday practicality, this set really delivers.
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Reviewed in the United States on May 15, 2025
★★★★★ 4
Very soft, not firm at all
This pillow is very floppy and not firm at all. It is quite large and I was surprised at the size. My dog has taken a liking to it and decided it's now her new dig bed, which is fine by me, because it's really too soft for my liking. If you like soft pillows then this is for you. If you require something with a bit more support then you won't enjoy this pillow.
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Reviewed in the United States on May 11, 2025
★★★★★ 5
Soft and supportive
I recently purchased the this pillow and I am happy with the quality and comfort it provides. Pillow is soft, plush, and supportive without being too firm. The down alternative fill offers the balance of fluffiness and structure, making them ideal for all sleep positions. Whether I’m sleeping on my back, side, or stomach, these pillows adapt beautifully and keep me comfortable throughout the night. They’re also breathable and skin-friendly, which is a huge plus for anyone with sensitive skin. After using them, I wake up feeling well-rested and free of neck stiffness. I like it.
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Reviewed in the United States on May 22, 2025
★★★★★ 5
Pillow
These DIORIS pillows are a game-changer! I’ve tried many pillows over the years, but these are by far the best. The down alternative fill is incredibly soft yet supportive, providing just the right amount of fluffiness without feeling too firm or too soft. I sleep on my side, and these pillows cradle my head and neck perfectly, giving me the support I need for a restful night. They’re breathable and skin-friendly, which is great since I tend to get hot while I sleep. The queen size is just right for my bed, and the pillows maintain their shape night after night. They feel like luxury hotel pillows! Highly recommend for anyone looking for a comfortable, supportive, and durable pillow.
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Reviewed in the United States on May 20, 2025
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