Field Test · Studio Gear Review
Fostex T50RPmk4
In-depth technical analysis of Fostex’s semi-open planar magnetic headphones
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Spec Sheet
- Cabled
- Circumaural
- Semi-open
- Magnetostatic
- Frequency range: 10 Hz – 40,000 Hz
- Impdeance: 28 ohms
- 4th generation RP Planar Magnetic driver
- Sensitivity: 97 dB/mW
- Maximum power rating: 3.000 mW
- One-sided detachable cable (can be plugged in on the left or right)
- Cable length: Approx. 2 m
- 3.5 mm Stereo mini jack
- Self-adjustable headband
- Includes T50RPmk4, cable, adapter 3.5 mm to 6.3 mm
- Weight (without cable): 330 g
Studio Log
| Available since | July 2024 |
|---|---|
| Item number | 595511 |
| Sales Unit | 1 piece(s) |
| Design | Over-Ear |
| System | Semi Open |
| Impedance | 28 Ohms |
| Frequency range | 10 Hz – 40000 Hz |
| Adaptor | Yes |
| Replaceable Cable | Yes |
| Colour | Black |
| Max. SPL | 97 dB |
| Type Of Connector | Jack, mini-jack |
| Weight | 330 g |
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Customer Review Summary
[META]Explore the Fostex T50RPmk4, a semi-open planar magnetic headphone offering detailed sound and robust design for £206.Introduction to the Fostex T50RPmk4
The Fostex T50RPmk4 is the latest iteration in the T50RP series, brought to market in July 2024. Priced at £206, this semi-open, circumaural headphone is equipped with a 4th generation RP planar magnetic driver, promising a detailed and accurate audio experience suited for studio use. Weighing 330 grams without cable, it manages a balance of lightness and durability, presented in a straightforward black finish.
Design and Build Quality
The T50RPmk4 has a no-frills aesthetic but feels sturdy in hand and on ear. Its self-adjustable headband accommodates various head sizes comfortably, and the circumaural cushions sit securely around the ears, delivering a pleasant fit for extended listening sessions. The semi-open design allows a degree of ambient sound in while maintaining adequate sound isolation for monitoring tasks. A notable feature is the one-sided detachable cable, which can be connected to either the left or right side, this adds convenience and versatility compared to fixed cables.
Cabling and Accessories
- One-sided detachable cable approximately 2 metres long
- 3.5 mm stereo mini-jack connector with included 6.3 mm adapter
- Replaceable cable design enhances longevity and usability
Technical Specifications
The heart of the T50RPmk4 is its fourth-generation planar magnetic driver, which contributes to its broad frequency response and low distortion characteristics. The specified frequency range spans from 10 Hz to 40,000 Hz, covering the full audible spectrum and extending beyond to ensure accurate harmonic reproduction without unwanted coloration.
- Impedance: 28 Ohms, ideal for use with a variety of sources but performs best with a dedicated headphone amplifier
- Sensitivity: 97 dB/mW, facilitating robust volume levels
- Maximum power rating of 3,000 mW allowing it to handle powerful amplification without strain
- Maximum sound pressure level (SPL): 97 dB
Sound Quality and Performance
In practice, the T50RPmk4 delivers a sound profile that is analytical yet musical, fulfilling the primary expectations for a studio headphone. The bass response is controlled and precise, lacking excessive boom but providing clear definition. Midrange clarity shines, making vocals and instruments easy to distinguish, which is essential for mixing and mastering tasks.
The treble maintains openness without harshness, attributed to the planar magnetic technology reducing distortion. This technology also allows the headphones to manage sudden dynamic peaks without exaggerated compression or loss of detail.
Users should note that to obtain the best from these headphones, pairing with a capable headphone amplifier is advisable. The low impedance and planar magnetic drivers benefit from amplification to unlock full dynamic range and resolution.
Practical Considerations
Weighing in comfortably and featuring a reasonably long cable, the T50RPmk4 is conducive to both studio and desktop use. Its semi-open design prevents the claustrophobic feeling sometimes induced by closed-back models, at the cost of some external sound leakage. For critical listening environments, careful placement and room acoustics should be considered.
Conclusion
The Fostex T50RPmk4 represents a compelling choice in its price segment for those seeking a robust, analytical headphone that does not forsake musicality. Its planar magnetic drivers deliver exceptional detail across the frequency spectrum, while the build quality and design support long working sessions. When driven by a competent amplifier, its performance justifies the investment. This model stands out for its original technology and solid value for money, making it a recommended option for professionals and enthusiasts alike.
