
The Fostex T50RP Mk3 is a planar magnetic headphone that offers a significant improvement in sound quality over its predecessor, the Mk2. While the Mk2 model was known for its mid-emphasis and rolled-off treble and bass response, the Mk3 delivers much better tonal balance with slight enhancements in the treble and a reduction in bass below 100Hz. The T50RP Mk3 provides excellent clarity, with more realistic mids and improved treble quality. However, it lacks sub-bass, which may be a drawback for those who prefer a stronger bass response. To address this, some users have created custom balanced cables for the T50RP Mk3, claiming that they improve the sound balance and make the headphones easier to drive. Overall, the T50RP Mk3 offers a more balanced sound signature compared to the Mk2, making it a popular choice for audio enthusiasts interested in headphone modifications.
| Characteristics | Values |
|---|---|
| Sound | Better balanced than its predecessor, with a slight sizzle in the treble and loss of bass below 100Hz |
| Bass | Bass response is improved, but bass quality is not great |
| Treble | Treble quality is improved, but the lack of treble extension results in a lack of 'air' to the sound |
| Mids | Mids are much more realistic and have gained clarity |
| Build Quality | Solid metal sliders, metal headband, and high-quality plastics |
| Earpads | Soft but very flat with a small opening for the ears |
| Cable | Detachable locking cable mechanism |
| Impedance | 50 ohm |
| Sensitivity | 92dB (at 1kHz, 1mW) |
| Frequency Response | 15Hz – 35kHz |
| Maximum Input Power | 3000mW |
| Weight | 315g |
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What You'll Learn

The T50RP Mk3 delivers better tonal balance than its predecessor
The Fostex T50RP Mk3 is an upgrade on its predecessor, delivering better tonal balance. The Mk3 model has a flatter frequency response, with an elevated area between 100Hz and 400Hz, which was significantly colouring the bass and mids on the previous version. This has been addressed, and the result is a more neutral sound, with improved treble quality and much-increased clarity in the mids.
The T50RP Mk3 has a slight sizzle in the treble and a loss of bass below 100Hz, but the overall sound is much better balanced than the Mk2, which sounded quite mid-emphasised. The bass response can be improved with a Kameleon filter, which adds more 'body' and improves the dip around 3kHz. The treble peak has also been lowered, and the treble level is now more even, resulting in a more realistic sound.
The T50RP Mk3 is a good choice for headphone enthusiasts who want to modify their headphones. The build quality is excellent, with solid metal sliders, a metal headband, and high-quality plastics. The locking detachable cable mechanism is also a nice feature, and the cable itself can be modified to improve the sound balance.
While the T50RP Mk3 delivers better tonal balance than its predecessor, it is not without its drawbacks. The sub-bass extension and treble extension are lacking, resulting in a lack of 'air' to the sound, and the bass quality is not as good as the previous version. The headphones are also inefficient and require a dedicated headphone amp or A.C. wall-powered device to reach solid listening levels.
Overall, the T50RP Mk3 delivers improved tonal balance over the Mk2, with a more neutral sound and increased clarity. However, the lack of bass and treble extension may be a drawback for some users.
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The bass response is slightly higher than the Mk2
The Fostex T50RP Mk3 headphones have a more balanced sound than their predecessor, the Mk2. While the Mk2 sounded quite mid-emphasized with a rolled-off treble and bass response, the Mk3 has a slight emphasis on the bass, giving it a meatier sound. This is achieved through a 2-3dB rise in bass below 200Hz, resulting in a more dynamic and impactful bass response. The elevated area between 100Hz and 400Hz, which significantly coloured the bass and mids in the Mk2, has been flattened in the Mk3, improving the clarity and realism of the mids.
The bass response of the Mk3 can be further enhanced by using a Kameleon filter, which boosts the bass response by 10dB at 20Hz and raises the area between 100Hz and 300Hz by about 2dB. This modification adds more "body" to the sound and improves the overall clarity.
Despite the improvements in bass response, the Mk3 still lacks sub-bass, with a noticeable roll-off below 100Hz. This may be a drawback for listeners who prefer strong bass response in their headphones. However, the Mk3's bass response can be improved through headphone modifications, making it a great choice for audio enthusiasts who enjoy customizing their headphones.
The T50RP Mk3 also excels in other areas of sound reproduction. The treble quality has improved, and the headphones offer excellent tonal balance and good clarity. The mids are much more realistic and clear, and the highs have gained a little presence. Overall, the Mk3 provides a more open and balanced sound compared to the Mk2, making it a preferred choice for those seeking an upgrade in audio performance.
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The T50RP Mk3 is not a sealed headphone
The Fostex T50RP Mk3 is not a sealed headphone. It is an open planar magnetic headphone. The T50RP Mk3 delivers excellent tonal balance and good clarity, with a slight sizzle in the treble and a loss of bass below 100Hz. The bass response of the T50RP Mk3 is not as good as that of the Audio Technica ATH-M50x, which is a fully sealed headphone with a better bass response. The T50RP Mk3 also lacks sub-bass, with a roll-off that starts at 50Hz and is quite audible.
The T50RP Mk3 is an upgrade from the Mk2 version, which sounded quite mid-emphasized with a rolled-off treble and bass response. The Mk3 sounds much better balanced, with improved treble quality and more realistic mids. The elevated area between 100Hz and 400Hz, which coloured the bass and mids of the Mk2, is now much flatter in the Mk3. The dip around 4kHz is also smaller, resulting in improved treble quality.
The T50RP Mk3 is a headphone for enthusiasts who are interested in modifying their headphones. It is not expected to gain wide popularity due to its utilitarian style, extreme inefficiency, and lack of sub-bass. The T50RP Mk3 requires a dedicated headphone amp or an A.C. wall-powered device with a strong headphone amp to reach solid listening levels.
The T50RP Mk3 has a locking detachable cable mechanism, and some users have reported that replacing the stock cable with a balanced cable can improve the sound balance and make the headphones easier to drive. However, it is important to note that the T50RP Mk3 is not a balanced headphone, and the cable modification only improves the sound balance to some extent.
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The T50RP Mk3 is inefficient and requires a dedicated headphone amp
The Fostex T50RP Mk3 headphones have been praised for their improved sound quality compared to their predecessor, the Mk2 model. However, it is important to note that the T50RP Mk3 headphones are known for their inefficiency and require a dedicated headphone amplifier to function optimally.
The T50RP Mk3 headphones have a sensitivity rating of 92dB at 1kHz and 1mW, which indicates that they are relatively insensitive and require more power from an amplifier to achieve the same volume level as more sensitive headphones. This is supported by user reviews, which suggest that the headphones cannot reach satisfactory listening levels when used with most portable players and smartphones.
To address this issue, it is recommended to use a dedicated headphone amplifier or an A.C. wall-powered device with a strong built-in headphone amplifier. This will provide the necessary power to drive the headphones and achieve solid listening levels. It is worth noting that the T50RP Mk3 headphones have a maximum input power rating of 3000mW, so it is important not to exceed this limit to avoid potential damage.
While the T50RP Mk3 headphones may not be the most efficient option on the market, they offer a great platform for headphone enthusiasts interested in modifications. With the right combination of amplifiers and audio cables, users can significantly improve the sound quality and overall listening experience.
In conclusion, the T50RP Mk3 headphones' inefficiency requires a dedicated headphone amp to unlock their full potential. This may be a minor inconvenience for some users, but it presents an opportunity for audio enthusiasts to customise and optimise their listening experience.
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The T50RP Mk3 has a detachable locking cable mechanism
The T50RP Mk3 headphones have a locking detachable cable mechanism. This means that the cable can be removed and replaced with a different one if desired. The locking mechanism helps to secure the cable in place and prevent it from becoming loose or disconnected.
Some users have reported that the locking mechanism on the T50RP Mk3 can be frustrating and have chosen to modify their headphones by replacing the stock jack with a non-locking TRRS jack. This modification allows for greater flexibility in terms of cable options and can improve the sound quality by reducing contact issues that may be caused by the stock jack.
One popular modification is to use a balanced microphone cable with two 24-gauge wires soldered to each pole and potted to prevent corrosion and separation. This type of cable can improve the sound balance of the headphones and make them easier to drive. It is worth noting that while some users have reported success with this modification, others may prefer to use the stock cable and jack that came with the headphones.
The T50RP Mk3 headphones are known for delivering excellent tonal balance and good clarity. However, some users have noted that the bass response of the headphones can be lacking, particularly below 100Hz. The treble quality has also been criticised for lacking 'air' and not sounding realistic. Despite this, the T50RP Mk3 headphones are a popular choice for audio enthusiasts, especially those who enjoy modifying their headphones to improve their performance.
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Frequently asked questions
The T50RP Mk3 headphones are not inherently balanced, but some users have noted that using a balanced cable can make the sound more balanced.
You can purchase a replacement headphone jack for your headphones, which will allow you to use a balanced cable. This can be done through companies such as Mod House Audio, which offers a non-locking TRRS jack replacement and sells compatible Periapt cables separately.
Yes, there are alternative headphones that support balanced sound. The Audio Technica ATH-M50x is a commonly suggested alternative, which has a better bass response and is fully sealed. The HiFiMAN HE400S is another option, offering a more refined and open sound.










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