Field Test · Studio Gear Review
Fostex TH1100RP
Technical analysis of Fostex’s open-back TH1100RP headphones from October 2024
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Spec Sheet
- Wired
- Circumaural
- Open design
- Magnetostatic
- Frequency range: 5 Hz – 40,000 Hz
- Impedance: 32 Ohm
- Sensitivity: 96 dB (@1kHz, 1mW)
- Driver: dynamic
- RP planar magnetic
- Maple wood housing with trade-indigo blue colour treatment
- Ear pads made of silk protein artificial leather
- Detachable, low-oxygen copper cable (7N OFC)
- Two-sided cable routing
- Cable length: 1 m
- Connection: Gold-plated 6.3 mm stereo jack
- Weight (without cable): 420 g
- Colour: Blue
- Includes leather bag
Studio Log
| Available since | October 2024 |
|---|---|
| Item number | 600865 |
| Sales Unit | 1 piece(s) |
| Design | Over-Ear |
| System | Open |
| Impedance | 32 Ohms |
| Frequency range | 10 Hz – 40000 Hz |
| Adapter | No |
| Replacable Cable | Yes |
| Marrone/Argento | Wood / Blue |
| Max. SPL | 96 dB |
| Sensitivity | 96 dB |
| Type Of Connector | Jack(stereo) |
| Weight | 420 g |
| Replaceable Cable | Yes |
| Colour | Wood / Blue |
Demo Footage
Field Photography
QC Pass — Field Test
Customer Review Summary
Introduction
Released in October 2024, the Fostex TH1100RP aims to deliver premium audio performance through a design blending magnetostatic driver technology and high-quality materials. Sold at a price point of approximately £2,499, these over-ear headphones have an open-back configuration and employ dynamic planar magnetic drivers. This review focuses exclusively on the technical specifications to evaluate their potential performance.
Build Quality and Design
The design of the TH1100RP features a circumaural, open-back layout housed in maple wood with a distinctive trade-indigo blue colour finish. The wooden housing not only serves aesthetic purposes but often contributes to natural resonance characteristics in headphone acoustics. At 420 grams (excluding cable), the headphones sit in a comfortable weight range for extended listening sessions. Ear pads are crafted from silk protein artificial leather, a choice targeting a balance between comfort and acoustic transparency.
Cable and Connectivity
The headphones come with a detachable low-oxygen copper cable measuring 1 metre in length. The cable uses 7N oxygen-free copper (OFC), a material known for its purity and signal transmission efficiency. Two-sided cable routing enhances flexibility in use, and the cable terminates in a gold-plated 6.3 mm stereo jack, promoting solid connection integrity and compatibility with high-end audio equipment. The ability to replace the cable adds longevity and potential for custom cable upgrades.
Acoustic Performance Parameters
- Driver Type: RP planar magnetic dynamic drivers
- Frequency Response: 10 Hz, 40,000 Hz (manufacturer’s specs), with some references stating 5 Hz, 40,000 Hz, indicating extension into sub-bass frequencies
- Impedance: 32 Ohms, suitable for a wide range of audio sources, including portable devices and dedicated headphone amplifiers
- Sensitivity: 96 dB at 1 kHz/1 mW, implying moderate efficiency and requiring a reasonable amount of power for optimal volume levels
- Maximum Sound Pressure Level: 96 dB, adequate for safe listening within typical use
The planar magnetic driver technology used in the TH1100RP is notable for offering detailed sound reproduction with low distortion levels. This design generally ensures fast transient response and coherent phase characteristics across the frequency spectrum. The open-back system allows for greater spatial representation and airiness in sound but simultaneously reduces isolation, making these headphones best suited for controlled listening environments.
Potential Sound Characteristics
While no subjective listening data is available, the technical parameters suggest certain sonic tendencies. The wide frequency response reaching beyond the audible range up to 40 kHz potentially enables very detailed reproduction of overtones and harmonics. The impedance rating of 32 Ohms is relatively low, facilitating compatibility with portable devices, though the planar magnetic design may benefit from dedicated amplification for maximal dynamic capability. The open-back construction coupled with maple wood housing may impart a natural resonance and open soundstage, with the ear pads contributing comfort and subtle acoustic damping.
Conclusion
Fostex’s TH1100RP headphones present as a technically impressive offering within the premium magnetostatic headphone segment. Their use of planar magnetic drivers, coupled with a finely crafted wooden design and high-grade components like silk protein artificial leather pads and 7N OFC cables, positions them well for audiophiles seeking detailed and natural sound reproduction. The technical data points to headphones capable of extended frequency response, efficient impedance matching, and robust build quality. However, successful integration into a user’s audio setup will depend on the accompanying amplification and environment due to the open-back nature. Overall, the TH1100RP merits serious consideration based on its solid technical foundation and premium materials.
