Fostex TH-1000RP Mk2

Fifty years of planar transducer development take shape in this open-back headphone assembled in Japan, where the proprietary RP technology reaches its most advanced expression in this second generation. The maple, dyed with natural indigo using Tokushima’s ancestral Awa-Aizome method, gives each unit a unique visual identity while contributing to the overall acoustic qualities. The combination of this traditional craftsmanship and the technical refinements of the mk2 version aims to deliver precise reproduction across the entire audible spectrum.

The most advanced planar diaphragm in the range

The RP mk2 transducer is built around the largest planar diaphragm ever used in the series. This fully driven membrane stands out thanks to an air-damping control system that precisely manages diaphragm movement. Damping materials regulate the internal airflow within the driver, while the optimized magnetic circuit eliminates unwanted resonances. This technical architecture enables a fast transient response and maintains constant amplitude, particularly in the low frequencies. The sensitivity of 96 dB/mW with an impedance of 32 Ω makes pairing with various amplification sources easier. The frequency response ranges from 10 to 40,000 Hz.

An open design tuned for soundstage

The open-back configuration of the TH1100RPmk2 relies on double-layer etched aluminum grilles positioned at the rear of the earcups. Every internal component and the opening ratio have been finely tuned to achieve an expansive soundstage and precise imaging. This architecture is designed to reproduce a natural acoustic field while limiting listening fatigue during long sessions. The hard maple housing brings density and acoustic neutrality: the lows gain depth, the mids retain their clarity, and the highs unfold without excessive coloration.

The craftsmanship of Awa-Aizome dyeing

Each maple shell undergoes a hand-dyeing process that takes several days. Awa artisans apply natural indigo (Hon-ai) in successive layers, alternating applications and drying phases. Variations in temperature and humidity influence how deeply the pigments penetrate the wood fibers, creating unique grain patterns from one unit to another. This “Hon-ai” method uses exclusively plant-based indigo from Persicaria tinctoria, a plant grown in Tokushima. The result combines the characteristic deep blue with the natural texture of maple, giving the headphone an appearance that shifts with viewing angle and lighting.

Dual-structure mk2 earpads

The new earpads feature an angled shape at the contact area with the face, optimizing pressure distribution. Their internal structure combines two foam densities: a soft outer layer and a highly elastic inner layer that gradually conforms to the contours of the head. The protein leather covering, made from silk-based proteins, is rated by the manufacturer as three times more durable than on the previous model. This combination is designed to maintain comfort even after several hours of continuous listening.

7N OFC copper wiring and detachable connectors

The 3.5 mm 2-pole connector makes cable replacement easy and broadens customization options. The standard asymmetric cable is 2 meters long and uses 7N-grade OFC (Oxygen-Free Copper), offering 99.99999% purity. This high level of refinement limits impurities and supports accurate signal transmission. The gold-plated 6.3 mm stereo jack termination ensures a stable connection. A 4.4 mm balanced cable is available separately (reference ET-TH4.4BL2Y) for those who want to use balanced amplification.

Magnesium alloy and genuine leather headband

The main mechanical parts use a magnesium alloy that reduces weight by 20% compared with aluminum. This lightness results in a total mass of around 420 grams without the cable. Rubber joints integrated into the swivel mechanism absorb unwanted vibrations and improve the mechanical silence of the assembly. The headband and strap use genuine lambskin, which develops a patina over time while remaining supple. This material combination balances structural strength and long-term comfort.

Technical specifications

Acoustic features

• Type: open-back headphones with planar magnetic transducer
• Transducer technology: RP mk2 with full-size planar diaphragm
  • Maximum-size planar diaphragm for this series
  • Pneumatic damping system for motion control
  • Magnetic flux optimization via damping materials
  • Reduction of unwanted resonances
• Impedance: 32 Ω
• Sensitivity: 96 dB/mW
• Maximum input power: 3000 mW
• Frequency response: 10 – 40000 Hz
• Sound performance
  • Fast, precise transient response
  • High sensitivity for dynamic reproduction
  • Deep bass with optimal amplitude
  • Clear, transparent midrange
  • Precise, ringing treble
  • Excellent spatial localization and soundstage

Construction and materials

• Ear cups in solid maple wood dyed Awa indigo
  • Traditional handcrafted Awa dye (Tokushima region, Japan)
  • Hon-ai method using natural indigo for a uniquely deep blue
  • High-density maple wood, acoustically neutral
  • Unique grain and hue for each unit
  • Hand-assembled in Japan
• Mechanical parts in magnesium alloy
  • Headband base and structure in magnesium
  • 20% weight reduction compared to aluminum
  • Rubber joint on rotation mechanism for vibration damping
  • Optimized strength and lightness

Comfort and ergonomics

• Optimized mk2 ear pads
  • Angled shape for ergonomic fit
  • Two-layer internal structure: soft outer foam, high-elasticity inner foam
  • Silk-protein synthetic leather covering, three times more durable
  • Optimal comfort for long listening sessions
• Headband and strap
  • Material: genuine lambskin leather
  • Exceptional softness and comfort
  • Perfect fit for extended use
• Weight: approximately 420 g without cable

Connectivity and cabling

• Detachable connection system
  • Connectors: 2-pole 3.5 mm per ear cup
  • Re-cabling compatible for customization
• Supplied cable
  • Length: 2 m
  • Configuration: asymmetric Y-type
  • Conductor: 7N oxygen-free copper (99.99999% purity)
  • Plug: 6.3 mm gold-plated stereo jack
• Available option
  • 4.4 mm balanced cable (reference ET-TH4.4BL2Y)

General specifications

• Model: Fostex TH1100RPmk2
• Series: RP mk2 Flagship
• Edition: Awa Indigo handcrafted
• Included accessories: leather pouch, safety guide
• Manufacturing: hand-assembled in Japan