• DUNU Mortise open-back headphones with black walnut cups
  • DUNU Mortise on a headphone stand
  • DUNU Mortise walnut ear cup, side view
  • DUNU Mortise cup with the dual 3.5mm cable connectors
  • DUNU Mortise Q-Lock Mini 4.4mm and 3.5mm plugs
  • DUNU Mortise single-crystal copper cable Y-split
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DUNU

DUNU Mortise Open-Back Headphones — 50mm Carbon Fiber Driver, Walnut Cups

DUNU Mortise Open-Back Headphones — 50mm Carbon Fiber Driver, Walnut Cups
  • Genuine & Brand-New
  • Free Shipping · Ships from China
  • 1-Year Warranty
  • 45-Day Returns
$400.99 USD
$400.99 USD
Shipping calculated at checkout.

The DUNU Mortise is an open-back, over-ear headphone with a 50mm dynamic driver that pairs an ultra-thin carbon fiber diaphragm with an N52 magnet, housed in North American black walnut cups and rated at 38Ω and 98dB/mW. It suits home listeners who want wood-cup open-back sound with swappable 3.5mm single-ended and 4.4mm balanced plugs.

Who the DUNU Mortise is for

  • Home listening: DUNU describes the tuning as warm and full-bodied, with an open-back design meant for a naturally expansive soundstage.
  • Balanced and single-ended sources: The Q-Lock Mini plug system includes 3.5mm single-ended and 4.4mm balanced plugs, and a 3.5mm to 6.35mm adapter is included for desktop amps.
  • Wood-cup fans: The cups are North American black walnut, which DUNU says adds internal damping to help control resonance.
  • Long sessions: DUNU lists an ergonomic adaptive fit, and the headphones weigh about 325g.
  • Skip it if: you need isolation; open-back cups leak sound in both directions, so it is not for commutes or shared offices.

DUNU Mortise key specs

  • Design: Open-back, over-ear; North American black walnut cups
  • Driver: 50mm dynamic, ultra-thin carbon fiber diaphragm, flexible surround, N52 magnet
  • Impedance: 38Ω
  • Sensitivity: 98dB/mW (113dB/Vrms) at 1kHz
  • Frequency response: 5Hz–40kHz
  • THD: <0.2% at 1kHz
  • Cable: 4-core high-purity single-crystal copper, 150cm ±10cm, dual 3.5mm at the cups
  • Plugs: Q-Lock Mini system; 3.5mm single-ended and 4.4mm balanced included
  • Weight: Approx. 325g
  • Included: Carrying case, 3.5mm to 6.35mm adapter

Genuine DUNU stock. Free shipping on every order, 45-day returns.

DUNU Mortise vs similar options

  • vs FiiO FT3 32Ω: Uses a larger 60mm dynamic driver at 32Ω and costs about $100 less; pick the Mortise for its carbon fiber diaphragm, N52 magnet and black walnut cups.
  • vs Sennheiser HD 650: A 300Ω open-back that needs a proper headphone amplifier; pick the Mortise for its 38Ω load and swappable Q-Lock Mini 3.5mm and 4.4mm plugs.
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Specifications

Driver 50mm dynamic, ultra-thin carbon fiber diaphragm
Impedance 38Ω
Sensitivity 98dB/mW (113dB/Vrms) at 1kHz
Frequency response 5Hz–40kHz
Connector Dual 3.5mm at the cups; Q-Lock Mini 3.5mm and 4.4mm plugs
Weight Approx. 325g

What's in the box

  • DUNU Mortise headphones
  • 4-core single-crystal copper cable (150cm, dual 3.5mm)
  • Q-Lock Mini 3.5mm single-ended plug
  • Q-Lock Mini 4.4mm balanced plug
  • 3.5mm to 6.35mm adapter
  • Carrying case
Good to know

Buying from TonePier

Is this unit genuine?

Yes. Every unit we sell is genuine and brand-new, shipped in its original packaging, and backed by our 1-year TonePier warranty and 45-day returns.

Where does my order ship from, and how long does it take?

Every order ships from our warehouse in China, with full tracking, and most orders ship within 3 business days. Shipping is free on every order; most US orders arrive within 7–15 business days and most orders to other countries within 7–20 business days — see our shipping policy for details.

What if it isn't for me?

You get 45 days to decide. Keep the packaging, keep it in like-new condition, and send it back for a refund. Ear tips unsealed for hygiene reasons are fine — we expect you to actually listen.