Dunu Mortise: New Open-Back Headphone with Dynamic Driver

The Dunu Mortise was officially launched today (27). The Mortise is the brand’s second open-back over-ear headphone and employs a dynamic driver. However, unlike the Arashi, this new model is positioned in the mid-range segment, making it more accessible to a broader audience. Below are the full details of this new release.

Mortise: Dunu’s First Open-Back Over-Ear with a Dynamic Driver

The Mortise is Dunu’s first open-back over-ear headphone featuring a dynamic driver and was developed to deliver a balanced sonic presentation. In addition, the manufacturer states that its new headphone provides an excellent level of comfort. The main features are outlined below.

Tuning Focused on a Relaxed yet Balanced Sound

The Mortise’s tuning was designed to provide a relaxed presentation without compromising definition. According to Dunu, the sound delivers “precise positioning and a spacious sense of scale.” The company further notes that the engineers aimed to create “an immersive and well-balanced listening experience that remains fatigue-free during extended sessions.”

Ear Cups Made from North American Black Walnut

The Mortise’s ear cups are crafted from carefully selected North American black walnut. According to Dunu, each unit undergoes precision machining and stabilization processes to ensure durability as well as consistency in acoustic performance.

At the center of the ear cups, a grille is implemented to minimize internal reflections and standing wave interference generated by the dynamic driver. Another advantage of the open-back design is the enhanced sense of soundstage width.

Headband and Ear Pads Designed for Enhanced Comfort

Through a headband featuring a wide suspension strap supported by elastic steel wires, the Mortise adapts to different head shapes.

Thanks to soft, high-resilience memory foam, the ear pads conform easily to the contours of the head. This results in a secure yet comfortable seal while preserving acoustic performance.

Detachable Cables with 3.5 mm Connectors

By using 3.5 mm connectors at the headphone side, the Mortise allows for easy cable replacement, including compatibility with third-party options. Additionally, the included cable features high-quality construction and is capable of delivering a satisfying user experience.

Included Carrying Case

The package includes a rigid carrying case, facilitating storage and protecting the Mortise from dust and potential impacts during transport.

Dunu Mortise: Specifications

• Cable Length: 150 cm ± 10 cm
• Cable: High-purity single-crystal copper, 4 conductors
• Connector (headphone side): 3.5 mm
• Driver: Dynamic driver with an ultra-thin carbon fiber diaphragm and flexible suspension
• Frequency Response: 5 Hz – 40 kHz
• Impedance: 38 Ω
• Sensitivity: 98 dB/mW (@ 1 kHz); 113 dB/Vrms (@ 1 kHz)
• Termination (source side): Q-Lock Mini interchangeable plug system, including 3.5 mm single-ended and 4.4 mm balanced plugs
• THD: < 0.2% (@ 1 kHz)
• Weight: 325 g

Release, Price, and Availability

The Dunu Mortise is now available for US$429 via Dunu’s official store on AliExpress. At the time of writing, a discount of US$25 via coupon and an additional US$12.87 using AliExpress app coins were available.