ZMF Caldera Closed — Shou Sugi Ban Ash

Pure Isolation. Explosive Planar Power.

The Caldera Closed is ZMF’s first from-the-ground-up closed-back planar headphone, designed as the natural evolution of the award-winning Caldera Open (Headfonics Best Ortho 2023). It features ZMF’s patented Atrium Damping System, plus the patent-pending Caldera Pad and Caldera Magnet Systems.

Many planar fans love technicalities but crave more authentic timbre and physicality. After years of research, ZMF created unique technologies like CAMS (Caldera Asymmetrical Magnet Structure) and ADS (Atrium Damping System), which combine to deliver a planar headphone with the soul and weight of a dynamic design.

In the Caldera Closed, you’ll find a natural, believable sound that remains detailed, spacious, and coherent — now with enhanced sub-bass impact, closer-to-Harman tuning, and the superior isolation of a closed back. Speed, immediacy, and ZMF’s signature musicality remain intact.

The Caldera Closed debuts a sculpted cup shape inspired by volcanic geometry, with asymmetrical contours for improved airflow and optimized acoustic performance. It feels lighter on the head than expected and looks stunning in hand.

This edition features Shou Sugi Ban Ash as the stock wood, a premium European ash treated with a traditional Japanese charring technique that highlights its grain with dramatic contrast. Each cup is unique, offering an artisan finish paired with cutting-edge engineering.

With an 80mm planar driver, 65Ω impedance, and 95 dB/mW sensitivity, the Caldera Closed is versatile but scales to perfection with powerful, high-resolution amplification.

The Caldera Closed represents the peak of closed planar design: impactful, richly tuned, and technically refined. A true endgame headphone for those who demand both isolation and musical authenticity.

Stock wood: Shou Sugi Ban Ash