Note (Mar 17, 2025): This product is backordered and new orders will ship out by the end of April 2025.

Cutting-edge drivers, perfect for music and gaming

The HarmonicDyne x Z Reviews Eris headphones are a collaboration between HarmonicDyne and Zeos of Z Reviews, designed for audiophiles and casual listeners alike. Featuring a bespoke 50mm Ceramic-Metal High-Flux Magnetic Long-Stroke Dynamic Driver (CMHFMLS-DD) tuned by Zeos, the Eris delivers expansive sound staging, deep bass, and distortion-free performance. Its semi-closed back design with an M-type pressure relief system balances sound isolation and openness, making it ideal for gaming, music production, and immersive listening.

Latest generation dynamic driver

The Eris is designed around HarmonicDyne’s latest generation of Ceramic-Metal High-Flux Magnetic Long-Stroke Dynamic Driver (CMHFMLS-DD). Featuring a 50mm ceramic-metal fusion diaphragm, this new dynamic driver is extremely responsive and delivers some of the best sound HarmonicDyne has to offer. Combining the tensile strength of micron-thin metal sheets with the rigidity of ceramic layering, the CMHFMLS diaphragm achieves greater rigidity than typical membrane-based diaphragms while offering more resolution, extremely wide staging, and powerful low end reproduction without noticeable distortion.

Semi-closed back design

The Eris features HarmonicDyne’s M-type pressure relief system that passively ventilates the acoustic cavity. This system combines some of the benefits of closed back headphones, such as better sound isolation (roughly -5db), with passive airflow to achieve an open-sounding or “big stage” experience. Balancing/tuning the internal pressure within the acoustic cavity allows for a life-like sound staging experience and substantial bass control down to the sub-bass frequencies.

Comfort, build, looks

Zeos put extra care into making sure the Eris was as comfortable as possible for long listening sessions. The pads are crafted out of softer materials and feature a unique Light Blue micro-suede fabric and vegan-leather design in order to achieve the ideal level of airflow, isolation, and comfort in both warm and cool environments. The headband and frame were constructed with resilient materials including injection-molded plastic, glass, aluminum, and were put through rigorous physical testing. The Eris weighs 320g (without cable), making it lightweight enough to use for hours while walking, gaming, yoga and other physical activities.

The balanced cable

The Eris comes standard with a 4.4mm custom balanced cable (3.5mm Dual Entry) made from customized solder-tuned single crystal copper wires. More costly to manufacture than traditional stock cables, this upgraded cable allows for worry-free connection from any source gear to Eris for the best listening experience right out of the box, and can be swapped out for other custom 3.5mm dual termination cables in the future, ensuring customizability and preference are in your hands.

Two listening experiences

Due to the fully-symmetrical design of the Eris, it’s actually possible to reverse the cable left and right and use the headphone backwards to achieve a separate and unique listening experience. Moving the angled driver to the rear of the cup takes the focus off of detail retrieval and applies an even greater sound stage presentation, while keeping imaging and overall tonality very similar.

Product highlights

Designed with Zeos from Z Reviews
Next-gen drivers: 50mm ceramic-metal diaphragm for wide staging, deep bass, and minimal distortion
Semi-closed design: Balances isolation (-5db) with open-stage sound
Soft micro-suede pads and lightweight (320g) build for hours of use
Balanced 4.4mm solder-tuned copper cable
Two listening modes: detail-retrieval or soundstage

Specs

Drivers: Ð¤50mm Dynamic Driver
Acoustic Architecture: Semi-closed (4 Vent)
Input impedance: 32ohm
Frequency Response: 10-70KHz(Free Field)
Sensitivity: 118dB/Vrms
THD: <0.2%
Cables: 4.4mm Balanced Cable
Ear-pads: Micro-Suede Fabric + Vegan Leather
Dimensions: 210*175*105(mm)
Weight: Approx. 320g (without cable)
Cable Length: 1.5M

What’s included

1 x HarmonicDyne x Z Reviews: Eris
User Manual

NOTICE: Eris can take up to 50 hours of Burn-in for the driver and ~10 Hours of Break-in for the Pads to achieve its final sound. When brand new, if the pads have any noise/squeak this is caused by a residue on the plastic below the pads from manufacturing. Remove the pads and wipe the plastic facia with fingers or a clean rag to remove film and then restore the pads.

Brand Spotlight: HarmonicDyne

Price

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HarmonicDyne x Z Reviews Eris 50mm Dynamic Driver Headphones