X5i High Fidelity


In-Ear Headphones


Crafted for the music lovers who value quality and taste but don’t follow trends blindly, MAS’ X5i is a stylish high end 5-Driver in-ear headphones imbued with minimalist aesthetics and unrivaled performance for music on the go or home listening. Featuring high audio fidelity, broad dynamic range and wide frequency response, MAS' X5i is certified as Hi-Res Audio Headphones by the Japan Audio Society.  


​Full Range Five Driver Design

The full-range 5 linear hybrid driver composed of quad dedicated Balanced Armature drivers to produce bass, mid, mid-high, high frequency and one specially tuned dynamic driver to produce sub bass. Our signature 5 linear driver design delivers clarity and spaciousness with deeper bass and sharper response.  

Proprietary Acoustic Design

The Core Array Technology ™ aligns all acoustic components coaxially in the structure to increase drivers' efficiency, controls sound waves accurately and reduces distortion. The result is less sound degradation, finer detail and a spacious soundstage. The rigid composite acoustic structure of the X5i Titanium can also greatly reduce unwanted resonance to reproduce the purest sound possible.

Core Array Structure_W.png

MAS Interchangeable

Headphone Ecosystem™

All MAS X-Series headphones and earbuds are compatible with separate MAS XX interchangeable headphone cables which offer a variety of purposed-built features to suit your specific needs. The headphones and headphone cables also can be upgraded or replaced separately to cut unnecessary repetitive purchase.


Included MAS XX 3.5mm Cables include a remote cable which allows you to make calls and select tracks on your mobile devices and a silver-coated OFC cable which provides you with extreme audio fidelity.

Optional MAS XX Cables

  • The MAS XX Bluetooth Cable connects to your iOS or Android mobile devices via Bluetooth.

  • The MAS XX Type-C Headphone Cable with Hi-Res Audio DAC connects to your mobile devices via USB-C port for enjoy high quality digital music and 7.1 channel 3D surround sound.


Mobility That Doesn't Sacrifice Musicality 

Thanks to MAS' 5 linear hybrid driver design and proprietary acoustic technology, the X5i is easy to drive from your mobile devices such as smartphones, tablets and portable players, so you can enjoy audiophile-grade sound through music streaming such as Spotify, Youtube, Apple Music, and Google Music with ease.

Sliver-Coated OFC Cable for Extreme Sound Quality

The audiophile grade silver-coated Oxygen-Free Copper (OFC) cable is designed for the extreme audio fidelity. It can give finer detail, smoother treble and faithfully reproduced musical expression. 

Remote Cable for Meeting and Communication

The remote cable allows you to make calls and select tracks on your iOS or Android mobile devices. Its high quality MEMS microphone delivers incredibly clear voice quality perfect for conference call and communication.

(Note: Please note that some mobile devices may not fully support the remote because of different Apps or operation systems.)

Premium Build Quality

Featuring high quality CNC metal parts with anti-fingerprint matt finishing and leather-like surface treatment, the X5i exudes premium build quality and minimalist aesthetics.

Engineered for Ergonomics

Thanks to the compact earbuds, 7 variations of eartips and 3 variations of earwings, the X5i not only provides perfect fit for all kinds of ears but also comfort even used for extended period. The X5i also has good portability with the earbud magnet-clipping design and custom soft carrying pouch.


Please connect and disconnect the MMCX

cables vertically to the jacks or earbuds.


Driver Unit - 10mm Dynamic + 4 Balanced Armatures

Impedance - 12Ω

Frequency Response - 5-70,000Hz

Sensitivity - 105db/mW(@1kHz)

Accessory Kit

  • A silver-coated OFC cable

  • A remote cable with MEMS microphone

  • Four sets of antibacterial silicon ear tips(S/M/M/L)

  • Three sets of memory foam ear tips(S/M/L)

  • ​Three pairs of MAS XX Earwings(S/M/L)

  • A soft carrying pouch

  • A product warranty card