audio-sound @ hatena

An audio review & news blog. The volume should not exceed 80 dB is recommended. I usually adhere to the safe-listening style by WHO. Please note that my aural impressions and interpretations of measurements are also made from a safe-listening style.

Open Audio Witch Pro: 9.2mm dynamic & BA Dual Drivers In-Ear Earphones

Open Audio Witch Pro

Open Audio Witch Pro


Open Audio has released its latest entry-level IEM, the Open Audio Witch Pro.



  • Customized 9.2mm PU Ultra-soft Dynamic Driver & Customized BA Driver
  • Powerful Bass and Clean Treble
  • Harmonious and Natural Sound
  • Wicked and Ergonomic
  • Sturdy 4-Core OFC Cable



  • Product name: WITCH PRO
  • Color: Purple
  • Driver: Customize 9.2mm dynamic & balanced armature driver
  • Frequency division: 2-Channel & Physical
  • Sensitivity: 110dB SPL(@1mw)
  • Impedance: 20 Ohm(@1kHz)
  • Frequency response: 10-20,000Hz
  • Distortion: ≤0.5%(@1kHz)
  • Socket: 0.78mm-2Pin
  • Cable: 4 Core OFC


Open Audio Witch Pro


For Mobile Users of the Next Generation

Updated from the co-branded IP of VTuber team "なるはる ( NaruHaru )" and OPENAUDIO STUDIO, the Witch Pro is tailored for mobile devices with tuning catering to the younger. To make up for the limited radio spectrum available of mobile devices and the digital feel of highly compressed audio, Witch Pro has undergone special tunning that smooths and harmonizes the audio output, thus being able to output dynamic and rich-in-detail sound.


Open Audio Witch Pro


Powerful Bass and Clean Treble

The Witch Pro is equipped with Open Audio’s flagship product, the customized 9.2mm PU ultra-soft dynamic driver with updated super elastic suspension system, producing warm sound with amazing bass, while the customized BA driver of Witch Pro contributes to the treble quality and ensures a better frequency response across the whole audible range.


Open Audio Witch Pro


Harmonious and Natural Sound

With built-in passive voltage divider and bass filtering abled by the flexible low-frequency catheter of the customized BA driver, Witch Pro coordinate the works of BA driver and dynamic driver well to deliver true harmony. While the innovated OA003 plug further the great sound effect with 1-1.5DB improvement in 1KHZ-3KHZ and 10KHZ-20KHZ.


Wicked and Ergonomic

Adapting from the modern image of witches, the Witch Pro comes in Native Blue and Mysterious Purple to represent the naughty and natural curiosity of a forest-living damsel with magical power. Not just a pretty face, the Witch Pro is also an ergonomic earphone with designs fitting most people’s ear canal and plugs that can relieve the tiring of pro-longed wearing. Made of skin-friendly silicone, the tips enable stable wearing without adding too much pressure to the ear canal, contributing to noise-free and comfortable listening.


Open Audio Witch Pro


Sturdy 4-Core OFC Cable

Witch Pro use 4-core cables with OFC, 3.5mm gold-plated plug and 0.78mm sockets, making it durable and easy to use. A quality 3.5mm-6.35mm adapter is also included in the pack for professional equipment and other non-3.5mm devices.


Open Audio Witch Pro




Price & Availability

Open Audio Witch Pro is available at Linsoul and others for $99.


Open Audio Witch Pro.

Open Audio Witch Pro

Open Audio Witch Pro