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OURART QJ21 Flagship Dynamic Driver MMCX HiFi Earbud


OURART flagship earbud, sound continues OURART earbud popular style, prominent vocal. Inspired by the prototype of supercar wheel shaft, it is ergonomic to wear. The whole hollow out design brings the natural and transparent listening feeling. 8 strands 27AWG single crystal pure silver cable, completely different from copper or silver-plated cable, sound is exquisite and pure.

14.6mm composite PEEK+PET titanium-plated diaphragm speaker,

Improved MMCX expansion interface

8 strands pure silver manual upgrade cable, 27WAV higher than 99.996% single crystal pure silver conductor

Pure copper gold-plated plug, provide 3.5mm single end and 2.5mm balanced.

OURART QJ21’s flat head design, with polished round, without edges and corners. It is more comfortable to wear. A good fitness, have certain sound insulation effect. You can use them without eartips.

Sound source to recommend

QJ21’s impedance is 45 Ohm and sensitivity is 127dB, high impedance and high sensitivity. Mobile phone is easy to push the effect, ordinary mobile phone volume needs to open to about 80%.For some low-thrust mobile phones, it is recommended to use the type C earphone cable with slightly higher power. The best effect is over 25mW. If you use a HIFI player or an earphone amplifier, the sound quality will be improved.


Drive unit: 14.6mm PET composite PEEK titanium-plated diaphragm driver

Impedance: 45ohm

Frequency response: 15-45kHz

Sensitivity: 127dB/1mW

THD: <1%@1kHz

Cable: 8 strands 27AWG>99.996 Single crystal pure silver conductor

Connector: MMCX

Plug: 3.5mm single end/2.5mm balanced end

Cavity material: high hardness aluminum



1 cable

1 pair of eartips

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Due to the impact of the COVID-19 pandemic, global international shipping will delays. The delay at our Hong Kong post office is very serious, so we have changed to other fastest or most efficient international shipping. Now the normal estimated delivery time may be delayed by about 1-2 weeks. In some countries where is higher free-tax rate, we will provide free courier service as much as possible.

Free Shipping

All listed items will be shipped though Registered Airmail with tracking number if there is no extra shipping method option listed or shipping description in the product page.

Economy shipping: Will be shipped without tracking number.

Registered Airmail : Will be shipped via such as Hong Kong post , Deutsche Post , Netherlands Post , Singapore Post, you can leave us a message if you have any requirement about the shipping method .

It will be shipped via Hong Kong Post by default, Europe countries can choose to be shipped via Deutsche Post or Netherlands Post, it is also FREE, pls leave us a message if needed.

Express service: Will be shipped via DHL/EMS/UPS/FedEx

  • Views: 11127
  • Brand: OURART
  • Product Code: QJ21
  • Availability: In Stock
  • $245.00

Available Options

Tags: OURART QJ21, MMCX, 2.5mm, balanced