64 Audio A4t Custom In-ear Monitors

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The perfect in-ear monitor for anyone looking for a balanced, full-spectrum sound. The A4t delivers an immersive listening experience with a dynamic mid-range and powerful bass. It's a great option for single-instrumentalists and moderate mixes.

The A4t is the entry point for our exclusive tia™ technology, which provides an amazingly lifelike clarity and musicality to the sound signature.


Exclusive technologies that challenge traditional in-ear monitor designs to give you the absolute best listening experience

A4t features the following unique technology:

A tubeless design that reduces resonance for a transparent and lifelike sound signature.

Only from 64 Audio, apex alleviates listener fatigue by releasing air pressure sealed in the ear canal. This venting enables musicians and music enthusiasts to listen more comfortably for longer.

Preserves the detail of your ear impressions using a new process of digital rendering and 3D printing for the most comfortable custom in-ear monitors available.

Enables a consistent, reliable sound regardless of audio source.



Driver Type/Count

Four precision balanced armature drivers

Driver Configuration

1 tia high, 1 hi-mid, 1 low-mid, 1 low

Frequency Response

16Hz – 20kHz


111 dB/mW


11Ω @ 1kHz


Integrated 4-way passive crossover


-20dB with m20 apex module



  • A4t Custom In-Ear Monitors
  • 64 Audio Personalized Protective Case
  • Dehumidifier
  • Cleaning Tool
  • Shirt Clip
  • 48" or 64" Detachable Professional Cable
  • m20 apex Modules
  • Round Sticker
  • Product Manual