64 Audio is proud to introduce our newest four-driver custom in-ear monitor, A4s.

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64 Audio is proud to introduce our newest four driver custom in-ear monitor, A4s. This complete redesign of our four driver platform is elevated by the Dynamic low frequency driver, making this 64 Audio’s second hybrid custom IEM. Along with that major update, inside A4s is our Tia technology, LID and our patented Apex and 3Dfit tech. While this is targeted at musicians looking for a rich enveloping monitoring experience, the frequency response, detail, and soundstage capabilities of A4s exceed other audiophile products at almost any price point. 


It wouldn’t be surprising to see the A4s being used in a rigorous environment like a live musical performance, and then see that same product being worn by music enthusiasts, or a full-blown audiophile, to listen to a recording of that same performance. This is a true audiophile-grade IEM in every aspect, putting it in the same class as our higher-priced IEMs like N8 and A18s. The frequency response follows proven targets for fidelity and preference. This is bass that can only be produced by a dynamic driver; it is powerful, enveloping and deep while avoiding being muddy. The mids are revealing and present, contributing greatly to its wide stereo imaging and separation. High-frequency response toes the line between neutral and detailed; balanced enough to mix a record on while offering the extension needed to make a recording really come alive.

This product is a custom moulded earphone.
Please consult your audiologist to arrange an appointment to get ear impressions taken. After you have made the purchase, we require you to send us your impressions. The total time for production is usually 4 to 8 weeks.

Please note, this product is excluded from our change of mind policy
  • A4s 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

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