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64 Audio U4SImage © 64 Audio

64 Audio U4S

76/ 100
Great
HearWiki score

Buyability: how good it is, what it costs, and whether it is still sold new.

From reviews 82/ 100Good value
$1,100
typical price, USD
Discontinued
Manufacturer pageBuy now onAmazon

At a glance

Brand
64 Audio
Type
Wired IEMs
Fit
-
Connection
Wired
Noise cancelling
No
Released
2023

Score breakdowngreat overall

Sound8.5
Value7.5

A four-driver hybrid universal IEM with one dynamic low driver and three balanced-armature-based high and mid drivers, including a tia high driver. It brings technologies developed for 64 Audio's flagship models to a wider audiophile audience.

The HearWiki takeAI-condensed

The 64 Audio U4S is a hybrid universal IEM that blends a dynamic driver with three balanced armatures to deliver a well-rounded, musical sound signature. It offers punchy, well-defined bass, smooth mids, and crisp treble, making it a versatile and easy-to-drive choice for a wide range of genres. While its tuning leans toward enjoyment rather than pure neutrality, it maintains solid technical performance with good detail retrieval and soundstage for its price point.

What works

  • Energetic and well-extended bass response
  • Smooth, natural midrange with good vocal presence
  • Easy to drive thanks to high sensitivity and low impedance
  • Excellent build quality and comfortable fit
  • Versatile tuning that works well across many music genres

What doesn't

  • Lower mids can sound slightly recessed to some ears
  • Lacks active noise cancellation for noisy environments
  • Price point may be high for those seeking a strictly neutral sound

Paraphrased from published reviews & specs - not an original hands-on test. Our AI disclosure.

Specifications

Audio - 64 Audio U4S
Driver1DD + 3BA hybrid
Driver typehybrid
Driver configuration1DD + 3BA
Drivers per side4
Impedance11 Ω
Sensitivity107 dB/mW

What the reviews said

4 source(s) feeding this product's score.

headfonics.com

87

This review describes the U4s as a significant improvement over the older U4 SE, especially in bass quality, comfort, and overall presentation. It is portrayed as a capable, easy-to-drive hybrid with strong low-end performance, though the lower mids are noted as slightly less full.

Read the full review

audio46.com

This review focuses on the U4s as a hybrid IEM with a clearly defined driver and crossover design, and it presents the model as a premium universal monitor with distinctive tuning. The technical impressions emphasize its dynamic-plus-BA architecture and its measured tuning profile.

Read the full review

headfonia.com

The reviewer characterizes the U4s as a lively, versatile IEM with energetic bass, smooth lower mids, and fast treble. The overall judgment is that its technical performance is solid, with good resolution, layering, and staging.

Read the full review

headphones.com

The U4s is presented as a very strong all-around IEM that lands in an appealing middle ground between technical performance and enjoyable tuning. The reviewer’s overall takeaway is that it offers a refined, balanced sound that makes it easy to recommend at its price.

Read the full review

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Where it sits in our rankings

The data-driven guides this model qualifies for.