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64 Audio U4SImage © 64 Audio

64 Audio U4S

73/ 100
Great
HearWiki score

Priced about right

$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
Value6.6

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 premium hybrid universal IEM that blends a dynamic driver with three balanced armatures to deliver a lively, well-rounded sound. Its tuning strikes a balance between engaging bass and clear treble, offering solid resolution and layering for a versatile listening experience. With an 11-ohm impedance and 107 dB sensitivity, it is easy to drive from most sources.

What works

  • Energetic and punchy bass response
  • Smooth lower mids with fast treble
  • Solid technical performance with good layering
  • Easy to drive due to high sensitivity
  • Comfortable fit with improved ergonomics

What doesn't

  • Lower mids can feel slightly recessed
  • Price may be steep for some buyers
  • No included cable options for balanced use

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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