64 Audio 64 Audio U4s In-Ear Headphones

Regular price $1,099
Sale price $1,099 Regular price $1,099.00

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"When reviewing an IEM I ask myself: Does it create a new price category? Does it disrupt the competition? I think the U4s does both." - Theo Lee AKA Precogvision

64 Audio is entering the $1099 price bracket with a phenomenal offering in the 64 Audio U4s in-ear headphone, 64 Audio's most affordable universal IEM to date.

The 64 Audio U4s in-ear monitor (IEM) is a 4-driver, hybrid IEM with a powerful Dynamic low-frequency driver that results in powerful punch in the low-end. The U4s is the perfect IEM for anyone looking for a rich, enveloping listening experience. The U4s has bass and treble extension in spades. Notes have a generous sense of weight to their transients due to the strong bass boost and thicker midrange.

The U4s also comes with 3 different tuning modules so you can tune them to your liking. The 64 Audio U4s offer's 64 Audio's MX, the new M12 (Only included in launch U4s, no longer included), M15 and M20 modules that will all make varying differences in how you experience the bass and treble on the U4s with the MX being the least amount of bass to the M20 being the most. Flexibility at your fingertips!

The 64 Audio U4s is our pick for the top IEM at the $1099 price category. There really is no competition. 

64 Audio U4s In-Ear Headphones Features

Wearing style More information
Over-ear headphones sit over your ear and surround your ear with a ring of padding. On-ear headphones are padded but rest on top of your ear. In-ear monitors are worn inside your ear canal.


Driver type More information
Speakers and headphones use a device called a 'driver' to create sound. Different types of drivers have different strengths and weaknesses, but can all produce great sound. Common varieties include dynamic, planar magnetic, and electrostatic.

Dynamic, Balanced Armature

Connectivity More information
Connectivity refers to the method in which the headphones connect to the audio source. Headphones can be either wired or wireless.


Portability More information
DACs and amplifiers can either be carried around or meant for static desktop use


64 Audio U4s Sound Profile

The frequency response of U4s follows proven targets for fidelity and preference. It’s powerful, enveloping, and deep while avoiding being muddy; this kind of bass can only be produced by a dynamic driver.

U4s comes short of being classified as warm, rather it is like a tight and agile stand-mount speaker with a well implemented sub. The key to this is how the low-frequency rise starts low enough to keep out of the mid-bass.

Mids are revealing and present, contributing greatly to its wide stereo imaging and separation. U4s’ perfect balance of presence and body lends itself well to every type of music and volume preference.

High frequency response toes the line between neutral and detailed. Mixes that are typically “bright sounding” translate nicely without being harsh or fatiguing.

Bumping Blue Beats

The U4s ergonomic anodized aluminum shell houses a single dynamic driver, two balanced-armature drivers, and one patented tia driver; all weaved together with 64 Audio's patented Tia, LID, and Apex technology. The four-way crossover is elevated with the use of 64 Audio's proprietary electronic low-pass filter; reducing low-frequency distortion. The assortment of included apex modules and ear tips are an invitation to further shape the sound based on preference and source material while the ultra-low impedance premium silver-plated copper cable ensures unimpeded signal transmission.

The dissemination of tia technology within our product range brings that classic 64 Audio sound signature to a new price-point. U4s sounds light on its feet while effortlessly delivering physically engaging sub- bass without bleeding into the mid-bass. Balanced mid frequencies and a pleasant high-mid band respond well to a wide array of music and recording styles at every volume level; present but not fatiguing. The tia high-driver’s open airy quality couples with the extended sound-stage provided by apex for a lifelike sonic experience.

Incredible sound at an affordable price

Taking everything 64 Audio's team of talented engineers have learned over the years, 64 Audio has built the ultimate IEM if you're chasing a U-Shaped sound signature.

With the rising prices in the headphone market, 64 Audio has come out of the gates swinging with a perfectly priced offering that is bound to get audiophiles and muscians bobbing their heads in unison.

New M12 Module

Developed for those who felt that the bass drop between m15 and mX was too drastic. Perfect for tracks where the bass is just slightly overpowering the rest of the spectrum. Increases mid-range punch. (reduction by 1db-4db at 130hz-20hz). *The M12 is no longer packaged with the U4s.

Air Pressure Exchange (Apex)

Apex is a patented vent that releases air pressure in a sealed ear canal while retaining standard IEM levels of isolation, enabling music enthusiasts to listen more comfortably for longer. Apex alleviates listener fatigue and allows for a much more realistic soundstage. Apex comes in four module variations for the 64 Audio U4s: mX, m12, m15 and m20.

Tubeless In-Ear Audio (tia)

tia is a patented IEM design methodology that aims to reduce unwanted resonance and distortion for a transparent and lifelike sound signature. The tia system is comprised of three major elements: open balanced armature tia drivers, the tia single-bore design, and tia acoustic chambers. U4s features two major elements of the tia system: the tia driver and the tia single-bore design.

Bold Blue

The U4s explores a bold new colour aesthetic for 64 Audio. The Slate Blue shell colour was influenced by some of the world’s most beautiful blue-dial timepieces while the unique faceplate pattern is
inspired by Muonionalusta meteorite fragments.

Both the faceplate and shell’s illuminant properties give it a unique tone in varying lighting conditions.

Consistent Performance

The 64 Audio U4s utilizes 64 Audio's patented LID technology to ensure consistent performance when you use the U4s with any device, whether that's the AudioQuest Dragonfly Cobalt, your Sony Playstation controller or your Chord Hugo 2.

LID is a proprietary circuit that corrects the non-linear impedances of the drivers, restoring proper interaction with the source and preserving the desired sound signature.

Electrical Low-pass Filter

Originally developed for U18s this crossover circuit replaces traditional acoustic dampers which can introduce unwanted distortion through vibration and air turbulence. Rather than using acoustic dampers to filter unwanted frequencies after the driver produces them the electrical low-pass filter lowers distortion by eliminating unwanted frequencies before they reach the driver.

Tuning at your Fingertips

The 64 Audio U4s comes with 4 (that's right four!) APEX tuning modules including the brand new M12 module giving you even more freedom to tune your U4s to listening preferences.

Want less bass? Reach for the MX or M12 modules.

Want even more bass? Look at the M15 or the M20 modules.

The world is your oyster!

64 Audio U4s In-Ear Headphones Customer reviews

What's included?

In the box

  • 64 Audio U4s In-Ear Headphones
  • 64 Audio premium leather carrying case
  • TrueFidelity eartips (S,M,L)
  • Silicone eartips (S,M,L)
  • SpinFit eartips
  • Eartip holder
  • Silver-plated copper cable
  • Apex modules (MX, M12 (no longer packaged with U4s), M15 and M20)
  • Sticker

64 Audio U4s In-Ear Headphones Specifications


  • 2 balanced armature drivers - 1 tia driver - 1 dynamic driver
  • 10hz – 20kHz frequency response
  • 107 dB/mw sensitivity @1kHz @ 1mW
  • Integrated 4-way passive crossover
  • 11Ω Impedance @1kHz
  • Isolation:
    -20dB w/ m20 module
    -15dB w/ m15 module
    -12dB w/ m12 module
    -10dB w/ mX module