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64 Audio U4s Universal In-Ear Monitor
WIRED in-ear HEADPHONE
2-pin connection
studio/professional
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✓ Ships TODAY if you order in the next 03 hr 12 min, with estimated delivery as fast as Mon, Apr 7 to Columbus, OH
✓ 1 year limited 64 Audio warranty
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Product Details
Audio46's Opinion
Although the exceptional level of precision and lack of significant coloration would suggest an almost clinical profile, the U4s is far from boring. The powerful lower-bass frequencies along with the spirited upper mids and high-treble give tracks a lively, yet controlled energy. Add to that a level of resolution that surpasses any other earbuds at this price point, and you’ve got one of the best performing IEMs on the market for under $1500.
Our Full Review
↓ Details provided by 64 Audio ↓
(Specifications and appearance of this product are subject to change without notice)
U4s
A quad driver hybrid UIEM featuring ground-breaking patented technologies originally developed for our flagship products in order to bring a wider audience closer to their music. U4s explores a bold new color aesthetic for 64 Audio. The Slate Blue shell color was influenced by some of the world’s most beautiful bluedial 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.
Its ergonomic anodized aluminum shell houses a single dynamic driver, two balanced-armature drivers, and one patented tia driver; all weaved together with our patented Tia, LID, and Apex technology. The four-way crossover is elevated with the use of our proprietary electronic low-pass filter; reducing lowfrequency 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 subbass 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.
Sound
Wide Nozzle Silicone Tips/m15 Modules (Standard Configuration)
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.
Features
Tia
Tubeless In-Ear Audio is a patented IEM design methodology that aims to reduce unwanted resonance and distortion for a transparent and lifelike sound signature. The tia system consists 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.
LID
Linear Impedance Design (LID) is a patented circuit that corrects the non-linear electrical resistance of the multiple driver-sets comprising this 4 driver IEM. Varying source amplifier output impedance in devices like smartphones, body packs, DAC/amps, and DAPs typically results in varying frequency response, depending on the increase in resistance. Restoring proper interaction with the source and preserving the desired sound signature enables a consistent reliable sound.
Apex
Air Pressure Exchange is a patented vent that releases air pressure in a sealed ear canal all while retaining standard IEM levels of isolation, enabling musicians and music enthusiasts to listen more comfortably for longer. This venting alleviates listener fatigue and allows for a much more realistic soundstage. Apex comes in four module variations for U4s: mX, m15 and m20.
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
MX Modules
Widest imaging with a reduction in noise isolation. Sub-bass response is greatly diminished, giving you the ability to attenuate to your preferences based on music type and mix. It is ideally used for recordings that do not capture much sub-bass content while containing a lot of spatial information. Because of the reduction in sub-bass response, it creates a slight tilt towards the high-frequency band. (reduction by 1db-10db at 350hz-20hz).
M20 Modules
Greatly increased sub-bass response while keeping the mid-bass clean. Works great for overly bright mixes, as it tilts the response towards the low end. While this module shrinks the sound-stage width, it works great for synth-heavy or modern pop music that doesn’t contain much acoustic spatial information. The m20 module also unlocks some of the missing sub information in older rock recordings. (increase by 1db2db at 40hz-20hz).
Foam Tips
Narrows the mix and shifts HF resonant peak down. More secure fit.
Spinfit
Shifts HF resonant peak up. Best at handling microphonics and occlusion effects. The nozzle is decoupled well from the silicone touching the ear canal.
Wide Nozzle
Staging is less localized with better panning blend. Hits target frequency response curve with m15 module.
Specifications
- TRANSDUCER TYPE/COUNT
2 balanced armature drivers, 1 tia driver, and 1 dynamic driver - TRANSDUCER CONFIGURATION
1 dynamic low, 1 BA low-mid, 1 BA high-mid, 1 tia high - FREQUENCY RESPONSE 10Hz – 20kHz
- SENSITIVITY 107 dB/mW @ 1kHz @ 1mW (94mV)
- IMPEDANCE 11Ω @1kHz
- CROSSOVER Integrated 4-way passive crossover
- ISOLATION
-20dB w/ m20 module
-15dB w/ m15 module
-10dB w/ mX module - CABLE
0.23 Ohms total impedance
7 x 7 x 4 Multi-twist Silver plated OCC copper wire
26 AWG
Included
- U4s Universal In-Ear Monitors
- 64 Audio Premium Leather Case
- TrueFidelity Foam Ear Tips (S,M,L)
- SpinFit Silicone Ear Tips (S,M,L)
- Silicone Ear Tips (S,M,L)
- 3.5mm Black Premium Cable
- Apex Modules: m20, m15, mX
- Cable Clip
- Cleaning Tool
- Round Sticker
Product Reviews
- Reviews
- Questions
Love it
Absolutely love the u4s. I use it daily for music and gaming. Very happy with this purchase.
Best Sound IEM Ever Experienced
I Like the Apex isolation.
Like owning a personal four-member band
If I had to give an elevator pitch for the 64 Audio U4s, I would describe them as a four-member band crammed into an IEM housing. The four band members — in order of priority — are the bass, treble, lower-mids, and upper-mids. Bass: The bass of the U4s can best be characterized as amorphous; it's able to tighten up when a song calls for it and present itself in a more diffused way when it's time to get out of the way of the other parts of the frequency response. Despite the bass being the part of the frequency response that typically stands out the most to me, I wouldn't go so far as to classify the U4s as bass-head IEMs. A more apt description would be bass-driven, just as a band's rhythm section is often its driving force. This likening is because of the leadership role that the bass plays in the U4s, I found doing anything to reduce the U4s' bass to do them a disservice. Treble: Cuts through the bass, providing a nice sense of contrast. Lower Mids: This part of the frequency response has a subtle vibrato at times, kind of like a bow being pulled across the string of a cello. I also suspect that this part of the frequency response not being adjacent to the bass in terms of priority allows the lower mids to meaningfully contrast with the bass. Upper Mids: The most neutral part of the frequency response. I suspect this region will be the most controversial one. However, I believe this was done to serve as a point of reference for the other three more iconic parts of the frequency response. It's also worth noting that I wouldn't consider this part of the frequency response to be recessed, but rather that it doesn't seem to have been elevated relative to the other parts of the frequency response. It could also be argued that the relative recession of this region invites the listener to "lean in" to hear what's happening, which I consider a cool, alternative way to draw attention to a part of the frequency response. I suspect that each of the four parts of the frequency response I heard could be mapped to one of the four drivers in the U4s, with the dynamic driver handling the bass, the Tia driver handling the treble, one regular BA handling the lower mids, and the other regular BA handling the upper mids. I've never heard an IEM that gave me the ability to distinguish all of its drivers from each other, so this was a pleasant surprise. Recommended Tracks 1. "Haunted Jukebox" by Saint Etienne 2. "On Fire" by Sebadoh 3. Close to Me" by Juls 4. "Issues / Hold On" by Teyana Taylor
Very fun IEM
I just loved this IEM, I’d describe it as very fun/energetic with powerfull bass and yet impressive resolution, zero fatigue when listening for long periods. A great all arounder in my opinion, worked well with every music style I played with it, but I listen mainly jazz, blues and rock, definitly a keeper in this price range.
Best IEM’s I’ve heard, at any price
This is my 5th pair of IEMs and my first from 64 Audio, and I was immediately blown away. Sound is clear, crips across the entire range. Bass is noticeable, more so than in some other IEMs, but certainly not over-prevalent or artificial. Good balance of driver quantity and size - they fit perfectly in my ears for hours with no fatigue or discomfort. And the service from Audio 46 was superb. Great experience all around.
