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The new 64 Audio U4s is 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 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.
The 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.
The U4s features an ergonomic anodized aluminum shell and 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 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.
tia. Tubeless In Ear Audio
Tubeless In-Ear Audio (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.
LID. Linear Impedance Design
Smartphones, body packs, amps, and DAPs produce audio with different output impedances. The interaction of the earphone impedance curve with the sources may result in the same IEM sounding different with different sources.
LID is a proprietary circuit that corrects the non-linear impedances of the multiple driver-sets that comprise this six-driver IEM, restoring proper interaction with the source and preserving the desired sound signature, so you can enjoy the same sound reliably across sources.
Electrical Low Pass Filter
An acoustic damper (old technology) doesn’t actually prevent frequencies from getting to the driver, it merely blocks frequencies from getting to the ear. At higher volumes acoustic dampers can introduce unwanted distortion through vibration and air movement.
64 Audio's electrical low pass filter lowers distortion by eliminating unwanted frequencies. It does this with an electrical circuit that eliminates target frequencies before they even reach the driver.
apex. Air Pressure Exchange
Apex is a patented vent that releases air pressure in a sealed ear canal all while retaining a level of isolation; this venting alleviates listener fatigue and allows for a much more realistic soundstage.
When you seal a miniature speaker in an ear canal, the air inside becomes trapped. As the speaker produces sound, it moves the air and causes the eardrum to work excessively. The pneumatic pressure exerted on the eardrum causes ear fatigue. Apex relieves this pressure, allowing the eardrum to move naturally, so you can comfortably listen longer.
Apex enables air to move freely in the ear canal, which extends the perceived soundstage and allows for a more natural listening experience. Everything from inserting, wearing, and removing the IEMs becomes a much more natural and painless process.
Apex is implemented in U4s via interchangeable modules, so you can quickly switch between different levels of isolation and sound signatures. Although the modules technically only affect the low frequencies, this psychoacoustically affects your perception of the whole frequency range.
- The m20 module (-20dB noise isolation) greatly increases 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.
The m15 module (-15dB noise isolation) is fitted to U4s by default, allowing you to hear the clarity of your music along with some of your surroundings.
The m12 module (-12dB noise isolation) is brand new, launching as a bonus with U4s. It was developed for those who felt that the bass drop between m15 and mX was too drastic, and is perfect for tracks where the bass is just slightly overpowering the rest of the spectrum. Increases mid-range punch.
The mX module (-10dB noise isolation) delivers the 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 in perception towards high frequencies.
1 tia High Driver – 1 High-Mid Driver – 1 Mid Driver – 1 Dynamic Low Driver
10hz – 20kHz Frequency Response
105 dB/mW Sensitivity @1kHz
Integrated 4-way Passive Crossover
6Ω Impedance @1kHz
Apex Technology Isolation: -20dB, -15dB, -10dB, -12dB
Included In The Box:
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
0.23 Ohms Total Impedance
7 x 7 x 4 Multi-Twist
Silver Plated OCC Copper Wire
Terminated in 3.5mm
Apex Modules: m20, m15, *m12, mX