64 Audio 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 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.

Tia technology

• 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.

Apex core technology

• Air Pressure Exchange (Apex) 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 three module variations for U4s: mX, m15, and m20.

LID technology

• 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 across them, depending on the increase in resistance. Restoring proper interaction with the source and preserving the desired sound signature enables a consistent reliable sound.

Electric Low-Pass Filter Techonolofy

• A crossover circuit replacing 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.

Specs:

• Drivers: 4
• Driver Configuration : 1 tia High Driver – 1 High-Mid Driver – 1 Mid Driver – 1 Dynamic Low Driver
• Frequency Response: 10Hz - 20KHz
• Sensivity: 107 dB/mW Sensitivity @1kHz
• Impedance: 11Ω Impedance @1kHz
• Crossover: Integrated 3-way Passive Crossover
• Isolation: Apex Technology Isolation: -20dB, -15dB, -10dB
• Premium Cable 3,5mm
• Included: u4s Universal in-Ear monitors, 64 Audio premium leather case, TrueFidelity foam eartips (S,M,L), SpinFit Silicone Eartips (S,M,L), Silicone Eartips (S,M,L), 3.5mm Black Premium Cable, Apex modules: m20/m15/mx, Cleaning Tool, Cable Clip, Round Sticker