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64 Audio U4s - Four Drivers Universal IEM Earphones with Detachable Cable

Key Features:

  • Four driver universal-fit in-ear monitor with fully tubeless design
  • Softer presentation of a mix with beautiful upper-mid imaging and realistic presentation
  • Tia tubeless design reduces resonance for a transparent and lifelike sound signature
  • Apex system alleviates listener fatigue by releasing air pressure sealed in the ear canal
  • LID (Linear Impedance Design) enables a consistent, reliable sound regardless of audio source
  • Electrical Low-Pass Filter lowers distortion by eliminating unwanted frequencies
  • 1 tia High Driver – 1 High-Mid Driver– 1 Mid Driver – 1 Dynamic Low Driver
  • Black Premium detachable silver-plated audio cable
  • Manufacturer warranty: 12 months

Product Data:

MSRP KSD SKU Barcode MPN
£1,099.00 P003072 850035627051 U4s
MSRP £1,099.00
KSD SKU P003072
Barcode 850035627051
MPN U4s

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64 Audio U4s

A quad driver hybrid UIEM featuring ground-breaking patented technologies originally developed for 64 Audio'S 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.

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 low- frequency distortion.

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Tia®
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®
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®
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.

Electrical Low Pass Filter
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.

Features

  • Four driver universal-fit in-ear monitor with fully tubeless design
  • Softer presentation of a mix with beautiful upper-mid imaging and realistic presentation
  • Tia tubeless design reduces resonance for a transparent and lifelike sound signature
  • Apex system alleviates listener fatigue by releasing air pressure sealed in the ear canal
  • LID (Linear Impedance Design) enables a consistent, reliable sound regardless of audio source
  • Electrical Low-Pass Filter lowers distortion by eliminating unwanted frequencies
  • 1 tia High Driver – 1 High-Mid Driver– 1 Mid Driver – 1 Dynamic Low Driver
  • Black Premium detachable silver-plated audio cable

Package Includes

  • 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

Technical Specifications

  • Driver Type/Count:(4) 3 precision balanced armature drivers + 1 Dynamic
  • Driver Configuration: 1 tia High Driver – 1 High-Mid Driver– 1 Mid Driver – 1 Dynamic Low Driver
  • Frequency Response: 10Hz – 20kHz
  • Sensitivity: 105 dB/mW
  • Impedance: 6Ω Nominal
  • Crossover: Integrated 4-way passive crossover
  • Cable: Black Premium Cable, 0.23 Ohms Total Impedance, 7 x 7 x 4 Multi-Twist, Silver Plated OCC Copper Wire, 26 AWG, Terminated in 3.5mm
  • Apex Technology Isolation: -20dB, -15dB, -10dB
More product information on the 64 Audio website

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