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.


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.

TIA SYSTEM

The tia system is comprised of three major elements: open balanced armature tia drivers, the tia single-bore design, and tia acoustic chambers. The U12t features two major elements of the tia system: the tia driver and the tia single-bore design. The Tia Driver is an open balanced armature speaker design for realistic resolution and transparency. The Tia Single-bore is a huge advancement in eliminating unwanted tube resonance. The large bore itself serves as a sound-shaping chamber and aids the tia high driver in delivering a linear and coherent frequency response.

APEX - AIR PRESSURE EXCHANGE

Apex, or Air Pressure Exchange, is a pneumatically interactive vent that releases air pressure from a sealed ear canal. Apex comes in two variations, m15 (-15dB) and m20 (-20dB). When you seal a miniature speaker in an ear canal, the air inside becomes trapped. Apex relieves this air pressure, allowing the eardrum to move naturally, so you can comfortably listen longer. Freely moving air extends the soundstage and provides a more natural listening experience. It also preserves bass frequencies and helps the listener distinguish individual instruments.

LID - LINEAR IMPEDANCE DESIGN

LID, enables a consistent, reliable sound regardless of what source. This proprietary circuit corrects the non-linear impedances of the drivers, restoring proper interaction with the source and preserving the desired sound signature. Whether you're a musician plugging into a variety of gear at different gigs or studios, or an audiophile listening from low-impedance sources, LID ensures your IEMs are delivering the desired sound signature consistently. And like all 64 Audio IEMs, this model can be used with a wide range of personal audio devices as well as all hard-wired and wireless monitor systems.

ELECTRICAL LOW PASS FILER

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.

64 Audio U4s - Four Drivers Universal IEM

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£1,099.00
£1,099.00
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Pay in 3 Interest-free payments on purchases from £30 - £2000

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.


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.

TIA SYSTEM

The tia system is comprised of three major elements: open balanced armature tia drivers, the tia single-bore design, and tia acoustic chambers. The U12t features two major elements of the tia system: the tia driver and the tia single-bore design. The Tia Driver is an open balanced armature speaker design for realistic resolution and transparency. The Tia Single-bore is a huge advancement in eliminating unwanted tube resonance. The large bore itself serves as a sound-shaping chamber and aids the tia high driver in delivering a linear and coherent frequency response.

APEX - AIR PRESSURE EXCHANGE

Apex, or Air Pressure Exchange, is a pneumatically interactive vent that releases air pressure from a sealed ear canal. Apex comes in two variations, m15 (-15dB) and m20 (-20dB). When you seal a miniature speaker in an ear canal, the air inside becomes trapped. Apex relieves this air pressure, allowing the eardrum to move naturally, so you can comfortably listen longer. Freely moving air extends the soundstage and provides a more natural listening experience. It also preserves bass frequencies and helps the listener distinguish individual instruments.

LID - LINEAR IMPEDANCE DESIGN

LID, enables a consistent, reliable sound regardless of what source. This proprietary circuit corrects the non-linear impedances of the drivers, restoring proper interaction with the source and preserving the desired sound signature. Whether you're a musician plugging into a variety of gear at different gigs or studios, or an audiophile listening from low-impedance sources, LID ensures your IEMs are delivering the desired sound signature consistently. And like all 64 Audio IEMs, this model can be used with a wide range of personal audio devices as well as all hard-wired and wireless monitor systems.

ELECTRICAL LOW PASS FILER

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.
Specification Value
Driver Type/Count Four (4) precision balanced armature drivers
Driver Configuration 1 tia high, 1 hi-mid, 1 mid, 1 low
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, *-12dB
Easy Returns
Secure Checkout
Pay in 3 Interest-free payments on purchases from £30 - £2000
  • 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, *m12, mX
  • Cable Clip
  • Cleaning Tool
  • Round Sticker
  • 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, 1 High-Mid, 2 Mid, 2 Low with 4-way crossover
  • Black Premium detachable silver-plated audio cable
  • *m12 apex modules exclusively available with U4s
Delivery & Returns Information

Item Ships from our UK Warehouse - Typical delivery is 3 - 5 business days for mainland UK. OTIC can be contacted for updates.

Free shipping on all baskets over £250.

We offer a refund on any unused items, subject to our returns policy.

Click here to view all delivery & returns info - including shipping, tax, and duty information for International Customers.

Products purchased from OTIC Audio are supplied with a manufacturer warranty that is specified on the product page on our website. Most products come with a 1Y manufacturer warranty (or 3 months for B-grade, open box, refurbished, ex-demo, and second-hand items).

The manufacturer's warranties are limited to physical defects in the materials, parts, and workmanship used in making the product. Abnormal conditions, deliberate abuse, and damage due to accidents, operator's error, or unauthorized service attempts are excluded from any warranty claims.

Faulty goods returned under the manufacturer's warranty are to be returned to OTIC Audio at the cost of the customer. OTIC Audio will cover the cost of shipping the repaired or replacement product back to the customer.

64 Audio U4s - Four Drivers Universal IEM

64 Audio U4s - Four Drivers Universal IEM

£1,099.00

64 Audio U4s - Four Drivers Universal IEM

£1,099.00

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