64 Audio TWELVE Ti Limited Edition Universal In-Ear Monitor (Open Box) [Grade A, Full Warranty]

The almost decade-long global success of U12t, reinforced in 2025 by its cosmetic update, is being commemorated with a special edition.

TWELVE Ti is exactly what the name suggests: U12t elevated through the use of an equally renowned element, titanium, for the shells, faceplates, and exclusive m20 apex modules. The strength, resilience, and bio-harmony of titanium, combined with the legendary sound of U12t, create the ultimate icon of timeless style and performance.

Ti-6Al-4V (Tc4) Titanium

Ti-6Al-4V (Grade 5) is the most widely used alpha beta titanium alloy, comprising ~90% Ti, 6% Aluminum, and 4% Vanadium. It offers an exceptional strength to-weight ratio, high corrosion resistance, and good bio-compatibility. Key applications include aerospace structural components, medical implants, high performance racing parts, and now, audiophile grade earphones.

Shielded Cable

This dedicated cable, specially crafted for TWELVE Ti, completes the look for a head to toe titanium aesthetic. The four-core cross-braided cable is made from silver-plated, single-crystal copper (UP-OCC), offering outstanding noise shielding and transparent signal transmission. With a low impedance of just 0.29Ω, it maximizes electrical efficiency.

• 0.78mm Non-Recessed 2-Pin
• 24 AWG 4-Core Litz Cable
• 99 Strands Per Core
• Silver-Plated UP-OCC Copper
• 0.29 Ohms Total Impedance

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. U12t 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 U12t: 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 12 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.

Specifications

• Driver Configuration: 1 tia High Driver, 1 High-Mid Driver, 6 Mid Drivers, 4 Low Drivers
• Frequency Response: 10Hz – 20kHz
• Sensitivity: 108dB @1kHz @1mW
• Impedance: 12.6Ω @1kHz
• Crossover: Integrated 4-way passive crossover
• Apex Isolation: -10dB to -20dB
• 0.78mm 2-Pin Cables: 24 AWG 4-Core Litz Cable, 99 Strands Per Core, Silver-Plated UP-OCC Copper, 0.29 Ohms Total Impedance
• Material: Tc4 Titanium shell, faceplate, and apex m20 module
• Technology: apex, tia, LID

Included

• Universal In-Ear Monitors
• Carry Case
• TrueFidelity Foam Ear Tips (S, M, L)
• SpinFit Silicone Ear Tips (S, M, L)
• Silicone Ear Tips (S, M, L)
• 3.5mm Shielded Cable
• 4.4mm Balanced Shielded Cable
• Shirt Clip
• Cleaning Tool
• Cleaning Cloth
• Round Sticker
• Apex Modules (m20, m15, m12, mX)