64 Audio TWELVE Ti | Special Edition Balanced Armature Universal IEMs

The Almost Decade-Long Global Success of U12t, Reinforced in 2025, is Being Commemorated With a Special Edition Version, TWELVE Ti

Special edition version of the 64 Audio U12t
Built with titanium shell, faceplate, and exclusive m20 apex module
Features 64 Audio's proprietary technologies
Includes specially crafted copper cable


TWELVE Ti
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-6AI-4V (Tc4) Titanium
Ti-6AI-4V (Grade 5) is the most widely used alpha-beta titanium alloy, comprising of ~90% Ti, 6% Aluminum, and 4% Vanadium. It offers 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.
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 of resistance. Restoring proper interaction with the source and preserving the desired sound signature enables a consistent reliable sound.
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 0.29 ohms, it maximizes electrical efficiency.
Specifications


Driver Configuration

1 tia High
1 High-mid
6 Mid
4 Low



Frequency Response: 10Hz-20kHz

Sensitivity: 108dB @1kHz @1mw

Impedance: 12.6 ohms @1kHz

Crossover: Integrated 4-way passive

Apex Isolation: -10dB to -20dB

Cable

24AWG 4-core litz
99 strands per core
Silver-plated UP-OCC copper
0.29 ohms total impedance



In the Box

64 Audio TWELVE Ti IEMs
Carry case
TrueFidelity foam ear tips
SpinFit silicone ear tiips
Silicone ear tips
3.5mm shielded cable
4.4mm balanced shielded cable
Shirt clip
Cleaning tool + cloth
Sticker
Apex modules