64 Audio at Audio46

64 Audio U12t Universal In-Ear Monitor (Latest revision)



Product SKU: 64AU12T


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Product Details

Audio46's Opinion

It's not a stretch to say that 64 Audio's U12t is one of the most universally loved and respected IEMs in the $2000 price tier. With its balanced yet articulately warm tuning and the classic 64 Audio wrap-around-you-head imaging, what's not to love? As its name suggests, the U12t utilizes 12 balanced armature drivers, which feed into 64 Audio's proprietary Tia tubeless design. Traditional acoustic tubing is forgone in favor of specialized acoustic chambers, which deliver sound from the drivers to a listener's ear completely free of tubular resonance. With its exceptionally natural midrange, smooth yet highly resolving treble profile, and articulate low end that can find ample customization with the included APEX modules, the U12t will likely hold the $2000 throne in the IEM space for the foreseeable future.

↓ Details provided by 64 Audio

64 Audio U12t Universal In-Ear Monitor Overview Photograph

The U12t does it all, delivering immersive sound and impeccable spatial imaging. It's clean highs extend beautifully with a warm and engaging low-end response - just like its custom counterpart, the A12t. Offering reference-level detail, this IEM is among the best for multi-instrumentalists, engineers, sound monitors, and audiophiles.

Each ergonomic shell is machined out of a solid piece of aluminum and finished with an elegant brushed aluminum faceplate.


Exclusive technologies that challenge traditional in-ear monitor designs to give you the absolute best listening experience

64 Audio U12t Internal Structure

U12t features the following unique technology:


A tubeless design that reduces resonance 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. The U12t features two major elements of the tia system: the tia driver and the tia single-bore design.

Tia Driver

An open balanced armature speaker design for realistic resolution and transparency. By opening a balanced armature, the diaphragm becomes fully unobstructed, reducing resonance in the IEM and allowing sound to travel more naturally to the ear.

Tia Single Bore

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. The short sound path provides remarkable high-frequency extension and smoothness. The large single bore also allows for easier maintenance

64 Audio U12t Universal In-Ear Monitors Faceplate Design


Only from 64 Audio, apex alleviates listener fatigue by releasing air pressure sealed in the ear canal. This venting enables musicians and music enthusiasts to listen more comfortably for longer.

pex, 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).

Alleviate Listener Fatigue

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.

Extend The Soundstage

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.

Hear Your Audience

Custom in-ear monitors provide amazing isolation and help you hear your mix more clearly and at lower volumes than a wedge monitor or earbuds. Apex lowers decibel levels while preserving the clarity of the sounds around you, so artists on stage can connect with their audience while protecting their hearing.


Enables a consistent, reliable sound regardless of audio source.

LID, or Linear Impedance Design, 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 our IEMs, this model can be used with a wide range of personal audio devices as well as all hard-wired and wireless monitor systems.

Diagram of 64 Audio U12t In Ear Monitors


Driver Type/Count Twelve precision balanced armature drivers
Driver Configuration 1 tia high, 1 high-mid, 6 mid, 4 low
Frequency Response 10Hz – 20kHz
Sensitivity 108db dB/mW
Impedance 12.6 +1/-2 Ω from 10Hz – 20kHz
Crossover Integrated 4-way passive crossover
Isolation -20dB w/ m20 module, -15dB w/ m15 module, -10dB w/ mX module
Cable 1.2 m (Detachable)
Connection 3.5 mm Mini Jack, Angled


U12t Universal In-Ear Monitors
64 Audio Sticker
64 Audio Premium Leather Case
TrueFidelity Eartips (S,M,L)
Silicone Eartips (S,M,L)
48" Detachable Premium Cable
m20 apex Modules
m15 apex Modules
mX apex Modules

64 Audio U12t included accessories

Product Reviews


Customer Reviews
5.0 Based on 6 Reviews
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Filter Reviews:
Michael B.
United States

Amazing IEM’s with great service at audio 46

I’ve moved up the IEM ladder and have finally arrived at my top. Love at the U12t’s they seem to work well with so many different genres. I am also using them for sound design and mixing on the go and they work great. It’s so nice to be able to slightly change the profile with the APEX modules. I am so far loving the APEX mx as for me it provide a nice bass with a pretty wide soundstage. The only thing I am not crazy about is the cable. Coming from a smoky litz on Andromeda, I just preferred the feel. I am also glad to have found Audio46. Great rewards program and fast shipping even on smaller items. Amazing.

N M.
United States United States

Best IEMs I've ever owned

I was pleasantly surprised with the sound quality from the U12t. These have replaced my Audeze LCDi4 as a daily driver.

Virgilio G.
United States United States

Excellent store and service

I love this iem’s. They have an incredible sound with very high resolution and with the advantages of the apex modules to customize the sound to your personal preferences. Also I had the chance to visit the audio 46 store and it was great. Excellent service. I definitely buy again from them.

James T.
United States United States

End gamers for some beautiful for all

While I do have Empire Odens and am 9 Flagship headphones (Susvara, TC Abyss, LCD 5, Stax 900s) these are worthy of the top tier no matter how you look at it. Clean neutral (mostly) but still with the hint of "musicality" that I love. Highly recommend these to anyone who likes their music close to the source

John W.
United States United States

A Justified Extravagance

By the time you consider spending this much on an IEM, you’re likely to think about how marginal the improvements are likely to be against the outlay. But compared to the IEMs I possess at about half the price this is truly a different experience in depth and richness of sound. I get so enthralled it’s an effort to stop listening. I use them with an Effect Audio Cleopatra 4.4mm cable and Sony ZX507 DAP - just perfect.


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