64Audio U4s vs U12t
Introduction
The U4s and U12t are premium universal IEMs from 64Audio. Both in-ear monitors are designed to deliver top-tier sound to die-hard audiophiles, serious music producers, or onstage performers. Let's compare both models so you can decide which IEM suits your needs best.
Not the right fit? Browse other 64Audio In-Ear Monitors.
U4s vs U12t Price Comparison
The 64Audio U4s and U12t sit at very different price points within 64Audio's offerings.
The U4s comes in at $1,099.00.
The U12t comes in at $1,999.00.
The U12t costs almost twice as much as the U4s. Let's dive deep into the specs, design, sound signatures, and features of both so you can get a better idea of what each IEM brings to the table.
The 64Audio U4s
The U4s is a mid-range in-ear monitor designed for a fun and enjoyable listening experience. Under the hood, the U4s packs a powerful dynamic driver + BA driver hybrid, Apex Module Technology, Tia drivers, and Linear Impedance Design Technology.
64Audio U4s Features:
- Tubeless In-Ear Audio (tia)
- Air Pressure Exchange (Apex)
- Linear Impedance Design (LID)
64Audio U4s Specs:
Driver Configuration: 1 tia High Driver – 1 High-Mid Driver – 1 Mid Driver – 1 Dynamic Low Driver
Frequency Response: 10hz – 20kHz
Sensitivity: 107 dB/mW Sensitivity @1kHz
Crossover: Integrated 4-way Passive Crossover
Impedance: 11Ω Impedance @1kHz
Apex Technology Isolation: Apex Technology Isolation: -20dB, -15dB, -10dB
The 64Audio U12t
The U12t is a high-end universal in-ear monitor from 64Audio. It is one of their most popular models, sporting a 12-driver configuration consisting of Balanced Armatures and 64Audio's patented tia driver. The U12t features 64Audio technologies like Apex, Tia, and Linear Impedance Design for unmatched comfort and sound.
64Audio U12t Features:
- Tubeless In-Ear Audio (tia)
- Air Pressure Exchange (Apex)
- Linear Impedance Design (LID)
64Audio U12t Specs:
Driver Configuration: 1 tia High Driver – 1 High-Mid Driver – 6 Mid Driver – 4 Low Driver
Frequency Response: 10hz – 20kHz
Sensitivity: 108 dB/mW @1kHz
Crossover: Integrated 4-way Passive Crossover
Impedance: 12.6 +1/-2 Ω from 10hz – 20kHz
Apex Technology Isolation: -20dB, -15dB, -10dB
Design and Build Quality
The U4s and U12t share a similar half-moon shell shape but that's where the similarities end. The U4s sports the classic 64Audio industrial shell design while the U12t has been updated for 2025 with new paint, faceplate materials, accents, and more.
The U4s features 64Audio's precision-machined aluminum shell for a lightweight yet robust feel. In terms of aesthetics, the U4s features a unique Slate Blue colorway with faceplates inspired by Muonionalusta Meteorite Fragments for a strikingly unique look. At the front you'll find the Apex Ports and 64Audio branding.
The U12t has been given a makeover for 2025. In the past, the U12t looked identical to the U4s apart from their color and faceplate design. The new U12t sports a Textured Silver Shell Color, Raised Metal Logos, and Chamfered Faceplate Bezel for a more elegant look and feel. At front you'll find the Apex ports under the chamfered 64Audio logo.
Sound Signature
You're probably looking to see how these IEMs stack up on sound. We'll share our thoughts here, although keep in mind this information tends to be anecdotal and subjective.
U4s Sound Signature
The U4s is tuned for audiophiles looking for a fun yet detailed sound. Its powerful dynamic driver delivers deep, punchy bass, which adds satisfying thickness to the over all sound. The BA drivers and tia high-driver delivers clean, crisp, and detailed vocals and instrumental playback, making the U4s a versatile IEM that allows you to enjoy just about any genre.
U12t Sound Signature
The U12t features a neutral, reference-level tuning known for its accurate, detailed, and immersive sound presentation.
It is the perfect in-ear monitor for anyone looking to scrutinize every note and detail in their favorite music. The bass in the U12t is tight yet powerful. Its midrange is natural and clear, allowing voices to come through with life-like clarity. Its soundstage is one of the largest you'll hear in an IEM, offering accurate sound placement.
Price and Value
The 64Audio U4s and U12t sit in very difference price points within 64Audio's product stack. Each one is built with 64Audio's high-quality standards, yet each IEM carries a slightly different value proposition.
The U4s is intended for the budding audiophile looking to dip their toes into high-end IEMs. The $1,099 U4s, is anything but cheap, but you're getting solid build quality and a real taste of hi-fi sound with these IEMs. You also get to enjoy 64Audio tech like Apex Modules, tia, and LID, and you get a decent set of accessories in the box.
The $1,999 U12t delivers true endgame sound - it doesn't get much better than this IEM in terms of clarity, detail, and immersion. The 2025 version is even better - delivering the same sound audiophiles have come to love but with a fresh new look and a generous set of accessories in the package. The U12t packs 64Audio features like Apex, tia, and LID, and now comes with all the current Apex Modules in the box, alongside a pair of Pearl Premium Cables in 3.5mm & 4.4mm.
Our Thoughts
Apart from sound, the U4s and U12t are similar IEMs. Both feature 64Audio's premium shell quality and pack 64Audio features Apex, tia, and LID. However, that's where the similarities end.
The U4s is the IEM to get if you're looking for a taste of hi-fi without breaking the bank. Its powerful hybrid driver configuration ensures your music sounds fun and exciting while pushing clarity and detail to a whole new level. With Apex technology, you can enjoy pressure-free listening sessions and fine-tune sound to your preferences.
The 64Audio U12t is a very popular IEM known for delivering exceptional resolution, detail, tone, and soundstage immersion. It is the IEM to get if you're looking to experience your music like never before. Everything on the U12t just sounds clean, clear, and accurate. The 2025 version is even better - boasting an updated design and accessories package without the extra cost. Like the U4s, you can swap out Apex Modules to fine-tune sound to your liking.
Another IEM to consider in this price range is the Noble Audio AGIS II IEM - the successor to Noble Audio's Spartacus. The AGIS II packs an 8-driver hybrid configuration, a stunning faceplate design, and a comfortable shell shape.
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