TWELVE Ti
test text
Solo
Universal
Fitting
1
Driver
$1,399.00
USD
Redefining the meaning of “full-range sound” in portable high-end audio, Solo expertly covers the entire sonic spectrum with a single planar driver. The final note in our legendary tia™ line of UIEMs has been years in the making. Staying true to the tech-disruptive legacy of Fourté, Trio, and Duo, we looked to the past for innovative solutions to the modern challenge of tuning a single driver. In addition to a traditional electronic filter that subtly shifts the tonal balance, we have introduced the world’s first Helmholtz resonator in an IEM.
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.
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.
Sound
The 14.2mm planar driver’s acoustic chamber integrates two Helmholtz resonators, meticulously tuned to acoustically sculpt its frequency response. This chamber is also engineered to include our apex core design, expertly relieving pneumatic pressure and enhancing the sense of physical space to a degree never before experienced in a single-driver IEM. Combined with our patented LID technology, all of these innovations are housed in our most striking design update since the introduction of Fourté in 2016. These elements unite to deliver a sound that is quintessentially 64 Audio, combining the exceptionally detailed transient response of planar technology with an unexpectedly robust low-frequency presence.
TWELVE Ti does it all, delivering immersive sound and impeccable spatial imaging. Its articulate highs extend beautifully with a warm and engaging low-end response - just like its custom counterpart, the A12t.
Offering reference-level detail, this IEM has become one of the most highly regarded and sought after audiophile UIEMs. Each ergonomic shell is machined out of a solid piece of titanium in a matte natural color finish.
TWELVE Ti does it all, delivering immersive sound and impeccable spatial imaging. Its articulate highs extend beautifully with a warm and engaging low-end response - just like its custom counterpart, the A12t.
Offering reference-level detail, this IEM has become one of the most highly regarded and sought after audiophile UIEMs. Each ergonomic shell is machined out of a solid piece of titanium in a matte natural color finish.
Pearl Premium Cable
U12t is the first UIEM that will come standard with our Pearl Premium Cable including both 3.5mm single-ended and one balanced 4.4mm.
TWELVE Ti Shielded Cable
Specially crafted for TWELVE Ti, this four-core cross-braided cable completes the look for a head to toe titanium aesthetic. Made from silver-plated, single-crystal copper (UP-OCC), it offers outstanding noise shielding and transparent signal transmission, with a low impedance of just 0.29Ω.
Included
Solo 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 OCC Copper Cable
Shirt Clip
Cleaning Tool
Cleaning Cloth
Cables
3.5 MM + 4.4 MM
OCC Copper
25 AWG + 23 Wires
0.32 Ω
Featured Technology
Tubeless In-Ear Audio is a patented IEM design methodology that aims to reduce unwanted resonance and distortion for a transparent and lifelike sound signature. The tia system consists of three major elements: open balanced armature tia drivers, the tia single-bore design, and tia acoustic chambers. Volür features two major elements of the tia system: the tia driver and the tia single-bore design.
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. TWELVE Ti features two major elements of the tia system: the tia driver and the tia single-bore design.
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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. TWELVE Ti features two major elements of the tia system: the tia driver and the tia single-bore design.
Adding to our list of innovations, we implement our patented pressure-relieving technology in the form of apex core, elevating this design to new levels of fidelity and spatial acuity. Because Solo’s acoustic chamber includes our integrated apex core technology, we achieve a similar fit and comfort to that of the Duo. The design offers just enough isolation to allow the listener to focus on the audio while feeling so unoccluded that you may initially wonder if you have a proper seal. This ensures hours of comfortable listening, made possible by our patented technology.
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 four module variations for TWELVE Ti: mX, m12, m15 and m20.
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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 TWELVE Ti: mX, m12, m15, and m20.
Linear Impedance Design (LID) is a patented circuit that compensates for the non-linear electrical resistance resulting from Solo’s electronic shelf filter. Variations in source amplifier output impedance in devices like smartphones, body packs, DAC/amps, and DAPs typically lead to changes in frequency response. LID restores proper interaction with the source, preserving the intended sound signature and ensuring consistent, reliable performance.
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.
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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.
Tubeless In-Ear Audio is a patented IEM design methodology that aims to reduce unwanted resonance and distortion for a transparent and lifelike sound signature. The tia system consists of three major elements: open balanced armature tia drivers, the tia single-bore design, and tia acoustic chambers. Solo features two major elements of the tia system: the single-bore design and micro-acoustic chambers.
Adding to our list of innovations, we implement our patented pressure-relieving technology in the form of apex core, elevating this design to new levels of fidelity and spatial acuity. Because Solo’s acoustic chamber includes our integrated apex core technology, we achieve a similar fit and comfort to that of the Duo. The design offers just enough isolation to allow the listener to focus on the audio while feeling so unoccluded that you may initially wonder if you have a proper seal. This ensures hours of comfortable listening, made possible by our patented technology
Linear Impedance Design (LID) is a patented circuit that compensates for the non-linear electrical resistance resulting from Solo’s electronic shelf filter. Variations in source amplifier output impedance in devices like smartphones, body packs, DAC/amps, and DAPs typically lead to changes in frequency response. LID restores proper interaction with the source, preserving the intended sound signature and ensuring consistent, reliable performance.
Tubeless In-Ear Audio is a patented IEM design methodology that aims to reduce unwanted resonance and distortion for a transparent and lifelike sound signature. The tia system consists of three major elements: open balanced armature tia drivers, the tia single-bore design, and tia acoustic chambers. Solo features two major elements of the tia system: the single-bore design and micro-acoustic chambers.
Adding to our list of innovations, we implement our patented pressure-relieving technology in the form of apex core, elevating this design to new levels of fidelity and spatial acuity. Because Solo’s acoustic chamber includes our integrated apex core technology, we achieve a similar fit and comfort to that of the Duo. The design offers just enough isolation to allow the listener to focus on the audio while feeling so unoccluded that you may initially wonder if you have a proper seal. This ensures hours of comfortable listening, made possible by our patented technology
Linear Impedance Design (LID) is a patented circuit that compensates for the non-linear electrical resistance resulting from Solo’s electronic shelf filter. Variations in source amplifier output impedance in devices like smartphones, body packs, DAC/amps, and DAPs typically lead to changes in frequency response. LID restores proper interaction with the source, preserving the intended sound signature and ensuring consistent, reliable performance.
Specifications
Color
Titanium
Material
Tc4 Titanium Shell and Faceplate
Exclusive Tc4 Titanium m20 apex Module
Electroformed Stainless Steel Faceplate Chip
Driver Configuration
1 tia High Driver
1 High-Mid Driver
6 Mid Drivers
4 Low Drivers
Frequency Response
10 Hz – 20 kHz
0.78mm 2-Pin Cables
24 AWG 4-Core Litz Cable
99 Strands Per Core
Silver-Plated UP-OCC Copper
0.29 Ω Total Impedance
Sensitivity
108 dB/mW @ 1 kHz
Impedance
12.6 Ω
Apex Isolation
-10db to -20db
Included
TWELVE Ti 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)
3.5 mm Shielded Cable
4.4 mm Balanced Shielded Cable
Shirt Clip
Cleaning Tool
Cleaning Cloth
Round Sticker
Apex Modules (m20, m15, m12, mX)
| Color Black | Frequency Response 20 Hz – 20 kHz | Isolation -12 dB |
| Material T6060 Aluminum Shell | Impedance 16 Ω | Cables 4.4 mm Copper Eight-Braid |
|
14.2 mm Planar Magnetic |
100 dB/mW @ 1 kHz |
Solo Universal In-Ear Monitors |
Designed, Assembled, and QC’d by highly skilled technicians in the United States using components sourced both domestically and globally from trusted suppliers.
Redefining the meaning of “full-range sound” in portable high-end audio, Solo expertly covers the entire sonic spectrum with a single planar driver. The final note in our legendary tia™ line of UIEMs has been years in the making. Staying true to the tech-disruptive legacy of Fourté, Trio, and Duo, we looked to the past for innovative solutions to the modern challenge of tuning a single driver. In addition to a traditional electronic filter that subtly shifts the tonal balance, we deploy a dual Helmholtz Resonator for precise tonal adjustments.
Redefining the meaning of “full-range sound” in portable high-end audio, Solo expertly covers the entire sonic spectrum with a single planar driver. The final note in our legendary tia™ line of UIEMs has been years in the making. Staying true to the tech-disruptive legacy of Fourté, Trio, and Duo, we looked to the past for innovative solutions to the modern challenge of tuning a single driver. In addition to a traditional electronic filter that subtly shifts the tonal balance, we deploy a dual Helmholtz Resonator for precise tonal adjustments.
The 14.2mm planar driver’s acoustic chamber integrates two Helmholtz Resonators, meticulously tuned to acoustically sculpt its frequency response. This chamber is also engineered to include our apex core design, expertly relieving pneumatic pressure and enhancing the sense of physical space to a degree never before experienced in a single-driver IEM. Combined with our patented LID technology, all of these innovations are housed in our most striking design update since the introduction of Fourté in 2016. These elements unite to deliver a sound that is quintessentially 64 Audio, combining the exceptionally detailed transient response of planar technology with an unexpectedly robust low-frequency presence.
Sound
Specifications
Color
• Titanium
Material
• Tc4 Titanium Shell and Faceplate
• Exclusive Tc4 Titanium m20 apex Module
• Electroformed Stainless Steel Faceplate Chip
Driver Configuration
• 1 tia High Driver
• 1 High-Mid Driver
• 6 Mid Drivers
• 4 Low Drivers
Frequency Response
• 10 Hz – 20 kHz
Impedance
• 12.6 Ω
Sensitivity
• 108 dB/mW @ 1 kHz
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 Ω Total Impedance
Included
• TWELVE Ti 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)
• 3.5 mm Shielded Cable
• 4.4 mm Balanced Shielded Cable
• Shirt Clip
• Cleaning Tool
• Cleaning Cloth
• Round Sticker
• Apex Modules (m20, m15, m12, mX)
Color
Black
Material
T6060 Aluminum Shell
Copper Faceplate Mesh
Driver Configuration
14.2 mm Planar Magnetic
Frequency Response
20 Hz – 20 kHz
Impedance
16 Ω
Sensitivity
100 dB/mW @ 1 kHz
Isolation
-12 dB
Cables
OCC Copper
25 AWG + 23 Wires
0.26 Ω
Included
Solo 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 Copper Eight-Braid Cable
4.4mm Copper Eight-Braid Cable
Shirt Clip
Cleaning Tool
Cleaning Cloth
Designed, Assembled, and QC’d by highly skilled technicians in the United States using components sourced both domestically and globally from trusted suppliers.
Specifications
1 tia High Driver – 1 Dynamic Low Driver
20hz – 20kHz Frequency Response
98 dB/mW Sensitivity
Integrated 2-way passive crossover
9Ω Impedance
-12dB isolation apex core technology
Featured Technology
Rather than constricting the sound of the drivers by fitting a tube onto them, Duo’s complete Tia System reduces unwanted resonance and distortion by allowing the 9mm Dynamic Driver + Tia High Driver to radiate freely into the single large Tia bore with no obstructions to the front of the drivers.
Apex Core is a deeper understanding of air movement within an earphone system. Duo’s faceplate features a striking perforated grill that leaves the shell of the IEM open to the outside atmosphere for a less obstructed airflow resulting in an effortless reproduction of music and minimal physical fatigue.
Due to the high crossover point between the two drivers, Wave Sync was developed to ensure coherence; another industry first. By using a type of “all-pass” filter, we’re able to introduce a crossover while correcting for time without having to change the physical distance between the drivers.
Sound
The agile performance expected of a planar driver achieves maximum realism by extracting subtle details in the music. These transients emerge from the mix, seamlessly keeping pace with your focus on the primary elements of the song. Our acoustic notch filters are strategically placed to eliminate sharpness without compromising driver performance.
Apex core assists the high-mid and high frequencies in creating a vast sonic landscape, even in very complex mixes. Alongside this realism comes a tactile immersion in the textures of instruments and even the sonic characteristics of the recording equipment used in your favorite tracks. By intentionally shaping the overall response of Solo, we achieve a bass that has substantial impact and deep sub-bass presence.
Specifications
Color
Black
Material
T6060 Aluminum Shell
Copper Faceplate Mesh
Driver Configuration
14.2 mm Planar Magnetic
Frequency Response
20 Hz – 20 kHz
Impedance
16 Ω
Sensitivity
100 dB/mW @ 1 kHz
Isolation
-12 dB
Cables
4.4 mm Copper Eight-Braid
3.5 mm Copper Eight-Braid
Included
Solo 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)
Copper Eight-Braid Cables
Shirt Clip Cleaning Tool + Cloth
Designed, Assembled, and QC’d by highly skilled technicians in the United States using components sourced both domestically and globally from trusted suppliers.
Specifications
1 tia High Driver – 1 Dynamic Low Driver
20hz – 20kHz Frequency Response
98 dB/mW Sensitivity
Integrated 2-way passive crossover
9Ω Impedance
-12dB isolation apex core technology
Featured Technology
Rather than constricting the sound of the drivers by fitting a tube onto them, Duo’s complete Tia System reduces unwanted resonance and distortion by allowing the 9mm Dynamic Driver + Tia High Driver to radiate freely into the single large Tia bore with no obstructions to the front of the drivers.
Apex Core is a deeper understanding of air movement within an earphone system. Duo’s faceplate features a striking perforated grill that leaves the shell of the IEM open to the outside atmosphere for a less obstructed airflow resulting in an effortless reproduction of music and minimal physical fatigue.
Due to the high crossover point between the two drivers, Wave Sync was developed to ensure coherence; another industry first. By using a type of “all-pass” filter, we’re able to introduce a crossover while correcting for time without having to change the physical distance between the drivers.
Included
• Solo Universal In-Ear Monitors
• Carry Case
• TrueFidelity Foam Eartips (S,M,L)
• SpinFit Silicone Eartips (S,M,L)
• Silicone Eartips (S,M,L)
• 3.5mm Copper Eight-Braid Cable
• 4.4mm Copper Eight-Braid Cable
• Apex Modules: m20, m15, *m12, mX
• Cable Clip
• Cleaning Tool
• Cleaning Cloth
• Round Sticker