64 Audio Solo | Planar Magnetic Universal IEMs

Feast Your Eyes on 64 Audio's Solo, the Final Note in the Tia® Line, Featuring the Most Striking Housing Update Since 2016

• (1x) 14.2mm Planar Magnetic Driver
• Features the world's first Helmholtz resonator in an IEM
• Built with 64 Audio's in-house tech: Tia®, Apex Core, LID (Linear Impedance Design), and Helmholtz resonators
• T6061 Aluminum shell, copper faceplate mesh
• Includes 3.5mm + 4.4mm OCC Pure Copper cables
• Check out our measurement of Solo

Introducing Solo

Redefining the meaning of “full-range sound” in portable high-end audio, Solo expertly covers the entire sonic spectrum with a single 14.2mm planar driver. The final note in 64 Audio's legendary Tia® line of UIEMs has been years in the making. Staying true to the tech-disruptive legacy of Fourté, Trio, and Duo, they 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, they introduced the world’s first Helmholtz resonator in an IEM.

Combined with their patented LID technology, all of these innovations are housed in 64 Audio's 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 for 64 Audio's 1st ever single-driver UIEM.

Sound

Being a 64 Audio product demands adherence to strict standards of accuracy, musicality, and balance while also offering something unique enough to earn a place among our legendary lineup of UIEMs. The scale to which Solo fulfills this is magnified by the fact that it employs a completely new speaker technology for them, achieving it all with a single driver per side.

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. 64 Audio's 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.

Planar Magnetic Driver

The planar magnetic driver features a flat diaphragm with embedded conductors suspended between two sets of magnets, unlike traditional dynamic drivers that utilize a conical diaphragm driven by a voice coil. Because the entire diaphragm moves uniformly due to the planar magnetic field, it can deliver the detail and micro-transient information that would typically require a dedicated high- frequency driver. Since the diaphragm isn’t driven by a voice coil attached to a cone, which can cause uneven movement, we can reliably extract a true high-resolution full range sound from this single driver.

Technology

Helmholtz Resonators
To offer a new perspective on Planar Magnetic technology, 64 Audio needed a combination of a slight but broad reduction in high frequency amplitude and the attenuation of a few very narrow frequency bands.

For effective control of problematic frequencies, they drew on years of research into Helmholtz resonators, an acoustic device from the mid-19th century. The two micro-cavities, 3D printed into Solo’s sound chamber, operate by forcing air in and out, causing the air inside to resonate at a specific frequency. By precisely determining the dimensions of the cavity and its neck, they can target a very narrow resonant frequency to amplify or diminish.

LID
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.

Apex® Core
Adding to their list of innovations, they implement 64 Audio's 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 their integrated apex core technology, they 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 their patented technology.

Copper 8-Braid Cable

Solo is being paired with 64 Audio's first pure copper cable. The OCC Copper, which is 23 x 25 AWG Wires, is built into 8 braids with a pleasant tactile feel as well as an impressively low 0.26Ω impedance rating. Solo comes standard with two of these cables, one SE 3.5mm and one balanced 4.4mm.

Specifications

• Transducer: 14.2mm Planar Magnetic driver
• Frequency Response: 20Hz - 20kHz
• Sensitivity: 100 dB/mW @1kHz
• Impedance: 16Ω @1kHz
• Isolation: -12 dB
  
• Cable:
  • 0.26Ω impedance
  • OCC Pure copper
  • 25 AWG + 23 wires
  • 3.5mm SE + 4.5mm BAL
• 64 Audio 1 Year Warranty

In the Box

• Solo IEMs
• Carry case
• Foam + silicone ear tips
  
• 2-Pin cables
• Cleaning tool + cloth
• Shirt clip