ACS VIORA + JANUS is a dual-mode monitoring system designed to take musicians seamlessly from studio to stage.

In universal mode, VIORA delivers a flat, faithful, and uncolored sound, ideal for recording, arranging, and rehearsals. Once fitted with JANUS custom sleeves, it transitions into custom stage-monitoring mode, providing a more comfortable and secure seal, greater passive isolation, and tuning optimized specifically for live performance.

By retaining the same core monitors across ditterent working modes, musicians can maintain a familiar and dependable monitoring reference wherever their work takes them.

One Earphone - From Studio to Stage - With Consistent Monitoring Accuracy

Four Real-World Challenges of Traditional Custom In-Ear Monitors
For many musicians, custom in-ear monitors are essential tools, combining secure fit, noise isolation, and reliable stage monitoring.

Yet each handcrafted pair is unique and represents a significant investment. From fitting and initial use to rehearsals, recording, and live performance, these four issues are among the most common challenges musicians face with traditional custom in-ear monitors.

1. The Custom Version Sounds Different from the Demo
Musicians will usually audition a universal-fit demo and proceed with a custom order only after they are satisfied with its sound. However, once the finished custom monitor is put into use, it may sound noticeably different from the demo they originally auditioned. This is because the custom earpiece is individually shaped to extend deeper into the ear canal, creating a longer acoustic path for the sound and resulting in a different presentation from the universal-fit version.

2. CIEM Wear and Maintenance After Stage Use
Stage environments are demanding. During performance, CIEMs are exposed for extended periods to sweat, heat, moisture, and frequent insertion and removal. Whether made with soft or hard shells, they require proper cleaning, drying, and care after use. If sweat or moisture remains inside before storage, the next use may reveal reduced volume, left-right imbalance, or noticeable changes in sound.

3. A Comfortable, Secure Seal Keeps Live Monitoring
Uninterrupted In-ear monitors must maintain a secure seal to provide singers and musicians with clear, continuous monitoring throughout a performance. Singing, jaw movement, turning the head, or vigorous movement can change the shape of the ear canal and place pressure on the custom earpiece. If the fit loosens and the seal breaks, monitoring may suddenly be lost, disrupting vocals, playing, or the entire performance.

4. Traditional CIEM Repairs Can Disrupt Professional Schedules
For professional musicians, the greatest concern when a monitor fails is rarely the repair cost—but that rehearsals, recording sessions, and performances cannot wait. Traditional CIEMs often need to be returned overseas for inspection and repair, and the extended turnaround can disrupt upcoming work. A temporary universal replacement may also lack the secure fit, isolation, and familiar monitoring sound of the original custom monitor.

Accurate Monitoring Begins with Proper Fit and Stable Acoustic

1.  21 Adaptive Fit Combinations for Different Ear Canal Diameters and Depths
Most universal-fit earphones rely on different eartip sizes to accommodate different ear canals, yet often overlook the importance of proper insertion depth-the key to achieving a secure and stable fit.

VIORA offers three nozzle lengths, combined with three foam eartips and four silicone eartips, creating 21 adaptive fit combinations. This makes it easier to find the right insertion depth, stability, and seal, while comfortably experiencing VIORA's flat, uncolored, and full-range monitoring sound.

2.  Anatomically Angled, Tapered Nozzle — Engineered to Reduce Pressure
VIORA features a slim neck-and-shoulder profile that allows the earpiece to sit naturally against the concha and ear canal entrance for most users, improving comfort, stability, and seal.
Because the human ear canal does not run straight inward, but follows a natural upward and rearward path, VIORA uses a proprietary compound-angle nozzle design to align more closely with the ear canal. This reduces contact pressure and discomfort while helping the eartip form a more stable acoustic seal at the canal entrance.

3.  ACS LiveSound Filter — Reduces Occlusion & Trapped Volume Insertion Gain (TVIG)
A secure in-ear seal is essential for effective passive isolation and for maintaining stable bass, clear vocals, strong instrumental energy, and a complete soundstage. Yet a highly sealed fit can also create a closed space within the ear canal, leading to pressure build-up (TVIG), a blocked sensation, and discomfort.

ACS's proprietary LiveSound filter structure helps release accumulated pressure and heat from the sealed ear canal while preserving the seal required for accurate monitoring. It also allows ambient sound to enter at a controlled, attenuated level, reducing fatigue during extended wear and delivering a more natural, comfortable monitoring experience.

One Earphone — From Studio to Stage — With Consistent Monitoring Accuracy

1. JANUS Custom Sleeve Upgrade System - From Universal to Custom Stage Mode
In universal monitoring mode, VIORA can be fitted with JANUS custom sleeves in just seconds, transforming it into a dedicated stage-monitoring system.

In its universal configuration, VIORA delivers a flat frequency response with faithful, uncolored monitoring performance, making it ideal for recording, arranging, and rehearsals.

Once fitted with JANUS custom sleeves, VIORA instantly becomes a fully custom in-ear monitor, combining the comfortable, secure fit of soft silicone with monitoring tuning specifically optimized for live stage performance.

2. Dual-Mode Acoustics - Custom-Fit Tuning for Stage Monitoring
Using VIORA itself as the acoustic core, ACS developed a dedicated custom-sleeve structure that minimizes the sound differences commonly introduced when a universal earphone is converted into a custom-fit configuration.

The frequency response of the VIORA + JANUS custom-sleeve mode has also been further optimized to improve vocal and instrumental clarity, maintaining a clear and controlled presentation even in high-volume environments. Output between 6 and 10 kHz is moderately reduced to lessen excessive high-frequency stimulation and the listening fatigue it can cause at elevated monitoring levels.

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