L-Acoustics Soka inWall Delivers Invisible Concert Sound At QUARO Harajuku

Record Bar Resonance Blends Hidden Loudspeaker System With Architectural Design

QUARO, a four-story concept venue on Cat Street in Harajuku, Tokyo, has deployed Japan’s first L-Acoustics Soka inWall system to power its second-floor record bar, Resonance. The installation delivers concert-grade sound while keeping loudspeakers fully hidden inside the walls, preserving the minimalist interior conceived by SUPPOSE DESIGN OFFICE.

Opened in February 2026, QUARO is structured around a theme of filtration, with each floor representing a different experiential stage. Alchemy offers a private, tailored coffee course focused on the transformation of green coffee beans. Flow provides a casual, street-connected coffee and pastry experience. Resonance centers on music-led relaxation, and Edition serves as a creative floor for collaborations with art and brands.

Resonance is the most audio-focused floor, shifting from vinyl-curated background music by day to full DJ sets after dark. It is also the only floor running a discreet, performance-grade L-Acoustics solution, designed to be sonically powerful yet visually absent.

Venue Concept Puts Every Surface Under Design Scrutiny

SUPPOSE DESIGN OFFICE approached Resonance as a sensory-awakening environment that engages guests through light and shadow, material texture, subtle scent, and sound. The clean architectural lines left no obvious room for traditional loudspeaker placement, and exposed brackets or visible speaker boxes would have compromised the carefully balanced visual composition.

The brief called for a record bar that could host a credible DJ performance while appearing unchanged from the architects’ drawings. This eliminated the typical solution of hanging large loudspeakers, creating a challenge for the project team to deliver club-capable output without any visible hardware.

To meet this requirement, QUARO turned to Nippon Rediffusion for acoustic design and system integration, working in partnership with L-Acoustics Certified Provider Bestec Audio.

Audio Requirement Demands Concert Capability With No Visible Hardware

According to Nippon Rediffusion audio systems designer Hiromu Itoh, the project hinged on balancing two opposing demands: the need for high-output, high-fidelity sound suitable for DJ sets, and the requirement that the sound system remain completely out of sight to protect the room’s refined aesthetic.

Music bars traditionally rely on prominent, large-format loudspeakers to deliver the needed output. At Resonance, that option was ruled out from the outset. The team needed a solution that could match concert-grade performance while disappearing into the architecture.

L-Acoustics Soka inWall was selected specifically for this challenge. The colinear source is engineered to be recessed into standard wall construction, providing line source performance from a completely flush surface with no visible loudspeaker cabinetry.

Soka inWall Installation Becomes First Of Its Kind In Japan

Bestec Audio reports that the Resonance installation is the first deployment of Soka inWall in Japan. Itoh notes that the product was uniquely suited to the brief, citing its ability to rival traditional concert systems in both power and sound quality while remaining entirely embedded in the wall.

The system design allows the same concealed infrastructure to support both daytime coffee service soundscapes and evening DJ sets, aligning with QUARO’s aim to transform the space’s atmosphere across the day without altering its visual character.

Soundvision Modeling Aligns Loudspeaker Placement With Architectural Drawing

Placement of the Soka inWall enclosures was determined through close collaboration between SUPPOSE DESIGN OFFICE and the audio team. Spatial designer Kagetsu Sen provided architectural drawings that Itoh imported into L-Acoustics Soundvision, the manufacturer’s 3D acoustical simulation software.

Within Soundvision, Itoh evaluated multiple candidate positions, mapping coverage and sound pressure levels across key listener areas including the counter, elevator entrance, and window seating. This process ensured that acoustic performance requirements were met without disrupting architectural intent.

The final positions that delivered optimal coverage and level in the simulation aligned with locations the design team could maintain visually, allowing the acoustic and architectural plans to converge without compromise.

Soka inWall System Design Supports Deep Narrow Floor Plan

The Resonance floor runs on two L-Acoustics Soka inWall loudspeakers. One unit is recessed behind the staff counter, while the second sits near the elevator entrance. An L-Acoustics SB10r inWall subwoofer is installed below the second enclosure to extend low frequency response down to 25 Hz.

Soka inWall operates full range, with the SB10r adding low-end weight, particularly for evening DJ sessions. The system is tuned to serve both relaxed daytime playlists and more energetic nighttime performances from the same infrastructure.

Soka inWall provides 140-degree horizontal directivity with vertical coverage controlled to 26 degrees. This pattern is well-matched to Resonance’s deep, narrow floor plan, allowing two loudspeakers to cover the full room width while limiting unwanted reflections from the ceiling and large glass surfaces. The result is focused energy on listeners and consistent coverage across multiple seating zones.

Guest Experience Evolves From Coffee Service To Nighttime Performance

The integrated system is designed to support QUARO’s broader concept of spaces that evolve through the day. On the Resonance floor, the invisible loudspeaker infrastructure underpins that transformation, shifting from background ambience to performance-level sound without any visible change in the room.

QUARO’s management emphasizes that the second floor is intended as a place where guests can linger over both coffee and music. The transition at sunset, as the DJ booth takes over and the sound becomes the primary focus while the system itself remains hidden, embodies the venue’s commitment to elegance and sensory detail.

With the first Soka inWall deployment in Japan, Nippon Rediffusion and Bestec Audio have demonstrated how architectural priorities and high-end sound reinforcement can coexist in premium hospitality environments, offering a blueprint for record bars, cafes, and hybrid venues seeking performance-grade audio without visible hardware.