Shibuya Hybrid.

The Dual-Purpose Dilemma

Two-channel stereo and multi-channel home cinema have contradictory acoustic requirements. A pure stereo room often benefits from some liveness and specific diffusion patterns to enhance the sense of space. A cinema room, particularly for Dolby Atmos, requires a much "deader" environment to allow the precise spatial placement of effects by the surround speakers. The client wanted both in one dedicated subterranean room in Shibuya.

Architectural Acoustic Integration

We built the room from the concrete shell up. To achieve the required isolation (preventing bass from disturbing the rest of the house), we employed a fully decoupled "room-within-a-room" construction, floating the floor on neoprene isolators.

Variable Acoustics

To solve the stereo vs. cinema dilemma, we implemented variable acoustics:

• Hybrid Front Wall

  The front wall utilizes deep broadband absorption to tighten cinema dialogue, but is clad in visually continuous vertical wood slats. The spacing of the slats is pseudo-randomized to provide high-frequency diffusion for the stereo mains.

• Hidden Surround Array

  To maintain a clean aesthetic for music listening, all 9 surround and Atmos height channels are concealed behind acoustically transparent fabric walls, stretching seamlessly around the perimeter.

• Bypass Signal Path

  We designed the electronics rack with an analog bypass relay. For stereo listening, the AV processor is entirely removed from the signal path, routing the high-end DAC directly to the dual-mono amplifiers driving the reference mains.

The Result

The space is an acoustic chameleon. Put on a jazz record, and the room feels spacious, airy, and deeply musical, with a soundstage that extends far beyond the walls. Dim the lights and start a film, and the room sonically vanishes, replacing reality with the immersive, pinpoint accuracy of a dubbing stage.