What a Room Sounds Like

How acoustic authorship has moved from backstage correction to founding design intention — and what it demands of the interiors that take it seriously

The most considered spaces in luxury design today are not built around what you see. They are built around what you hear — and, more precisely, around what you will never hear at all.

In February 2026, the annual ISE exhibition in Barcelona — the world’s largest professional AV and systems integration show, which drew nearly 78,000 attendees to its 2025 edition — dedicated a significant share of its residential programming to a question it had rarely posed so directly: how do you design silence? The panels gathered acoustic consultants, high-specification builders, and residential architects in a conversation that had, until recently, belonged to concert halls and recording studios. The premise was disarmingly simple and structurally significant: in the ultra-prime residential market, the acoustic character of a space has become a design decision rather than a byproduct. Sound — its control, its quality, its deliberate absence — is being treated as a material.

The shift is measurable beyond the trade fair circuit. In Miami’s ultra-prime market, across developments from Fisher Island to Bay Harbor Islands, buyers’ specification documents have begun to include acoustic performance criteria alongside the established luxury indicators of ceiling height, floor-plate area, and kitchen specification. The language is borrowed from commercial architecture — reverberation time, sound isolation class, flanking noise — and applied, for the first time, to rooms with no audio-visual purpose in mind: libraries, dining rooms, principal bedrooms, and the kinds of private studies that belong to people whose most demanding work is done in complete stillness. The rooms in question are not home theaters. The question is not how to play music. It is how to live.

THE SIGNAL

For most of its history, acoustic design was a corrective discipline. You built a room; it sounded wrong; you engaged an engineer to mitigate the consequences — panels behind the plasterwork, absorption hidden in the ceiling, mass beneath the floor. The expertise was valued, but it entered the project late, after the fundamental decisions had been made, and its work was invisible by definition: a good acoustic treatment was one you neither saw nor, ideally, noticed.

What is emerging now is something qualitatively different. The acoustic consultancies that established themselves in the performance and broadcast sectors — firms such as Arup’s SoundLab in New York, or the Dallas-based Wrightson, Johnson, Haddon & Williams, whose acoustic systems underpin the MSG Sphere in Las Vegas — are being engaged on luxury residential commissions from concept, not from remediation. Their brief is not to fix what a room sounds like. It is to determine, before a line is drawn, what it should sound like — and to make that decision as foundational as the orientation of the building or the specification of its primary stone.

The reverberation time of a principal bedroom, the decoupling of a library floor from the structural slab, the mass of a party wall between living and sleeping zones: these are now, in the most considered residential projects, architecture. The acoustic envelope is part of the spatial sequence, not an afterthought applied to it.

WHY IT MATTERS

The research case has been building for years. The work of Charles Spence and the Crossmodal Research Laboratory at the University of Oxford has established that sound profoundly conditions how we perceive the warmth, scale, and quality of a space. A room with a reverberation time calibrated for conversation — not dead, not live, but considered — is a room that feels inhabited in a way that its equivalently finished but acoustically unremarked counterpart does not. The sound of footfall on stone, the resonance of a plaster ceiling, the way a kitchen holds ambient noise or disperses it: these register on the body as spatial quality before they register in conscious thought. We call a room “comfortable” and often mean, in part, that it sounds right.

In the hospitality sector, this has been understood at the highest level for some time. The Aman Tokyo’s deliberate attenuation of the city’s noise through mass and material selection, the way a well-designed restaurant divides acoustic zones so that conversation is possible without effort, the profound quiet of a serious hotel corridor: these are designed conditions, not architectural accidents. They represent the accumulated judgment of operators who have learned, over decades, that the acoustic character of a space is as much a part of the guest experience as the quality of its materials or the calibration of its light.

For ultra-prime residential buyers — many of whom move between exceptional hotels, private clubs, and second homes maintained to equivalent standards — the comparison is unavoidable. The home that cannot achieve the acoustic quality of the spaces its owner inhabits professionally, socially, and during travel is a home that is, in the most literal sense, behind.

THE DESIGN ARGUMENT

The distinction between acoustic correction and acoustic authorship is the same distinction that now governs the best thinking in lighting and material design: the difference between resolving a problem and making a decision.

Acoustic authorship asks its questions before the structure is closed. What is the character of this room at rest — the stillness a bedroom should offer at three in the morning, the quality of silence in which a library functions as something more than a storage space for books? What should the kitchen sound like when it is in use, and how should that sound relate to what is happening in the living room beyond? Where should the home be deliberately live — in spaces that benefit from resonance and the gathered warmth of voices — and where should it be deliberately still?

These are not technical parameters. They are spatial intentions, and they carry the same design weight as the decision to use oak or stone, to set a window high or low, to allow a room to run the full depth of a plan or divide it. Peter Zumthor, whose Thermal Baths at Vals remain among the few buildings in contemporary architecture designed with equal rigour for every sense, understood this explicitly: the sound of water moving through those chambers is part of the architectural argument, not incidental to it. Renzo Piano’s work at the Kimbell Art Museum addition and the Whitney Museum in New York holds acoustic consideration with the same seriousness as daylight — because both are the medium through which the art is finally experienced.

In residential architecture, the ambition need not reach these heights. But the discipline should. A home built to a serious standard — one where material, proportion, and light have been chosen through conviction — should apply the same discipline to sound. To do otherwise is to author three of the four conditions of a room and leave the fourth to chance.

EFC Studio

What We Believe About This Moment

At EFC Studio, we have long held that the authored home is defined by the consistency of its attention — the refusal to treat any element of a space as too technical, too peripheral, or too invisible to warrant a considered position. Light, as we have argued before, is a first decision, not a last one. Sound belongs to the same category.

On every commission — a private residence on Fisher Island, a renovation in Madrid, a bespoke hospitality project in the Dominican Republic — we ask what the space should sound like before we ask what it should look like in full specification. Not because acoustic design is a feature to be sold, but because it is a precondition of the kind of experience we are trying to compose. A room that fails acoustically undermines every other decision made in it: the finest stone, the most considered lighting, the most rigorously sourced object will not save a space that is too live, too dead, or too porous to the building around it.

Ella Fontanals Cisneros’ four decades as a collector, patron, and curator of space have made this sensibility part of how EFC Studio approaches architecture at every scale. The gallery that sounds right does not announce itself. The collecting room that holds silence as deliberately as it holds light is doing something that no amount of finish quality or material selection can replicate. Sound is part of the curatorial act — as demanding a discipline in a private residence as in a museum, and as consequential in both.

The luxury market moves, as it does in every domain, from the visible to the considered. The interiors that will endure — that will read as authored rather than assembled a decade from now — are those that held every element, including the ones that cannot be photographed, to the same standard of conviction. Sound is among the last of these to receive the attention it has always deserved. At EFC Studio, it has been part of the brief for some time.

EXECUTIVE SUMMARY

Acoustic design is moving from corrective afterthought to founding design intention in ultra-prime residential development, with specialist firms such as Arup SoundLab and Wrightson, Johnson, Haddon & Williams now engaged at concept stage rather than post-completion.

• Research by Charles Spence and the Crossmodal Research Laboratory at Oxford confirms that acoustic character conditions spatial experience — warmth, intimacy, perceived quality — as profoundly as material selection or light; the hospitality sector understood this first, and residential design is following.

• The distinction between acoustic correction and acoustic authorship mirrors the wider shift in luxury design: the difference between resolving a problem and making a decision with the same weight as stone, aperture, or proportion.

• Architects such as Peter Zumthor and Renzo Piano demonstrate that the most considered buildings design for every sense with equal rigour; the private residence built to a serious standard should hold itself to the same discipline.

• EFC Studio treats acoustic character as a founding question on every commission — alongside light and material — a precondition of the authored interior rather than an upgrade applied to it.