Acoustic Environment Optimization

Why do we address Environment before Equipment in designing Microsoft Teams Rooms (MTRs) - and in all meeting and teaching spaces? The fundamental principle of the EASE methodology starts with Environment because room acoustics determine your audio system quality - and not the other way around. So let’s consider Audio - the most important element in hybrid spaces. DSP is great and now essential but it cannot sidestep the laws of physics. The physics are unforgiving: DSP improvements are limited by what the microphone captures initially. Although inconvenient for the aesthetics, a gooseneck microphone positioned 30cm from a speaker’s mouth will outperform ceiling-mounted beamforming arrays with their sophisticated processing, purely because of signal-to-noise ratio advantages. Why does this matter? AVIXA’s task group for our dynamic range standard notes that system noise floor must minimally increase ambient room noise, and maximum linear SPL must meet target levels. Poor room acoustics make both requirements exponentially harder to achieve regardless of processing power. RT60 measurements tell the story: rooms with reverberation times above 0.6 seconds require increasingly complex DSP solutions to achieve the same speech intelligibility that rooms with 0.4-0.5 second RT60 deliver naturally. EASE: Environment, Audio, Screens, Equity. The methodology that makes hybrid workspace design systematic instead of accidental. GJC's methodology for optimal meeting and teaching space design. The EASE methodology principle: Optimize the acoustic foundation first, then specify technology to enhance that foundation rather than fight it. To learn more, please message me or see the link to Greg Jeffreys Consulting Ltd in the Comments section below. This approach facilities: clearer audio with simpler systems; lower complexity and maintenance requirements; better user experiences at lower total cost; future-proof (or resistant!) designs that work with any platform. Room acoustics are your audio system's foundation. Get the foundation right, and everything else becomes easier. What environmental factors do you prioritise before technology specification? #microsoftteamsrooms #avtweeps #EASEmethodology #hybridmeetings #avusergroup #ltsmg #schoms  #avixa

The irony of modern workplaces is that  We removed walls to improve collaboration  And ended up destroying concentration… ‘Open plan offices need acoustics’ Period!! I visit a lot of offices.  The pattern is consistent + Beautiful open plan  + Ergonomic furniture  + Natural light everywhere  + Plants and all the Instagram-worthy elements YET … everyone wearing headphones  Desperately trying to create the walls we removed Open plan offices aren't the problem.  Acoustically naive open plan offices are. Last month,  We completed a retrofit for a tech company in Pune, 200-person workspace. Productivity had dropped 18% after their office was redesigned.  They had blamed "adjustment period."  Their people blamed noise. Exit interviews told the real story: "Can't concentrate." "Overhear ten conversations while trying to focus." "Every phone call disrupts my whole team." The fix wasn't walling,  it was acoustic zoning → Suspended baffles over collaboration areas (absorb noise at source) → Acoustic rafts over focus zones (create quiet pockets) → Modular floor-to-ceiling panels between teams (visual openness, acoustic separation) → Ceiling clouds with targeted absorption coefficients (frequency-specific control) Now, three months post-installation, productivity recovered to pre-redesign levels.  The open plan stayed.  The noise left. Here's what architects often miss  Acoustic design isn't about making everything quiet.  It's about controlling where sound goes. → Collaboration zones should support conversation without broadcasting it.  → Focus zones should isolate concentration work.  → Phone booths should contain calls. Each needs different acoustic treatments. The modern workplace needs acoustic systems, not acoustic afterthoughts. We spent decades perfecting daylighting, ergonomics, and biophilia.  Time to give noise the same strategic attention. Your office might look amazing.  But does it sound amazing?

𝐖𝐞𝐞𝐤 3 – 𝐀𝐮𝐝𝐢𝐨 𝐃𝐞𝐬𝐢𝐠𝐧 𝐟𝐨𝐫 𝐒𝐞𝐦𝐢𝐧𝐚𝐫 𝐑𝐨𝐨𝐦𝐬 🎓 Seminar rooms must support 𝐩𝐫𝐞𝐬𝐞𝐧𝐭𝐚𝐭𝐢𝐨𝐧𝐬, 𝐝𝐢𝐬𝐜𝐮𝐬𝐬𝐢𝐨𝐧𝐬, 𝐚𝐧𝐝 𝐚𝐮𝐝𝐢𝐞𝐧𝐜𝐞 𝐢𝐧𝐭𝐞𝐫𝐚𝐜𝐭𝐢𝐨𝐧. 𝐊𝐞𝐲 𝐝𝐞𝐬𝐢𝐠𝐧 𝐞𝐥𝐞𝐦𝐞𝐧𝐭𝐬 𝐢𝐧𝐜𝐥𝐮𝐝𝐞: • Balanced sound coverage across seating areas • Wireless microphones for presenters and audience questions • Proper loudspeaker placement to avoid feedback • Integration with recording and presentation systems • Acoustic optimisation for better speech clarity 𝐀𝐥𝐬𝐨 𝐫𝐞𝐟𝐞𝐫: 1) 𝐌𝐢𝐜𝐫𝐨𝐩𝐡𝐨𝐧𝐞 𝐬𝐭𝐫𝐚𝐭𝐞𝐠𝐲 (𝐦𝐨𝐬𝐭 𝐜𝐨𝐦𝐦𝐨𝐧 𝐩𝐚𝐢𝐧 𝐩𝐨𝐢𝐧𝐭): + Presenter mic: lavalier or headset (headset = best clarity/least feedback). + Backup/handheld: always have one ready for Q&A or if a lav fails. + Audience Q&A options: Pass-around handheld + Ceiling array mics (clean look, great for hybrid, needs tuning & good acoustics) + Table boundary mics (works for fixed layouts, can pick up paper noise) 2) 𝐋𝐨𝐮𝐝𝐬𝐩𝐞𝐚𝐤𝐞𝐫 𝐚𝐩𝐩𝐫𝐨𝐚𝐜𝐡: + Prefer distributed speakers for even coverage vs one loud source. + Keep speakers in front of microphones where possible. + Aim for high intelligibility over “loudness” (speech first, not music PA). 3) 𝐃𝐒𝐏 + 𝐩𝐫𝐨𝐜𝐞𝐬𝐬𝐢𝐧𝐠 (𝐰𝐡𝐞𝐫𝐞 𝐪𝐮𝐚𝐥𝐢𝐭𝐲 𝐢𝐬 𝐰𝐨𝐧/𝐥𝐨𝐬𝐭): + Automatic mixing (gates unused mics to reduce noise/echo). + AEC (echo cancellation) for video calls (Teams/Zoom) is essential. + EQ and dynamics tuned for speech (avoid boomy low end). + Feedback suppression only as a last layer—not the core solution. 4) 𝐑𝐨𝐨𝐦 𝐚𝐜𝐨𝐮𝐬𝐭𝐢𝐜𝐬 (𝐨𝐟𝐭𝐞𝐧 𝐢𝐠𝐧𝐨𝐫𝐞𝐝): + Watch for reverberation from glass, concrete, high ceilings. + Add acoustic panels / treatment to improve intelligibility. + HVAC noise matters: high background noise forces louder systems and reduces clarity. 5) 𝐇𝐲𝐛𝐫𝐢𝐝 𝐭𝐞𝐚𝐜𝐡𝐢𝐧𝐠 / 𝐫𝐞𝐜𝐨𝐫𝐝𝐢𝐧𝐠 𝐫𝐞𝐪𝐮𝐢𝐫𝐞𝐦𝐞𝐧𝐭𝐬: + Decide early: in-room reinforcement only vs reinforcement + capture. + For recording, prioritize direct mic feeds over “room mic” sound. + Consider mix-minus routing so far-end audio doesn’t feed back into itself. 6) 𝐂𝐨𝐧𝐭𝐫𝐨𝐥 & 𝐮𝐬𝐚𝐛𝐢𝐥𝐢𝐭𝐲 (𝐤𝐞𝐞𝐩𝐬 𝐬𝐲𝐬𝐭𝐞𝐦𝐬 𝐚𝐜𝐭𝐮𝐚𝐥𝐥𝐲 𝐮𝐬𝐞𝐝): + Simple preset-based UI: “Lecture / Discussion / Hybrid Call” + Clear mic storage/charging plan (and spares). + “One button to start” workflow for non-technical users. 7) 𝐂𝐨𝐦𝐦𝐢𝐬𝐬𝐢𝐨𝐧𝐢𝐧𝐠 & 𝐯𝐞𝐫𝐢𝐟𝐢𝐜𝐚𝐭𝐢𝐨𝐧 (𝐭𝐡𝐞 𝐩𝐫𝐨𝐟𝐞𝐬𝐬𝐢𝐨𝐧𝐚𝐥 𝐝𝐢𝐟𝐟𝐞𝐫𝐞𝐧𝐭𝐢𝐚𝐭𝐨𝐫): + Measure and document: SPL, STI/ALCons, noise floor. + Do a real walk test with speech, not just pink noise. + Train users + leave quick-start guides. The objective is simple: 𝐞𝐯𝐞𝐫𝐲 𝐩𝐚𝐫𝐭𝐢𝐜𝐢𝐩𝐚𝐧𝐭 𝐬𝐡𝐨𝐮𝐥𝐝 𝐡𝐞𝐚𝐫 𝐭𝐡𝐞 𝐩𝐫𝐞𝐬𝐞𝐧𝐭𝐞𝐫 𝐜𝐥𝐞𝐚𝐫𝐥𝐲 𝐟𝐫𝐨𝐦 𝐚𝐧𝐲 𝐬𝐞𝐚𝐭. "𝑮𝒐𝒐𝒅 𝒂𝒖𝒅𝒊𝒐 𝒅𝒆𝒔𝒊𝒈𝒏 𝒊𝒔 𝒏𝒐𝒕 𝒂𝒃𝒐𝒖𝒕 𝒍𝒐𝒖𝒅 𝒔𝒐𝒖𝒏𝒅 — 𝒊𝒕 𝒊𝒔 𝒂𝒃𝒐𝒖𝒕 𝒄𝒍𝒂𝒓𝒊𝒕𝒚, 𝒄𝒐𝒗𝒆𝒓𝒂𝒈𝒆, 𝒂𝒏𝒅 𝒂𝒖𝒅𝒊𝒆𝒏𝒄𝒆 𝒆𝒙𝒑𝒆𝒓𝒊𝒆𝒏𝒄𝒆."

Thrilled to announce that our latest paper, "Universal acoustic design for schools: An evidence based approach," is published today in Applied Acoustics! Did you know that in an average UK primary classroom, up to 8 children may have temporary or permanent special hearing and communication needs (SHCN)? For these students - and many others, including young learners and those with English as an additional language - typical classroom noise is a significant barrier to learning. Good acoustics shouldn't be an afterthought or a specialist provision; they are fundamental to creating truly inclusive environments. Emma Greenland has led this work since 2018,, along with myself, Adrian James, and Professor Emerita Bridget Shield; this work addresses a critical issue: the acoustic environment of our mainstream school classrooms needed to support the actual range of learning needs present in British classrooms today. In this paper, we propose a universal acoustic design framework for mainstream schools. Our key findings include: 🔹The Scale of the Need: 8% of pupils in England and Wales have SHCN, and a further 3% have social, emotional, and mental health needs which are negatively affected by poor acoustics. This means every classroom needs to be designed with #AuralDiversity in mind. 🔹An Evidence-Based Standard: Based on extensive analysis, we propose "reasonably adjusted" criteria for mainstream classrooms of 0.5s reverberation time and 35 dBA ambient noise level, for all age groups in all ventilation conditions. This solution is achievable in practice accounting for latest classroom design trends and other design constraints. 🔹Proven Benefits: Adopting these standards helps control the buildup of occupancy noise during lessons, which is known to detrimentally affect learning and academic performance. Teacher interviews conducted by Audiologist Karen Wright confirm that improved acoustics lead to calmer environments, better focus, increased peer interaction, and reduced vocal strain. 🔹A Holistic Approach: The most effective solution combines good acoustic design with assistive technologies and classroom management strategies to support every student. Creating learning environments where every child can thrive is a challenge we can meet with evidence-based design. Free access with this link for the full paper here: https://lnkd.in/e7ypX8yh We welcome your thoughts and discussion in the comments. #Acoustics #InclusiveDesign #UniversalDesign #SchoolDesign #LearningEnvironments #Education #SEND #ArchitecturalAcoustics #EvidenceBasedDesign #ClassroomAcoustics

Designing for Sound: Integrating Acoustic Performance into Architectural Planning Acoustics is a fundamental yet frequently underestimated dimension of architectural design. While visual aesthetics and spatial composition often dominate early planning, the way a space manages sound profoundly affects its functionality, comfort, and psychological impact. Understanding and applying key acoustic parameters — most notably the Noise Reduction Coefficient (NRC)—enables designers to create environments that support clarity, focus, and wellbeing.   Understanding NRC in Design Context The Noise Reduction Coefficient (NRC) quantifies how much sound a surface absorbs. Expressed as a value between 0.00 and 1.00, lower readings (e.g., 0.20) reflect sound, amplifying echoes, while higher readings (e.g., 0.80) absorb sound, reducing reverberation and improving speech intelligibility. Materials such as dense concrete or glass have low NRC values, whereas mineral wool panels, acoustic ceiling tiles, or fabric-covered absorbers offer significantly higher acoustic performance.   Material Selection and Spatial Planning However, achieving optimal sound comfort extends beyond selecting high-NRC materials. The distribution, orientation, and geometry of surfaces strongly influence how sound behaves within a room. Combining absorptive and diffusive materials ensures balanced acoustic conditions — absorbing excessive reflections while maintaining a sense of liveliness. For example, integrating acoustic ceilings over collaborative zones, wall panels near reflective surfaces, and diffusers in performance spaces can collectively create a harmonized sound environment.   Human Comfort and Functionality Acoustic design directly impacts productivity and wellbeing. In offices, controlled reverberation improves speech privacy and concentration. In educational and healthcare settings, reduced background noise enhances comprehension and recovery. Designing for auditory comfort is therefore not a luxury — it is a functional necessity and a criterion for sustainable architecture.   Sound as a Design Layer When treated as a parallel design layer alongside lighting, ventilation, and material composition, acoustics transforms from a corrective measure to a proactive design tool. The result is architecture that sounds as good as it looks—spaces that foster communication, comfort, and clarity through intelligent, performance-driven design. #AcousticDesign #ArchitecturalEngineering #BuildingPerformance #InteriorArchitecture #SustainableDesign #WorkplaceWellbeing #SoundDesign #HumanCenteredDesign