Why Classroom Is Too Loud And What Schools Can Actually Do?

It usually starts with a staff meeting comment. A teacher mentions they’re losing their voice by 2pm. Then another says the same. A parent emails to ask why their child keeps coming home saying they couldn’t hear the teacher. A relief teacher writes it on their feedback form: “Room 4 is extremely loud – hard to manage.” The problem is real, it’s consistent, and it keeps coming back. But when you walk into those classrooms, nothing looks wrong. There’s no obvious source of noise. The students aren’t any louder than normal. The room looks fine.

Here’s everything you need to understand – and decide.

• 1 in 4 Words missed by students in untreated classrooms, per Australian acoustic research
• 1.4s Typical reverberation time in an older Melbourne school classroom (target: ≤0.6s)
• 60% Of teachers experience voice problems during their career, often linked to poor room acoustics

The Problem Has a Name: Reverberation

Most people associate a “loud” classroom with students. But the classrooms where teachers consistently struggle – where voices give out, where students at the back disengage, where noise seems to build no matter what’s happening – almost always have the same underlying cause: reverberation.

Reverberation is what happens when sound reflects off hard surfaces and lingers in a space. A bare plaster wall, a concrete ceiling, a polished timber floor, a glass window – each of these bounces sound back into the room rather than absorbing it. In a typical older school building, a teacher’s words can take between 1.0 and 1.8 seconds to fully decay after they stop speaking.

That might seem insignificant. In practice, it means that every syllable a teacher speaks is overlapping with the reflected echo of the syllable before it. By the time speech reaches the back of a 30-seat classroom, it’s acoustically muddied. Students aren’t failing to listen – they’re physically unable to distinguish the words clearly.

The technical measure of how well speech travels through a room is called the Speech Transmission Index (STI). A well-treated classroom should score above 0.60 on the STI scale. Untreated classrooms in older buildings commonly measure between 0.35 and 0.45 – a range where speech intelligibility is considered “poor” to “fair” by international acoustic standards.

This isn’t a behaviour problem or a staffing problem. It’s a physics problem. And physics problems have engineering solutions.

→ See how this looks in practice:SoundFix school acoustic treatment case studies — before and after reverberation data →

What Teachers Actually Experience – And Why It Matters for Retention

Teacher vocal fatigue is not a minor inconvenience. It is one of the most underreported occupational health issues in Australian schools, and its connection to classroom acoustics is consistently underestimated. In a reverberant room, teachers do not simply speak louder. Their bodies automatically compensate: they project harder, change pitch, slow their pace, and repeat themselves more frequently. This compensatory behaviour is largely unconscious – but over a five-hour teaching day, the cumulative strain on the vocal mechanism is significant. Voice fatigue leads to hoarseness, loss of range, and – in recurring cases – to chronic vocal pathology including vocal nodules.

Beyond vocal strain, teachers in high-reverberation rooms report higher levels of cognitive fatigue, difficulty monitoring the whole class simultaneously, and reduced confidence in whether students are genuinely following their instruction. The experience is often described as “teaching into noise” – expending significant energy for uncertain returns.

For school leaders, this has direct implications for staff wellbeing, sick leave patterns, and teacher retention. When the room itself is the problem, addressing the room is one of the most practical wellbeing interventions available – and unlike most wellbeing initiatives, its effect is immediate and measurable.

“After the treatment was installed, our Year 3 teacher told me she’d had her first full day of teaching without losing her voice in three years. She thought it was just part of the job. It wasn’t — it was the room.”

— Primary school principal, Melbourne inner east

How Melbourne and Sydney School Buildings Became Acoustically Problematic

Most Australian school buildings were designed and constructed before acoustic performance for learning spaces was a serious design consideration. Buildings from the 1950s through to the early 2000s were typically built with hard, durable, easy-to-clean materials – concrete, brick, plasterboard, vinyl, and glass. These materials were practical and cost-effective. They are also acoustically reflective.

Modern classroom pedagogy has made things harder, not easier. Where classrooms once operated in relative quiet – rows of students, single teacher, minimal group activity – contemporary teaching involves group work, movement, collaborative tasks, and open-plan configurations. The noise profile of a modern classroom is significantly higher than that of its predecessor. The buildings simply weren’t designed for it.

In Melbourne and Sydney specifically, the age profile of school buildings means that a large proportion of classrooms – particularly in government primary schools, Catholic parish schools, and older independent schools – operate in spaces with reverberation times two to three times above the recommended level. It’s not a design failure anyone is to blame for. It’s a mismatch between how buildings were built and how they’re now used – and it’s correctable.

What the Australian Standards and State Guidelines Actually Say

This is where many schools are surprised to learn how clearly the regulatory landscape addresses acoustic quality in learning environments.

Australian Standard AS/NZS 2107:2016 specifies recommended reverberation time targets for educational spaces. For primary school classrooms, the recommended RT is 0.4–0.6 seconds. For secondary classrooms, 0.6–0.8 seconds. For early learning and childcare rooms, 0.4–0.6 seconds. These are not aspirational guidelines – they are referenced in building codes for new and significantly refurbished educational buildings.

In NSW, the Department of Education’s School Design Standards explicitly reference reverberation time and speech intelligibility as design requirements. Schools undertaking capital works are expected to demonstrate acoustic compliance.

In Victoria, the early childhood building guidelines state that children and educators must be able to speak and be heard without strain – a requirement that has direct implications for acoustic treatment in childcare and early learning settings.

Most existing school buildings – particularly those built before 2005 – do not meet these targets. For school leaders considering an acoustic upgrade, the compliance context provides a legitimate rationale for facilities spend that goes beyond comfort or preference.

→ Childcare and early learning centres: How SoundFix helps childcare centres meet Victoria and NSW acoustic guidance →

What Acoustic Treatment Actually Involves – A Plain-English Explanation

There is persistent confusion between acoustic treatment and soundproofing. They are different things. Soundproofing prevents sound from travelling between rooms – through walls, floors, and ceilings. It typically requires significant structural work and is expensive to retrofit.

Acoustic treatment improves the sound quality within a room by reducing reverberation. It does not prevent sound from entering or leaving – it controls how sound behaves once it’s inside the space. This is what classrooms need, and it is what acoustic panels, ceiling baffles, and suspended acoustic clouds do.

When sound-absorbing panels are installed on walls and ceilings, they convert reflected sound energy into heat through friction within the panel material – typically recycled polyester fibre, glasswool, or acoustic foam wrapped in fabric. The reflected sound that would otherwise bounce around the room is instead absorbed before it can accumulate. Reverberation time drops. Speech becomes clearer. The room feels quieter even when the same number of people are speaking.

The key variables that determine how much treatment a room needs are:

• Room volume (length × width × height in cubic metres)
• The acoustic absorption coefficient of existing surfaces (carpet absorbs; concrete reflects)
• The current measured or estimated RT
• The target RT for the room type

A proper acoustic assessment calculates these variables and recommends the right amount and placement of treatment. Installing panels without this calculation is guesswork — and it explains why many schools have panels that “didn’t seem to make much difference.” It’s not that acoustic panels don’t work. It’s that the wrong amount was installed in the wrong places.

→ Learn more:SoundFix classroom acoustics service – what a full assessment and treatment involves →

The School Holiday Install: How Most Melbourne and Sydney Schools Get This Done

The most common objection school leaders raise when considering acoustic treatment is disruption. Installing anything in a functioning school feels complicated — rooms are occupied, students are present, routines are tight.

In practice, classroom acoustic treatment is one of the least disruptive upgrades a school can undertake.

A standard classroom takes between half a day and a full day to treat, depending on the number of panels and whether ceiling baffles are included. SoundFix schedules the majority of school installations during school holiday periods April, July and September/October windows — so that rooms are completed and ready before students return. There is no requirement to relocate classes, no noise or dust during the school day, and no interruption to the teaching programme.

For schools treating multiple rooms, installations are staged across the holiday period or sequenced across multiple holiday windows — starting with the worst-performing rooms and building from there.

The other practical advantage of holiday installations: the before-and-after difference is experienced immediately on the first day of term. Teachers walk in, notice it, and the feedback loop is instant.

What to Expect from a SoundFix Acoustic Assessment

Every project starts with a free on-site acoustic assessment. Here’s what that involves:

1. Site visit — A SoundFix Acoustic specialist visits your school and assesses 1–3 rooms. The visit typically takes 45–90 minutes.
2. Room evaluation — We assess surface materials, room dimensions, and current acoustic conditions. Where possible, we take reverberation measurements.
3. Written report — Within two business days, we provide a written Acoustic Improvement Report covering: what’s happening in the room, what treatment we recommend, and 2–3 budget options at different improvement levels.
4. No obligation — The assessment and report are provided at no cost. You decide whether to proceed, at your own timeline.

Most school leaders who receive the report find it useful regardless of whether they proceed immediately — it gives them a documented basis for a board or P&C conversation about facilities spend, and a scope that can be presented for budget approval.

Frequently Asked Questions

Ready to Find Out What’s Happening in Your Classrooms?

SoundFix Acoustics offers free on-site acoustic assessments for schools, early learning centres, and community education spaces across Melbourne and Sydney.

No cost. No obligation. A practical, expert assessment of your rooms — and a written report with clear options.

→ Book your free acoustic assessment

Or call us directly: 1800 330 927 — we respond the same business day.

Related Reading

• Acoustic panels in classrooms — what they are and how they work
• Noise control in childcares, kindergartens and learning centres
• Government grants for acoustic panel installation in Victorian schools and kindergartens
• Healthy learning environments — acoustic solutions for schools
• Case studies — school acoustic treatment in Melbourne and Sydney

What are acoustic panels?

They are panels made of sound-absorbing materials (often foam, polyester fiber, fabric-wrapped insulation or wood composites) that you mount on walls or ceilings. Their porous structure traps and dissipates sound energy. Instead of the sound wave hitting a flat plaster wall and reflecting, it hits the soft panel and gets absorbed – no more echo from that surface. Acoustic panels come in various sizes and designs, so they can blend into your decor or even enhance it. Businesses are increasingly turning to such panels to solve echo issues; for instance, modern offices install sound-absorbing panels to create quieter, more productive workspaces. These panels don’t block sound from leaving the room (that’s a different issue of soundproofing between rooms), but they significantly reduce the noise levels and echo within the room by preventing reflections.

Acoustic Wall Panels

Wall-mounted acoustic panels are one of the most common solutions to echo. By placing panels on the walls around a room, you address the reflections that occur at the vertical surfaces. Wall panels absorb the sound waves that hit them, instead of letting those waves reflect back and forth across the room. This makes a huge difference in clarity – in spaces like conference rooms or classrooms, treating the walls means voices don’t keep bouncing around, so speech stays intelligible. Our own SoundFix Acoustic Wall Panels are designed exactly for this purpose: they dampen noise to make speech and music clearer.

When using wall panels, you’d usually distribute them around the room’s perimeter. It’s often wise to focus on the areas at ear level – that’s where a lot of direct sound travels during conversation or while listening to a presentation. By catching those sound waves at ear level, wall panels prevent strong echoes that would otherwise muddy the sound. For instance, in a boardroom with severe echo, mounting panels on the side walls where people face each other will absorb the first reflections of speech. In a school classroom, placing panels on the back wall and side walls can greatly improve how well students hear the teacher by reducing echo. Wall panels have the advantage of being relatively easy to install (compared to ceiling treatments) and easy to access if you need to remove or reconfigure them. However, keep in mind that wall panels alone may not cure a very echoey space with high ceilings – they cover less surface area than a ceiling and might leave some echoes untreated in cavernous rooms. In many cases, a combination of wall and ceiling panels yields the best results.

Acoustic Ceiling Panels

Ceiling panels are another powerful tool for echo reduction, especially in large or open areas. Acoustic ceiling panels can be attached directly to the ceiling or suspended a few inches below it (as hanging “clouds” or baffles). Because ceilings often represent a big unobstructed surface, treating it can absorb a lot of sound that would otherwise bounce down into the room. This is particularly useful in venues with high ceilings, like open-plan offices, restaurants, halls, or yoga studios. In fact, if you have a tall, reflective ceiling, ceiling-mounted acoustic treatments will usually yield more impact on echo than wall panels at floor level. The panels essentially trap sound waves up above before they can reflect back to the floor, significantly cutting down the overall reverberation.

At SoundFix Acoustics, we often install ceiling panels for places like busy cafes or open offices where a lot of noise rises upward – by treating the ceiling, we prevent those sounds from bouncing back into the chatter below. For example, installing our foam acoustic ceiling panels in a bustling restaurant can bring down the echo and make conversations much more comfortable. Ceiling acoustic panels can be quite discreet; white or paintable panels blend into a white ceiling, or you can use designer acoustic baffles that add an architectural element. One key advantage is the large coverage – you can cover a broad area overhead without interfering with wall space or furniture layout. Do note that ceiling panels might be a bit more involved to install (usually a professional should do it, especially if suspending panels), and very often the best approach is to use both ceiling and wall panels together for comprehensive echo control. By doing so, you absorb sound both where it travels horizontally and vertically, tackling echo from all directions.

(For a deeper comparison of ceiling vs wall acoustic panels, see our article on Acoustic Panels on Ceilings vs Walls which explains which situations call for which panel type.)

Acoustic Treatments (Baffles, Bass Traps, etc.)

Beyond standard flat panels, there are other acoustic elements you might consider adding depending on your space’s needs:

Hanging Baffles : These are a type of acoustic panel hung vertically from the ceiling (baffles) or horizontally suspended. They are highly effective in large open areas like auditoriums, open-plan offices, or gyms with very high roofs, where wall space is limited. Baffles present two sides to absorb sound and can be arranged in clusters to soak up echo in big volumes of space. They also add a visual design element overhead. If your business space has an industrial-chic look with exposed ceilings, acoustic baffle panels can be installed between beams to cut down the echo without altering the vibe. SoundFix Acoustics offers acoustic baffles designed for high-ceiling areas that blend functionality with aesthetics.

Acoustic Foam Panels: These are lightweight foam tiles that can be mounted on walls or ceilings. For a business, foam panels are a low-cost way to reduce echo in small areas. However, professional acoustic panels generally perform better and look nicer in client-facing spaces.

Bass Traps: If your echo problem includes a boomy sound (low-frequency reverberation), you might need thicker corner acoustic panels, known as bass traps. These are usually placed in the corners of a room to absorb lower frequencies that standard panels might not fully catch. Bass traps are more relevant in music rooms, auditoriums or places with subwoofer noise; most typical offices or restaurants don’t need dedicated bass traps unless there’s a specific low-frequency issue.

In general, adding any of these acoustic treatments will increase the sound absorption in your business space and reduce the echo. The choice depends on your specific noise issues, budget and aesthetic preferences. Many businesses consult with an acoustic professional to determine the right mix of wall panels, ceiling panels and other solutions for maximum effect. Our team at SoundFix Acoustics, for instance, will assess a space and often recommend a tailored combination – say, a certain percentage of ceiling coverage plus panels on two walls – to meet desired acoustic goals.

Classrooms & Educational Spaces:

Schools and training facilities typically have big echo problems due to large rooms, high ceilings, and lots of hard furniture. Unfortunately, excessive echo in classrooms makes it hard for students to hear the teacher, leading to lower comprehension and more distractions. Reducing echo is crucial for learning – research shows that improving classroom acoustics can significantly boost student engagement and even test scores. So what can you add to a classroom to reduce echo? Traditional fixes include putting tennis balls on chair legs (to reduce scraping noises and slightly dampen vibrations) and laying down mats or carpet in reading areas. Many schools add fabric curtains on windows or even along walls to serve as occasional dividers (doubling as acoustic absorbers). However, the most effective solution in a classroom or lecture hall is to install acoustic panels.

For example, placing a series of acoustic panels on the back wall of the classroom (where the teacher’s voice would otherwise reflect back at the students) can greatly improve speech intelligibility. Panels on the ceiling or as acoustic baffles in a cafeteria or gymnasium will tackle the excessive echo in those large spaces. We at SoundFix Acoustics have worked with many Victorian schools to improve their acoustics; typically we use polyester acoustic panels on walls or ceilings, which immediately make the room sound clearer. Teachers no longer have to shout and students don’t struggle to listen. One kindergarten that installed acoustic panels saw improved concentration for students and better voice projection for teachers. Additionally, a quieter classroom is more inclusive – it especially helps those with hearing difficulties or learning needs who struggle in echoey rooms. For a deep dive into this topic, check out our article on Acoustic Panels in Classrooms which explains how good acoustics support better learning outcomes.

 

What Can I Do to Reduce Echo?

When it comes to reducing echo in commercial spaces, success isn’t just about buying the right panels — it’s about understanding the room, choosing the correct materials, and installing them with precision. That’s exactly where SoundFix Acoustics stands apart. With years of hands-on experience in acoustic design and panel installation across Australia’s offices, restaurants, schools, clinical settings, and studios, SoundFix is more than just a supplier — we’re your dedicated acoustic partner.

Our team specialises in designing tailored echo reduction solutions using high-performance acoustic wall and ceiling panels. We don’t just sell products; we assess your space, identify key reflection points, and recommend the ideal combination of treatments to suit your layout, use case, and design preferences. Every installation is handled with attention to both function and finish — ensuring your environment is not only quieter, but also visually refined.

Whether you’re facing noise complaints in a cafe, struggling with focus in a noisy office, or needing privacy in a therapy room, SoundFix Acoustics brings technical knowledge, aesthetic sensibility, and proven results. Our portfolio of successful commercial projects speaks for itself. When you work with us, you’re choosing a team that understands acoustics from both the engineering and human perspective. Come to us for expert advice on how to reduce echo in your business. We’ll help you understand what’s causing the issue, and design a solution that suits your space, your needs, and your brand.