Fundamentals
Room Acoustics Fundamentals
Reflections, reverberation, standing waves, and the measurements that describe them.
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Room Acoustics & Soundproofing
Quieter rooms, clearer sound.
A reference on how sound behaves inside a room, why acoustic treatment and soundproofing solve different problems, and what tends to work in Canadian homes, condos, and home studios.
20 Hz–20 kHz
Approximate range of human hearing that room behaviour must account for.
RT60
Reverberation time: how long a sound takes to decay by 60 decibels in a space.
STC / NRC
Two separate ratings: one for sound isolation between rooms, one for absorption within a room.
Two different goals
Treatment changes how a room sounds. Soundproofing changes what gets in or out.
These two ideas are often confused. Acoustic panels make a room sound better to the people inside it; they do little to stop noise passing through a wall. Reducing transmission needs mass, sealing, and decoupling instead.
Acoustic treatment
Porous absorbers and bass traps shorten reverberation and tame reflections. Measured with the Noise Reduction Coefficient (NRC), a value from 0 to 1.
Soundproofing
Blocking transmission relies on mass, airtight sealing, and decoupling the structure. Lab performance of assemblies is summarised by the Sound Transmission Class (STC).
Diffusion
Scattering surfaces spread reflected energy evenly instead of removing it, keeping a room lively without harsh echoes or flutter between parallel walls.
Where it matters in Canada
Cold-climate construction shapes the trade-offs.
Many Canadian homes use wood-frame walls and floors, and a large share of urban living happens in multi-unit condos and apartments. That mix puts airborne noise (voices, music) and impact noise (footsteps overhead) at the centre of most complaints.
Resilient channels, additional drywall layers, and acoustic sealant around penetrations are common retrofit measures. The National Building Code of Canada sets minimum sound-transmission requirements for separations between dwelling units, which local codes adopt and may exceed.
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Articles
Reference reading
Comparison
Treatment vs Soundproofing
Why absorbing reflections and blocking transmission are separate jobs with separate materials.
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Canada
Soundproofing Canadian Condos
Airborne and impact noise between units, and the retrofit measures that address each.
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Reading a spec sheet
NRC and STC are not interchangeable.
A product page may quote both numbers. Knowing which one answers your question prevents buying the wrong material. The block on the right shows how the two ratings map to different problems.
Absorption ratings near 1.0 indicate a material removes most reflected energy at the tested frequencies. Transmission ratings describe a complete wall, floor, or ceiling assembly rather than a single product.
NRCabsorption = energy taken out of the room
range : 0.00 → 1.00
solves : echo, reverb, flutter
example: porous panels, bass traps
STCtransmission = sound passing through
applies: whole wall / floor assembly
solves : neighbour noise, leakage
example: mass + sealing + decoupling
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