The mix-up that costs people the most money
It's the most common conversation in any acoustics forum:
"I bought 30 foam panels to soundproof my room and my neighbour still hears me play the drums."
The problem isn't the product, it's the concept. Soundproofing and acoustic treatment are two different disciplines, with different physics, different materials and different prices. Confusing them leads you to buy the wrong product for the wrong problem.
Let's separate them clearly.
Soundproofing: blocking sound transmission
Soundproofing means preventing sound from passing through an enclosure — wall, floor, ceiling, window or door. The goal is for sound on one side not to reach the other.
The 4 physical principles of soundproofing
- Mass: the heavier the enclosure, the more sound it stops. Doubling mass reduces transmission by ≈ 6 dB (mass law)
- Decoupling: mechanically separate the two faces of the enclosure (double drywall with independent framing, floating floors)
- Internal absorption: fill cavities with rock wool or fibreglass so they don't resonate
- Airtightness: any gap kills isolation. A hole representing 1% of the area can reduce real isolation by 20 dB
Typical materials
- Drywall panels 15-25 mm
- High-density fibre cement boards
- Rock wool 40-70 kg/m³ inside the cavity
- Viscoelastic membranes (Tecsound, Soundproof)
- Elastomeric strips to decouple framing
- Acrylic sealants for airtightness
Cost and construction work
Properly soundproofing a 12 m² room means construction: double-layer drywall lining, floating floor, acoustic door, laminated window. Realistic cost: €3,000-8,000, depending on the isolation level sought and starting condition.
Acoustic treatment: controlling how the room sounds inside
Acoustic treatment means modifying sound behaviour inside the room — reflections, reverb, modes. Sound still leaves and enters exactly as before; what changes is how it's heard inside.
Problems it solves
- Excessive reverberation time (high RT60)
- Early reflections at listening points
- Room modes (bass resonances)
- Metallic echo between parallel walls
- Diffuse stereo imaging
Typical materials
- Foam or wool absorber panels 40-100 mm
- Porous corner bass traps
- Tuned membrane resonators
- QRD and skyline diffusers
Cost
Acoustically treating a 12 m² home studio is between €200 and €800 without construction. Panels are hung or glued, requiring no masonry.
Comparison table
| Aspect | Soundproofing | Acoustic treatment | |---|---|---| | Goal | Prevent sound between rooms | Make the room sound good inside | | Physical principle | Mass + decoupling + airtightness | Absorption + diffusion | | Materials | Drywall, dense wool, membranes, sealants | Technical foam, wool, panels, bass traps, diffusers | | Typical cost (12 m²) | €3,000-8,000 | €200-800 | | Requires construction | Yes | No | | Solves "neighbour noise" | Yes | No | | Solves "my mix sounds bad" | No | Yes | | Execution time | 1-3 weeks | 2-4 hours |
Why acoustic panels do NOT isolate
This is the most important thing to understand: an acoustic panel hung on the wall does not add meaningful mass to the enclosure. A typical panel weighs 1-2 kg/m². The wall it's glued to weighs 50-200 kg/m². The panel's contribution to isolation is negligible.
What the panel does is absorb some of the sound bouncing inside your room. This slightly reduces the average level (because there's less accumulated energy) — maybe 2-3 dB. But it does absolutely nothing to stop direct sound from crossing the wall into the adjacent room.
If your neighbour hears you, you need isolation. Full stop. More panels won't help.
When you need each
You need soundproofing if:
- The neighbour complains about noise
- You hear the upstairs TV
- You want to record drums without dragging anyone out of bed
- You live near a noisy street that ruins your recordings
- Someone is sleeping in the next room when you play
You need acoustic treatment if:
- Mixes don't translate well to other systems
- Sound changes a lot depending on where you sit
- You notice echo or natural reverberation in the room
- Bass is uncontrolled or disappears
- Stereo imaging is confused
You need both if:
- You have a professional studio where you record and mix
- You work in a noisy area and also need to mix precisely
- The room will be used many hours per day with monitors at high volume
The classic mistake: half-isolating
Many people try to "isolate cheap" using materials that aren't isolation materials. For example:
- Egg cartons → no mass, no isolation, do absorb highs (badly)
- Blankets and mattresses → don't isolate, absorb some mids and highs
- Pyramid foam glued to the wall → doesn't isolate, partially absorbs highs
- Door seals → adds airtightness but without lining the effect is marginal
These solutions sometimes cut 1-2 dB of transmission, but the problem stays. And because they improve "something", people think they're on the right track and keep buying more inadequate material. The result is a room full of stuff that neither isolates nor treats well.
The verdict
Before buying anything, decide what problem you're solving:
- Do I want sound not to go out / not to come in? → soundproofing, requires construction and serious budget
- Do I want my room to sound better inside? → treatment, accessible modular products
Both are legitimate goals but they are not interchangeable and cannot be stacked with the same product. Knowing which problem you have saves you hundreds of euros and months of frustration.
If your goal is to produce music, mix or record clean voice, what you need is treatment. Our acoustic configurator calculates exactly how much and where, free, in 2 minutes.