Place acoustic panels where sound first reflects towards the listener — the wall and ceiling points you can find with the mirror trick — and on parallel hard surfaces that cause flutter echo. Spread the absorption across several surfaces rather than loading one wall, use the ceiling when the walls are glazed, and put thicker absorption across corners if you also need to tackle low frequencies. Placement decides how much your panels achieve: the same number does far more in the right spots. Remember this controls sound within the room — it reduces echo and reverberation, but it does not soundproof the wall or block noise from the next room.
Start with the first reflection points
The places worth treating first are the first reflection points — the spots on the walls and ceiling where sound leaves the source, bounces once, and reaches the listener just after the direct sound. Absorbing at these points sharpens clarity for far fewer panels than scattering them at random around the room.
Find the points with the mirror trick: sit in the main listening position and have someone slide a small mirror flat along each wall. Wherever you can see the sound source — a speaker, a screen, or the person talking — mark the spot. A panel placed there intercepts the strongest early reflection on that surface.
Treat parallel hard surfaces to stop flutter echo
Bare, parallel hard surfaces trap sound bouncing back and forth between them, producing a ringing repeat known as flutter echo — the rapid, metallic effect covered in our guide to flutter echo. The usual culprits are two facing plaster or glass walls, or a hard floor beneath a flat ceiling. You only need to break the path once, so treating one of the two facing surfaces with an absorptive or profiled panel is enough to stop the flutter — you do not have to cover both.
Where should I put acoustic panels in a room?
Spread the absorption around the room rather than loading it all onto a single wall. A cluster on one surface leaves the opposite and adjacent hard surfaces reflecting freely, so the same panels do more when distributed across two or three surfaces at listening height. Aim for the walls people face and speak across, plus the ceiling, rather than one decorative feature wall.
Balancing wall and ceiling treatment is a room-by-room decision — the ceiling is often the largest free surface, while the walls handle the reflections that travel at ear height between people. Our guide on walls versus ceilings covers how to split the treatment between the two.
Using the ceiling and corners
When the walls are mostly glazed or crowded with joinery, there is little free wall to treat and the glass reflects sound straight back. Here the ceiling does the work: an absorptive lining, or suspended clouds and rafts hung over the seating or desks, adds plenty of absorption where the walls cannot.
Corners are worth a look if you also want to address low frequencies, because bass energy builds up where surfaces meet. Thin porous absorbers, slat panels included, do the bulk of their work across the speech range rather than at deep bass, so corner treatment — see low-frequency absorption and bass traps — is where you reach the low end.
Placement versus how many panels you need
Placement and quantity are two different questions. This guide is about where the panels go; how much absorption the room needs in total is a separate calculation covered in how many acoustic panels you need. Get both right together — the correct amount of absorption, positioned at the reflection points and parallel surfaces that matter — and a modest number of panels can change how a room sounds. For a regulated or high-stakes space, an acoustician should model the layout against measured data rather than headline figures.
Frequently asked questions
How do I find the first reflection points?
Use the mirror trick. Sit in the main listening or seating position and have someone slide a small mirror flat along each wall, and ideally the ceiling. Wherever you can see the sound source reflected in the mirror, that spot is a first reflection point and a good place for a panel. It takes a few minutes and needs no equipment.
Should acoustic panels cover a whole wall?
Not usually. Spreading the same panels across several surfaces — two or three walls plus the ceiling — controls more reflections than concentrating them on one wall. A full feature wall looks striking and does absorb, but acoustically you often get more even results by distributing the absorption around the room at listening height.
Do acoustic panels work better in the corners of a room?
Corners help specifically with low frequencies, because bass energy builds up where surfaces meet, so thicker absorption spanning a corner reaches lower notes than a thin panel on a flat wall. For mid and high frequencies — speech clarity and echo — the first reflection points and parallel walls matter more than the corners.
Will placing panels well soundproof my room?
No. Careful placement makes absorption more effective at reducing echo and reverberation within the room, so speech sounds clearer to the people in it. It does not stop sound passing through the walls, floor or ceiling to another room — that is sound insulation, which depends on the mass and construction of the structure, not on absorptive panels.