How to reduce echo in a room and plan acoustic panels

Listen to ordinary speech from the sofa, the dining table or your desk. Reverberation is the sound that lingers as reflections return from surfaces. A handclap can make those reflections easier to notice, but it is not a calibrated measurement and does not reliably identify one wall as the only cause.

If the main problem is traffic, footsteps upstairs or voices through a wall, sound absorption is only part of the picture. Those problems can require work on the noise source or the building's sound insulation.

Bare plaster, glazing, a hard floor and a large table can all contribute reflections. Rugs, curtains and upholstered furniture can add absorption while changing the room's colour and texture. Their effect varies with the material and the frequencies involved.

Acoustic wall art adds another absorbing surface where furniture or textiles may not fit. It can be planned as part of the interior rather than added only after everything else is chosen.

There is no universal panel count for a room of a given floor area. Ceiling height, room shape, glazing, furniture, panel performance and your desired result all affect the amount needed.

You can still compare physical coverage. A set of two 60 × 60 cm panels has 0.72 m² of front surface; two 60 × 80 cm panels have 0.96 m²; two 70 × 110 cm panels have 1.54 m². These are geometric areas, not measured acoustic absorption areas or a promise of a particular result.

Look for exposed hard walls near the areas where conversations happen. Keep the panel faces clear of tall furniture. In an open-plan room, consider more than one area instead of assuming that one composition treats the entire space.

Use removable tape to mark the composition, including gaps between panels. Check the wall construction and mounting instructions. The location needs to make visual and practical sense as well as leave the material accessible to sound.

After making changes, listen from the same positions during normal use. Start with the question that prompted the work: does conversation still linger, or is the remaining problem a separate noise source?

If you need a specified reverberation time, are fitting out a large room or are unsure about the amount of treatment, ask an acoustic professional for measurements and a plan. A photograph and floor dimensions alone cannot establish an exact acoustic outcome.