Wood acoustic panels: what they really do

Wood is hard and dense; it throws sound back like a plastered wall. That a wood panel still helps against reverberation comes down to three things: the open slots or holes between the slats, the soft layer behind them (felt, acoustic fleece or mineral wool), and the distance to the wall. Sound travels through the openings into the soft material and is converted into heat there.

This gives the most important buying rule: it is not the wood that decides, but what happens between and behind the wood. A panel with wide slats, narrow gaps and thin felt looks just like a certified acoustic system, yet absorbs far less.

The popular felt-backed slat panels are not fake: compared with a bare wall they audibly improve the room, especially at mid and high frequencies, exactly where voices and clattering dishes live. Their limits: the felt is usually only 9 to 19 mm thick and sits directly on the wall. Such a build-up barely reaches low frequencies, and total absorption stays below a certified system.

Wood acoustic systems from commercial construction work with more open area, a thicker absorber layer (often 30 to 50 mm) and a cavity behind the board. Such build-ups reach measured αw values up to classes B and A. The difference is not in the ad copy but in the test report: whoever states an ISO 354 measurement including the build-up has something to show.

Three pieces of information separate an acoustic product from a decorative panel. First, a measurement: the weighted sound absorption coefficient αw from an ISO 354 reverberation-room test, ideally with the absorber class (A to E). Second, the tested build-up: slat or perforation ratio, type and thickness of the backing, distance to the wall. The value applies only to exactly that build-up. Third, for offices and public rooms, the fire class; wood acoustics usually reaches flame-retardant (B-s1/s2).

Without these, you are buying looks. That can be perfectly fine, just do not expect room acoustics. The Acoustic Index catalogue stores per-band measurement data for every listed product so panels can be compared honestly.

As a rule of thumb for a normally reverberant living or working room: roughly 15 to 25 percent of the floor area as effective absorber area, so about 3 to 5 m² of well-absorbing surface for a 20 m² room. The weaker the panel, the more area you need for the same result; that is exactly why the αw value matters.

For placement: go where the sound comes from and reflects. In living spaces that is the large free wall areas at ear height, ideally on two opposite sides, or the ceiling. A full slat wall is attractive and acoustically sensible if the build-up is right. For a precise design, the reverberation calculator works with real product data.

For acoustics the surface hardly matters: whether solid oak, real wood veneer or decor foil, the openings and the absorber layer decide. For looks, durability and indoor climate there are differences: veneer on a carrier board is dimensionally stable and usually cheaper than solid wood; foil is the budget option and ages most visibly.

For ecological building, look additionally at the carrier board (emissions, certificates) and at the absorber layer; besides mineral wool, PET fleeces from recycled material are increasingly used. Some manufacturers in the index provide environmental product declarations (EPD), which can be filtered in the search.