Announcements are clear at the front and lost at the back
Echo in a church hall
Stone walls, a timber floor, a high ceiling and almost nothing soft in the room. A church hall is close to the worst case for speech, which is why the back three rows give up during announcements and why the AGM takes twice as long as it should.
Hard surfaces return almost all the sound energy that hits them, so each word keeps arriving long after it was spoken.
The next word then lands on top of the tail of the last one. That overlap is what destroys intelligibility — it is not a volume problem, which is why shouting does not help.
A hall this size holds a great deal of air, and the more air there is, the longer the energy takes to be absorbed.
- ·Announcements are clear at the front and lost at the back
- ·Two conversations at once and nobody can follow either
- ·Music sounds enormous; speech sounds like mush
- ·Everybody raises their voice, which makes it worse
Typical church hall
20 × 12 × 8 m, stone walls, timber floor, painted plasterboard ceiling.
Around 1.0 to 1.2 seconds is the usual aim for a hall used mainly for speech.
- I.Class-A ceiling panelsabout 200 m²
The fastest route. Ceiling area is usually available and doing nothing.
- II.Fabric-faced wall panelsabout 180 m²
Gets you most of the way where the ceiling is listed or unreachable.
- III.Carpet with a thick underlayabout 240 m²
Roughly three quarters of the job, and it fixes footfall noise too.
- IV.Heavy lined curtainsabout 150 m²
About half the job. Useful where the walls must stay untouched.
- V.Upholstered chairs instead of stacking chairsabout 120 seats
Changes a hall measurably on its own, and nothing gets fixed to a wall.
Indicative figures for the example room (20 × 12 × 8 m, about 1,920 m³), from the same method the report uses. Your room will differ, which is the point of checking it.
Questions from the pews
Do I have to use acoustic panels?+
No. Absorption is absorption — carpet, curtains and upholstered seating all count, and for many halls a combination is cheaper and far less intrusive than panels. We do not sell any of it, which is why we show you all of it.
Will this help with noise from outside?+
No, and it matters not to confuse the two. Absorption changes how a room treats sound made inside it. Keeping sound out is insulation — a different job, different products, different survey.
Is the figure you give me a survey?+
No. It is an indicative prediction using the same standard method an acoustician starts from, and it is meant for deciding what to do. Where a formal figure is required, a measured survey to BS EN ISO 3382-2 is what confirms it.