DAMPA_75_years_of_quiet_design_ENG - Flipbook - Page 32
At Det Fyenske Trælastkompagni, Fischer set himself to
work with enthusiasm, experimentally drilling wood fibre
board to try to find the solution with the density of holes that
would be easiest to manufacture and with optimal acoustic
performance. As at that time there was neither factory space
nor machinery to make the panels in-house, initially their
manufacture would need to be subcontracted to external
suppliers, which would mean producing a design that could
be made using conventional woodworking machines.
Fischer therefore decided that the best option in the circumstances was to use one-centimetre-thick soft wood fibre
board to produce panels measuring 40 x 50 cm with faceted edges. These were intended for mounting directly onto
ceiling plasterwork, which needed to be absolutely flat.
At typical human speech frequencies of 500 Hertz, 1000
Hertz and 2000 Hertz octaves, Dæmpa panels had an
absorption coefficient of between 0.6 and 0.65 while at the
4000 Hertz octave it was 0.5, which was slightly superior to
competitors’ panels.
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