More Acoustic Doorsets were recently tested at the SRL (Sound Research Laboratories) by Bespoke Complete Services with successful results. Our success will allow us to provide more products and services to this ever demanding and increasing marketplace.
The principles associated with testing for ‘acoustic’ or ‘sound attenuating’ doors & doorsets are very simple. The ‘specimen’ sample is fitted between a transmirring room and a receiving room (see pictures attached). Sound is then generated across the full frequency range determined by reference to the test standard in the transmitting room. The sound pressure levels on the receiving room side of the specimen are then measured. The sound pressure levels recorded in the receiving room can then be deducted from the sound pressure levels in the transmitting room with the resultant loss in sound presuure levels measured in decibels recorded at each of the measured frequences.
Acoustics is a term that is used in connection with doorsets and when considering the acoustics of a room or acoustics relates to a number of considerations. When sound is generated the ‘loudness’ refers to sound pressure which is expressed in decibels ‘dB’. When striking a surface some sound will be reflected, some will be absorbed and some will pass through the structure. Sound will also lose energy with distance. Other issues are the influence of sound created outside of the measured space and the ability of the structure to minimise the influence of an acoustic space by preventing or reducing the transfer of external sound through a structure. This is referred to as ‘sound attenuation’ and it is the measure that generally applies to structures between spaces. Thus when refering to acoustic doors we generally mean ‘sound attenuating doors’.
ISO 140 sets out the range of frequencies used for the purpose of testing for acoustic performances. The test procedure for the measurement of sound attenuation is described by reference to BS EN ISO 140-3: 1995