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The table below, taken from the very useful Sengpiel audio webpage provides some tips for getting it right, at least conceptually: A typical opaque façade (not glass) can have a sound reduction index (a reduction of SPL) of around 40 d B.
This means that if the SPL measured at the street is 70 d B, inside the façade one would perceive only 30 d B. Now, if the sound reduction index of the façade could be raised from 40 to 43 d B, the perceived noise coming from the street would equal that of reducing the source of noise by half.
In other words the audible sound has a frequency of between 20 and 20,000 Hz.The response of the human ear to sound is dependent on the frequency of the sound.The human ear has its peak response around 2,500 to 3,000 Hz and has a relatively low response at low frequencies.Even more, if the façade could be acoustically improved so that its sound reduction index raised from 40 to 50 d B (difficult but it can be done), the perceived noise coming from the street would equal that of reducing the source of noise (sound intensity) by ten: ten times less cars in the street, ten times less people celebrating the victory of their football team outside.We got the point: sound pressure level measured in d B (sometimes indicated as d B-SPL) is critical for architectural physics - a small variation can make a lot of difference.