Natural Science Forum / Physics / Acoustics / October 2008

There is a plant room with a noise level of approx. 90dB(A). The room
´s boundaries are made of solid concrete. Does anybody know how to
calculate or arrive to an approximate value of how much noise will
leak to the room upstairs via the side walls (the room upstairs has

I have recently seen a system in an auditorium (mainly used for
classical music) where a temperature rise system was installed
underneath the stage. The idea was that by rising the temperature at
different parts of the stage they could enhance certain frequencies.