By Carl Lukings
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April 29, 2020
My parents liked the change and my father was often looking for a new challenge with his work in IT. One of the things I have always remembered whenever we moved into a new home was how the house felt so hollow with no furniture, just blank walls and floors. It was even more noticeable in an empty bathroom. I remember my brothers and I standing in an empty bathroom hollering at the top of our lungs, listening to the echo. Although I had very little interest in sound or audio at 12 years old, I understood something about acoustics. When the shower curtain and bath towels were hung, the bathroom quickly went from being a cavern to a small room. The principals haven't really changed much over the years. The fact is, some rooms, for numerous reasons, have acoustic characteristics that make them much more reverberant than others. Sometimes it's the hard uncovered surfaces. Or it could be a tin-pan ceiling. More often than not it's the physical dimensions of the room, allowing for some frequencies to reflect for a long period of time before diminishing. One way to determine and quantify the "issue frequencies" is to play a frequency sweep within the space and then record the playback with a microphone in the room. What this does is provide us the ability to "hear" and analyse how the different frequencies are responding in the space. Using a measurement referred to as the RT60 we are able to determine which frequencies and to what extent each frequency is a problem. From there, we're able to take that information and determine how much acoustic treatment is required to bring the RT60 reverberation time down to a reasonable level.