@MarkFryer369

2 months ago

Let’s talk Perceivable differences with decibels, the decibel scale is logarithmic which means successive points along an axis, or graduations which are an equal distance apart, represent values which are in an equal ratio. This is that every 5dB sound goes up it is perceived to be twice as loud the same goes for going down the scale -5dB it is perceived to be half as loud so going from 80dB to 60dB

80 to 75 Half as loud
75 to 70 Half as loud again
70 - 65 Half as loud again
65 - 60 Half as loud again

Now let’s say 80dB is equal to 100% volume
75 would be 50% volume
70 would be 25% volume
65 would be 12.5% volume
And 60 would be 6.5% volume

As you can see that is a considerable difference. (This is just a example not exact measurements but is used here to show the basic maths in this scale)

Next part
Sound transfers through air by the molecules banging into each other and frequency of sound is how fast they do that per second measured in Hertz (Hz) 1 Hz is one per second and 500Hz is 500 per second, most sounds in houses fall between 200 to 5000hz which is the frequency of a vacuum cleaner a human voice is around 400hz so blocking the movement of air will help reduce this frequency band. If you want to block lower frequencies you will need mass to stop the vibrations below 200hz the lower the frequency the higher the mass has to be.

Isolation is also a key factor in reducing sound transfer from room to room.

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