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What is Transmission Loss?
Transmission loss is the measurement of the volume (dB) difference on either side of a wall.
Let’s say there is a loud sound on one side of your wall (maybe your son playing the drums?)
that registers at 100dB. We go to the other side of your wall and measure the volume there,
and that only registers at 75dB. The difference between the two walls is 25dB, so we could
say there is a 25dB transmission loss, meaning 25dB less sound made it to the other side of
the wall.
The interesting thing about this type of measurement is that the same wall may have a different
level of transmission loss if the pitch changes. So even though there might be 25dB less sound
when your kid is playing the drums, there may only be 4dB of sound loss when someone is
vacuuming in the same room.