Defines the scaling factor to apply for low frequencies.

The sound.transmission.lower texture property defines the scaling factor to apply to sound.transmission for low frequencies. The scale factor changes linearly from lower to upper value depending on frequency. Walls typically filter out higher frequencies allowing lower frequencies to pass easily.

The source is typically a single positive value including 0.

The default value for this texture property is 2.8 which equals to a reduction of noise reduction capability of the material by 9dB.