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Transformers generate low-frequency humming noise. The noise frequency is typically 60Hz and 120Hz. This video showed the noise level before and after the soundproofing treatment. Walls were lined with a sound absorber, Megasorber P100. It is 100mm thick sound absorber with a water / fluid repellent, non-combustible and sound-absorbing Soundmesh G8 facing (grey). It is specifically designed to absorb low-frequency noise and for outdoor applications.