Could you please advise the simplest method to reduce low frequency noise from windows?
- Somewhere outside there is a source of noise with frequency of 166 Hz. I can’t neither find nor remove it. This could be ventilation hoods on other houses, factories or something else. Let’s take this as granted.
- I have windows which consist of packets of 3 glasses each 4 mm of width which I can’t change.
- As the result there is a buzzing noise in the room in 166 Hz frequency (and I see 49 Hz as well). The noise on these frequencies about 20-25 dB higher than on other surrounding frequencies.
What I tried to do:
- I put shields made of expanded polyethylene about 2 cm thick and this didn’t help at all, low frequency sound passes through easily. Again, these are still windows, not good idea to cover them.
- I put suction cups towel holders (made of plastic) on windows, to made it harder for glass to vibrate and it helped a little bit. They are not so massive, so effect is low.
- Of course, I can buy weighty glass cubes and glue them to windows instead of suction cups towel holders, this could help bit more.
- I can put extra pressure on these suction cups towel holders by planks attached to window frames.
But are there any better ideas how to cancel the noise from window on the specific low frequency?