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Stopping 60Hz pulsating noise form entering a room
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November 26, 2018 - 7:43 am
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Hello everyone,

I have little hope that much can be done but I thought I would ask here. I have a problem of a 60Hz hum pulsating noise in my condo apartment. The noise is there when neighbours use the HVAC system and after several years of fighting buidling management I was unable to get any solutions and since the noise is 60Hz and doens’t register in dBA there’s nothing I can do legally either.

I am a physicist, so I know that bass traps are not a good solution (the noise comes from the outside, it’s not generated in the room or resonating with it) I also know that low frequency sound does not leave much energy in materials and thus is difficult to dampen. Usual insulators such as rockwool or acoustic drywall doesn’t seem to be a good solution.

IS there anything you may know about how to insulate a room from that hum. I would be happy if I could insulate the main bedroom.

Thanks in advance!

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Chief Acoustics Engineer
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November 27, 2018 - 4:41 am
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Q, Noise issues require barrier technologies to reduce the transmission of noise from source to the receiver. Using sound absorption technology (bass traps) will not address the transmission of noise from the source to the receiver. It will reduce the amplitude at certain frequencies within the room but will do nothing to reduce the amplitude of noise transmission. You must be willing to build a room within a room that will reduce the noise transmission. Without noise measurements, it is difficult to estimate what the structure will be. However, the barrier depth requirement for a 60 Hz. noise issue starts at 6″ and can go deeper depending on amplitude.

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November 30, 2018 - 6:58 am
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Dennis Foley said
Q, Noise issues require barrier technologies to reduce the transmission of noise from source to the receiver. Using sound absorption technology (bass traps) will not address the transmission of noise from the source to the receiver. It will reduce the amplitude at certain frequencies within the room but will do nothing to reduce the amplitude of noise transmission. You must be willing to build a room within a room that will reduce the noise transmission. Without noise measurements, it is difficult to estimate what the structure will be. However, the barrier depth requirement for a 60 Hz. noise issue starts at 6″ and can go deeper depending on amplitude.  

Thank you so much for your reply. What would be the right material and configuration to build such a barrier?

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November 30, 2018 - 7:47 am
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Q, There is a process when working with noise and designing the appropriate barrier. Building it is the easier part of the process. The noise must be quantified and qualified using measurements over a 7 day time period. These measurements can be taken with your cell phone. You then send the data back to us and we design the barrier and send you drawings on its construction. The design fee for this service is 1,500.00.

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