Good morrow everyone,
My name is Kartik and I am an electronics technologist working in the oil and gas industry here in Alberta Canada. Due to the nature of my work I am exposed to an intermittent and audible sound from one of the pieces of equipment I work on. It is loud enough that I get nauseous from it.
I took a screen shot of it using my phone and an app. The frequencies are 6.6 kHz, 7.2kHz and 14.4 kHz. They are audible with duration of less than 0.25 seconds with ~1.5 second intervals. The waveform is a square wave and it hurts to listen to it.
The most painful is the 14.4 kHz as it feels like someone is poking a needle in my ear. I have tried to drown it out with music (Note 3 with supplied ear buds) as well as hearing protection but none work as the 6.6 and 7.2 kHz just creep in. Even with background noise its very audible (I just seem to be the only one to be bothered by this noise as everyone here is "used" to it).
I was wondering if there were any recommendations based on the info I provided for circumaural closed set of cans or IEMs. Thanks for your help!