This might be slightly off topic but I'm trying to find the source of a 2.2khz noise in my neighborhood. I live in Astoria, NY near the intersection of two subway/amtrack trains. At seemingly random times, at various decibel levels, averaging about 75db in my house and 85db outside...there is a very annoying noise coming from I don't know where. It's driving me nuts and has been happening off and on again for weeks. Some other neighbors have also noticed the noise. I was wondering if there is a known, common source of noise right around 2.2khz? Like large capacitors or power lines, something like that. Any help would be much appreciated.
I made a recording http://media.jasonormand.com/2khz-noise.ogg