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The Quietest Place on Earth Can Drive You Mad in Less Than an Hour


Photo: Steven Orfield/Orfield Labs

If you think that loud noises drive you mad, try this quiet room for a change.

The anechoic chamber at Orfield Laboratories in South Minneapolis, certified as the quietest place on Earth by the Guinness World Records, is so quiet that the longest anyone has survived being in there is just 45 minutes:

‘When it’s quiet, ears will adapt. The quieter the room, the more things you hear. You'll hear your heart beating, sometimes you can hear your lungs, hear your stomach gurgling loudly.

‘In the anechoic chamber, you become the sound.’

And this is a very disorientating experience. Mr Orfield explained that it’s so disconcerting that sitting down is a must.

He said: ‘How you orient yourself is through sounds you hear when you walk. In the anechnoic chamber, you don't have any cues. You take away the perceptual cues that allow you to balance and manoeuvre. If you're in there for half an hour, you have to be in a chair.’

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i have to say i have experienced this fr my self and it is very over rated i stayed in it for 2 and a half hours and nothing at all
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I think it's cool. I think every home should have one as a stress reliever. Imagine coming home from a busy, loud day at work and walking into that for 5, 10 minutes..or if you are a stay at home mom at your wits end, until you chill in the chamber for an energy recharge! <3
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I once camped in the Anza-Borrego Desert of California, where it was so quiet that I could hear my heart beating. It was so disturbing that I couldn't sleep.
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The cutoff frequency (below which the chamber ceases to be anechoic) is pretty much a function of the size of the wedges.

That's right Ray, the wedges will measure out to being 1/4 of the wavelength of the lowest frequency they can absorb. Bellow that, the sound will reflect (which is why you can start to hear your own heartbeat, breathing etc.).
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UGH I would hate it!
I can't stand it when it's too quiet when I'm trying to get to sleep b/c I hate hearing my heart beat in my ears.
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Identical to the chamber we used at Nortel. First, anechoic (no reflections) is not the same as quiet (no external sounds leaking in), though anechoic chambers strive to do both. The cutoff frequency (below which the chamber ceases to be anechoic) is pretty much a function of the size of the wedges. IIR, ours was good down to about 50Hz. I spent some time in ours, it's not really a big deal, but the sensation is similar to having a stuffed-up head. And it's hard to talk to someone if you face away from them.
The chamber was in a huge brick cube mounted on rubber blocks. Pretty neat.
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Wait, what do they mean by "quiet"?

For starters, I don't see any figures here. And what those figure would reveal is not how quiet something is, but at what frequencies and at what times it is quiet.

The efficiency of an anechoic chamber is expressed by the lowest frequency at a given T-60 (T-Sub-60) measurement. That is, T-60 is the (T)time it takes for a given frequency to drop by 60 dB .

Example, if you put a blast of 120 dB white noise through a speaker in the middle of a basketball gym, and cut the signal, how long will the 1K frequency reverberate and echo before it's strength is 60 dB lower than when you turned off the sound source?

It's fairly easy to cut the reverberations (i.e. make something anechoic) of, say, a 10K Hz or 5K Hz tone. Making something anechoic at 175 Hz or less becomes MUCH more problematic.

I've worked in anechoic chambers that are, in the parlance of the industry, "dead" down to ~90 Hz. Actually, I've spent hours in them, and I don't know what all this stuff about "ooo-aaa, you can only spend 25 minutes in there, scary!!' is.
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Sounds like a real trip. I'd love to check it out just to contrast it with regular life.

That said, I got a fan on now in my apt and love the white noise.
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