3. TIL Films often use 'Infrasound', which is below the range of human hearing, but...

TIL Films often use 'Infrasound', which is below the range of human hearing, but can induce anxiety and fear for use in scary moments.

I can say that in the last 100 major installs of five screen sites all the way through 24 screen locations, not even one has opted for anything that goes below 20hz. Another 40 or so under 5 screens, same deal. By no means does this say that all movie theaters are the same, but even the studios I've installed in LA never used anything below 20hz, and they installed some expensive kit. Most of them stuck in kw-120-thx subs for screening rooms with one high end home opting for a p-312w which lows at 18hz. No content came to 18hz, only test content did. Fully possible that content we weren't permitted access to for private screening had the 18-19 range, but unlikely really.

It isn't to say that it doesn't exist, but no normal theater will generally be running below 20hz to cause unease in its customers. The cost just isn't worth it for the output compared to a regular theater sub. Dollar per Watt and woofer count that is.

To bed with me now. It's 2a and I'm supposed to take the family for a Christmas tree in 5 hours.

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