Nathan the Machinist
KnifeMaker / Machinist / Evil Genius
Moderator
Knifemaker / Craftsman / Service Provider
- Joined
- Feb 13, 2007
- Messages
- 17,947
Pity the Klipschorns roll off pretty hard below ~33Hz IIRC.
If you had some sealed subs that could do fairly high SPLs between 7 - 19Hz, you could have some fun.
Most commercial theaters roll off hard below 30 - 40Hz (even IMAX theaters) simply because it takes a huge amount of power to produce high SPLs and pressurize the large room volumes (and is even harder to isolate those high SPLs at really low Hz. When Mann's Chinese theater installed infrasonic subs for the debut of the movie Earthquake, during testing, it shook the place hard enough that plaster fell from the ceiling. They put up safety nets inside the theater).
https://en.wikipedia.org/wiki/Sensurround
High SPL LFE is easier to do with smaller/HT sized rooms.
It's why HT bassheads appreciate sound mixers/engineers like Randy Thom, who've mixed movie soundtracks to include LFE down to as low as 3Hz
I don't even have a prayer of reproducing 3Hz with my setup (some day, perhaps, when I can build a sound isolated HT equipped with a Thigpen rotary sub), but a lot of his audio tracks include LFE that will never be heard (felt?) in commercial theaters, and only a small percentage of bass nuts will build setups capable of reproducing them.
Scenes from the War Of The Worlds remake with Tom Cruise are one of my favorite bass demos (it's fun to watch the scene where the alien pod emerges at THX Reference calibrated levels, and as the ground is cracking onscreen, my walls and floor are shaking), but specifically wrt to what you mentioned, there's a scene in the first The Hunger Games (right as they're about to announce the selections), that includes an infrasonic effect (~19Hz IIRC?). It's inaudible, but causes a visceral reaction that makes your body tense. It's really cool.
Pretty sure it will do 20 Hertz at 100 dB. I backed the nails out of the walls with a set when I was a kid.
I found some brown noise infrasound on the internet. It subtly shakes the whole house and makes some spots rattle here and there. It vaguely feels like there's a helicopter hovering overhead. I haven't done it with the kids yet. Everybody's here now but I'm going to wait till Abby starts playing with a Ouija board after dark
