Schumann's Resonance 7.83Hz

[trip01]

http://en.wikipedia.org/wiki/Schumann_resonances

7.83Hz would be a ground moving experience rather than an audible sound.

Anyone experienced this ?
How to measure or replicate from a bass rigg

[mikeddd]

Without a very, very, very long folded horn/transmission line, you won't get anywhere near 10Hz, let alone 7.83 Hz. We're talking big driver and a cab long enough to go back to the next county, double back, and come out somewhere near where it started. Of course "10Hz" as a specification is useless without an attached dB level. Big home theater systems that can acheive say, 100dB @20Hz require lots of power and/or lots of cone area. If you have good ears you can barely hear 20Hz anyway, regardless of the dB level. Anything below that either tickles your fancy or involuntarily makes you move your bowels, given the right amplitude.

[jarrhead]

Sounds like an insanely awesome idea.

[iamlowsound]

Originally Posted by trip01

http://en.wikipedia.org/wiki/Schumann_resonances

7.83Hz would be a ground moving experience rather than an audible sound.

Anyone experienced this ?
How to measure or replicate from a bass rigg

Lots of drivers (size doesn't matter, no matter what others on here will say) and a whole lot of extremely clean headroom. I can get an 11hz wave to rumble with my rig and it isn't that big. I figure that if you doubled the size, you could hit 7.83hz. Although I would much rather try with a full stadium PA.

lowsound

[TheSuzie]

This refers to electromagnetic radiation not sound. You're dealing with an antenna not a electromechanical driver.

AFA looking at those frequencies in the bass world: signals at those frequencies are easily seen on certain scopes or can be acquired by a computer with the right interface. To see mechanical movement at those frequencies one can use various pressure transducers or possibly make one from a strain gauge.

Peace,
S

[T-Bird]

Hi.

A controllable lo-freq audio is most likely easiest (cheapest) to produce with a servo-driver.

A non controllable lo-freq audio is easiest to produce with a mechanical crank-operated cone/piston. A bit like they did on Myhbusters. But on Mythbusters they do everything half-assed and the failure is the goal, not actual working devices .

Regards
Sam

[ianmatth]

Experienced this at the Phish concert at UF in 1994. Couldn't hear it, but 10,000+ people could feel it. It made you feel like gravity was twice as much, you literally saw the whole crowd slump down. Not sure how they did it, someone said they probably had a speaker with a magnet and no cone.