LOUD 11-13hz generator?

[extremenoiseterror]

well, apprantly 11hz makes you shit and 13hz makes your eyeballs vibrate, resulting in hallucinations.

whats the cheapest way to make a big ass sound system that will blast this as far as possible? so sound generator to poweramps to what kind of speakers? and it is possible to make it directional at ALL?

trust me, this is for a good cause.

thanks!

[Scodiddly]

Well, you might want to wait until next Wednesday, when "Mythbusters" covers that topic.... unless you got the early scoop???

[extremenoiseterror]

it works dude, anyone thats seen sunn o))) can attest to that...

everything has a resonant frequency.

[andyg666]

depends on what you mean by cheap...

get a huge powered sub, maybe 15 or 18 inches--at least 750 watts. plug a computer output into the sub. generate a couple sine waves at -6dBfs, one at 11hz, one at 13hz. then turn the sub up kinda loud, hit play on the sine waves, and watch incredulously as no one shits their pants or hallucinates, but they all become uncomfortable from the SPLs and leave.

[andyg666]

http://www.forteantimes.com/articles/15 ... pons.shtml

[extremenoiseterror]

bump

ill be more specific.

what can i use to generate a <20hz tone? any synth modules that do this? anything i can build?

what poweramps go that low effectively?

what kind of size speaker/cab assembly should i be looking at?

help me out here kids, 13hz could be the new dope (joke)

[krylenko]

generating 11-13 hz is simple.
get a test oscillator/function generator made for lab work.
most go down to at least 0.1 hz.
check the 'bay.

good luck finding a speaker!

[extremenoiseterror]

any idea where i could get one from cheap? army surplus maybe?


oooh, you mean ebay, i see thanks!

[puffpastry]

Your problem lies in finding a speaker that will actually be able to conduct sub-sonic frequencies like this. You may well be able to find an amplifier whose AC capacity is 0hz on up, but a speaker is another story altogether.

[I'm Painting Again]

there is no inexpensive speaker that will do it..a computer and other common digital devices will not be able to generate frequencies below the nyquist filters..or 20Hz

[extremenoiseterror]

Your problem lies in finding a speaker that will actually be able to conduct sub-sonic frequencies like this. You may well be able to find an amplifier whose AC capacity is 0hz on up, but a speaker is another story altogether.

what do you mean? d low frequencies have trouble conducting to a speaker? i dont see why... can you explain?

[krylenko]

speakers are built to transduce audible frequencies, so they rarely go lower than 18 Hz.

AFAIK, speaker design gets more and more complicated as the frequency falls.
it's hard to reproduce long-wavelength (low-frequency) signals using paper/mylar cones and magnets.
11 Hz represents a lot of cone excursion, especially at high volumes.

I'm sure you can do it, but it'd be expensive.

[antonlamont45]

hey check this out, listen to the mp3's real loud on your 24 inch woofers and be sure you're near a toilet (sorry, they don't have a poo in pants emoticon yet)

http://www.museumoftechno.org/collectio ... battle.asp

[extremenoiseterror]

it's hard to reproduce long-wavelength (low-frequency) signals using paper/mylar cones and magnets.
11 Hz represents a lot of cone excursion, especially at high volumes.

I'm sure you can do it, but it'd be expensive.

if you know of a design, i have very resourceful freinds

[psychicoctopus]

The HP 204C sine wave oscillator covers 5 Hz - 1.2 MHz. It produces a very pure sine wave - no overtones. I've seen them on eBay for about $20. I have a set of 3 as part of my performance rig. Covering low low frequencies in a rock club can have strange effects - one time a shower of plaster particles started raining from the ceiling. I haven't seen anybody affected adversely by the 'brown note' though. But 20 Hz is about the lowest audible freq. I've been able to produce at a venue.