The "I need 4hz 130db infrasound" project - Page 2 - AVS | Home Theater Discussions And Reviews
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post #31 of 41 Old 03-03-2014, 04:14 PM
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Like someone said before buy a van. It does not even have to run. Then do what the car audio SPL guys do gut the interior and fill the floor sides and roof with cement and re bar.
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post #32 of 41 Old 03-03-2014, 04:47 PM
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Quote:
Originally Posted by BassThatHz View Post

As Beast was saying, the other problem will be the mic (aco-pacific?). I know the TermLab can 10hz and probably a good 160db, but it won't do the last 9 hz.

I should correct myself, now that I have one in my hands. The TermLab will measure 2hz @ 183db.
The aco-pacific is probably superb too under 160db, but even more expensive(?)
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post #33 of 41 Old 03-03-2014, 04:47 PM
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LTD02 has the right idea. You need tactile transduction for freqs this low. If this guy builds a concrete bunker and manages to get 130dB at 4Hz, he will only get an ear-popping sensation at 4x per second, and hear distortion components, to which our ears are many orders of magnitude more sensitive.

People do not realize that infrasound is just that. Although the cochlea is the main hearing device (even for infrasound), resonances, especially in furniture or a suspended floor, convey the sensation more completely.

Do like Folgott and build a passive riser, or an active one with Crowsons.

First things first, though, if you are dead set on doing this SPL-wise. Spend the several thousands of dollars necessary to get accurate measurement gear for this project, or it is all for naught. And no, 'cal files' from Home Theater Shack for your SPL meter are not gonna be good enough.


JSS
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post #34 of 41 Old 03-03-2014, 06:04 PM
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Quote:
Originally Posted by Bombelman View Post

homeomnimax, could you share titles and sources with this nice infrasonic sound ? 4Hz Waterfalls would be nice 🍹 Thanks !!

For music, a few tracks that have some infrasonic pulses of bass that probably aren't well known are:
Bjork - Hyperballad (Fluke Mix) (<15hz, synthetic)
Michael Jackson - Beat It (<15hz, synthetic)
Yael Naim - New Soul (<15hz, mic sounds)
Liu Ziling - 北风吹 影片《白毛女》插曲 (<15hz, mic sounds)
UHP - Dragonfly (15 to 20hz, synthetic)
Norah Jones - Sunrise (15 to 30hz, bass string)
Massive Attack - Teardrop (15 to 30hz, synthetic)
Leigh Nash - Just a Little (15 to 30hz, mic sounds)
Katie Melua - Nine Million Bicycles (20 to 30hz, drums)
Regina Spektor - Eet (20 to 30hz, drums / synthetic)
John Newman - Love Me Again (20 to 30hz, synthetic)
Halou - Tubefed (20 to 30hz, synthetic)
Sarah McLachlan - Back Door Man (20 to 30hz, synthetic)
Sarah McLachlan - Black & White (20 to 30hz, mic sounds?)
Alanis Morissette - The Guy Who Leaves (20 to 30hz, synthetic)

That's about all I have that isn't specifically bass-music / rap / dub / techno / electronic / classical crescendos etc, that could be expected to have lots of mainstream purpose-built bass.


That said, Bass Mekanik - Moonstone is one of my favs, it's basically music set to a 20hz sinewave. LOL biggrin.gif


For movies I heard Elysium has some crazy deep stuff in it, like <10hz.
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post #35 of 41 Old 03-04-2014, 08:55 AM
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16 SI HS 24" in 28 cubic foot enclosures each fed with 70 volts?

Should do 130db at 10hz outdoors... figure ina good amount of room gain and I'd say you're golden.
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post #36 of 41 Old 03-04-2014, 09:48 AM
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Quote:
Originally Posted by BadmanSound View Post

16 SI HS 24" in 28 cubic foot enclosures each fed with 70 volts?

Should do 130db at 10hz outdoors... figure ina good amount of room gain and I'd say you're golden.

AND, it will only cost you $12,800 in drivers alone (plus shipping of course), at least until the price hike on the 24's happens. Add another $3-4k for amps and build yourself a small concrete room. Goals.....met!

Seriously though, I hope that the OP is listening to the wisdom around here.
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post #37 of 41 Old 03-04-2014, 10:44 AM
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Quote:
Originally Posted by BassThatHz View Post

For music, a few tracks that have some infrasonic pulses of bass that probably aren't well known are:
Bjork - Hyperballad (Fluke Mix) (<15hz, synthetic)
Michael Jackson - Beat It (<15hz, synthetic)
Yael Naim - New Soul (<15hz, mic sounds)
Liu Ziling - 北风吹 影片《白毛女》插曲 (<15hz, mic sounds)
UHP - Dragonfly (15 to 20hz, synthetic)
Norah Jones - Sunrise (15 to 30hz, bass string)
Massive Attack - Teardrop (15 to 30hz, synthetic)
Leigh Nash - Just a Little (15 to 30hz, mic sounds)
Katie Melua - Nine Million Bicycles (20 to 30hz, drums)
Regina Spektor - Eet (20 to 30hz, drums / synthetic)
John Newman - Love Me Again (20 to 30hz, synthetic)
Halou - Tubefed (20 to 30hz, synthetic)
Sarah McLachlan - Back Door Man (20 to 30hz, synthetic)
Sarah McLachlan - Black & White (20 to 30hz, mic sounds?)
Alanis Morissette - The Guy Who Leaves (20 to 30hz, synthetic)

That's about all I have that isn't specifically bass-music / rap / dub / techno / electronic / classical crescendos etc, that could be expected to have lots of mainstream purpose-built bass.


That said, Bass Mekanik - Moonstone is one of my favs, it's basically music set to a 20hz sinewave. LOL biggrin.gif


For movies I heard Elysium has some crazy deep stuff in it, like <10hz.
Nice list of infrasonic bass tracks! I love Bjork, I will have to check out that Hyperballad remix.

Got any more? smile.gif
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post #38 of 41 Old 03-04-2014, 02:04 PM
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If I drive my car with only one window open I get a pretty gnarly low frequency buffeting.. enough to make my ear drums instantly hurt.. although even that I think is something higher than 3Hz.. but not much.
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post #39 of 41 Old 03-04-2014, 02:35 PM
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Quote:
Originally Posted by dtsdig View Post

AND, it will only cost you $12,800 in drivers alone (plus shipping of course), at least until the price hike on the 24's happens. Add another $3-4k for amps and build yourself a small concrete room. Goals.....met!

Seriously though, I hope that the OP is listening to the wisdom around here.

and about 30 sheets of 3/4 plywood (3x3x3 foot enclosures, 54 sqaure feet of ply per enclosure before bracing, with a single baffle). I suppose 4x clones will do it amp wise. About 20k on enclosures/power/cables etc. Rob a construction site of a couple pallets of cinderblocks and you are well on your way smile.gif.
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post #40 of 41 Old 03-04-2014, 03:28 PM
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Quote:
Originally Posted by homeomnimax View Post


I'm trying to create an all purpose audio mastering room capable of incredibly low "infrasonic" bass response on what's actually a fairly low budget relative to the performance
.



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post #41 of 41 Old 03-04-2014, 05:14 PM
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I've been hit by a column of air at over 171mph before (and survived to tell about it). That's 9100cubic feet of air per second, you do the math....
That's the closest approximation of 0Hz I have ever "felt". At that speed even AIR feels like water.

How... you ask?
Skydiving.

Especially my first jump; it is something you never forget!
I'll never forget the sensation of the air at those speeds... air does have a texture after all wink.gif

In just one skydive, you plow through roughly 1 million cubic feet of air (at 120mph+).

How's THAT for displacement? hehe biggrin.gif


^^^ not me, but VERY EPIC and interesting none the less. (4min 20s and then 9min 40s if you're impatient and want to skip to the good parts)
Quote: "A few inches to the right and everyone would have been roadkill" eek.gif (RECKLESS ENDANGERMENT MUCH?)
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