The Biggest (siz), the Loudest (dB), the Lowest (Hz), the Baddest DIY SUB of them all - diyAudio
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Old 11th October 2014, 06:39 PM   #1
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Exclamation The Biggest (siz), the Loudest (dB), the Lowest (Hz), the Baddest DIY SUB of them all

Is there in this world a subwoofer so bad that it can go lower than one Hertz, like 0.1Hz and with less than 10% THD and @ 120dB level, or more, and that man would be able to survive, if installed in a home?

...Like a horn loaded sub, or a rotary one for example. ...Can it be build?

Or! What is the world's baddest sub of them all, right now, on this planet?
And it don't matter how many drivers it consists of. ...And how huge it is.

What is the most decibels (subterranean bass) can you get in a room (in-room response), when sitting @ the MLP? ...And the lowest extension ever recorded?
And! Is it sustainable for a reasonable period of time with very very low distortion (THD & IMD)?

I just want to know. ...About the limit of mankind when it comes to Subwoofing (Diy type of). ...Or Pro already done, or the extent of possible outcome from what is humanly possible.

And I mean on the entire planet, including France, UK, Germany, Russia, Brazil, Italy, Spain, China, Japan, etc., and not just here in America (USA & Canada), or in this DiyAudio forum.

I saw another thread talkin' 'bout 5Hz extension @ 125dB in-room response.
But that won't simply cut it; it ain't low enough, and it definitely not loud enough.

I'm talkin' somethin' like 0.1 Hertz here and approaching 200 Decibels.
I'm just curious, of what is the ultimate limit of what have been already created, or of what can be created.

Please, help me out, I got a new project comin' up, and I need to know before the beginning of next year (2015).

Oh, I almost forget: What size subwoofer drivers are the most efficient and with the less distortion and the best extension and best speed and best accuracy (delineation and excursion) and best of all that jazz?
...10", 12", 15", 18", 24", 32", 36", 48", or larger?

Thank you in advance to all Diy experts here, and best of luck with your suggestions, scientific explanations, and all that blues.

Best cheers and regards to all my friendly Diy community,
Bob
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Old 11th October 2014, 06:49 PM   #2
zobsky is offline zobsky  India
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Old 11th October 2014, 06:50 PM   #3
sine143 is offline sine143  United States
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Build concrete bunker with 20 foot thick walls and ceilings (only needs to be big enough for the subwoofer boxes (1700 cubic feet) and the listener).

install 5000 amp 3phase 240v electrical service.

order 256 18 sound lms ultras, stuff em in six cubic fet sealed a piece.

Order enough amps to be capable of around 1000kw of output

Add massive amounts of boost down low.

... and you are still not anywhere near 120 db at .1hz is my guess.
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Old 11th October 2014, 06:57 PM   #4
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200dB is LOUD. Might be doable with a Saturn 5 main engine as a subwoofer.
https://www.youtube.com/watch?v=d0-DEtKcsjg

Or for more slam, try one of these.
https://www.youtube.com/watch?v=S1f6vbiuUt0

The biggest sub I know of is this one.
ROYAL DEVICE Hi-Efficiency Loudspeakers Audiophile speaker systems High fidelity systems Sistemi di altoparlanti hi-end HiFi ed Alta Efficienza Lautsprecher Diffusori acustici stereo Enceintes acoustiques
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Old 11th October 2014, 07:09 PM   #5
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Quote:
Originally Posted by sine143 View Post
Build concrete bunker with 20 foot thick walls and ceilings (only needs to be big enough for the subwoofer boxes (1700 cubic feet) and the listener).

install 5000 amp 3phase 240v electrical service.

order 256 18 sound lms ultras, stuff em in six cubic fet sealed a piece.

Order enough amps to be capable of around 1000kw of output

Add massive amounts of boost down low.

... and you are still not anywhere near 120 db at .1hz is my guess.
That is exactly what I also thought. ...So why mentioned it then?
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Old 11th October 2014, 07:11 PM   #6
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Quote:
Originally Posted by zobsky View Post
I appreciate your humor, and I love movies with a passion.

Thx for your best effort but no thx.
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Old 11th October 2014, 07:15 PM   #7
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Now we're talking! ...That is exactly what I'm asking for; real true science, so that I can learn something positively good.

You sir, are on the perfect direction in the search for the ultimate bad *** subwoofer of our entire planet; just like me.

This is the first intelligent reply to my request (quest). ...Thank you.
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Old 11th October 2014, 07:19 PM   #8
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With your help, scopeboy, I found this:

IL PIU' GRANDE SUBWOOFER DEL MONDO - by Roberto Delle Curti - Italy
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Old 11th October 2014, 07:23 PM   #9
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...It's a long article, with several pictures, so keep scrolling down, and read it all.
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Old 11th October 2014, 07:24 PM   #10
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Quote:
and that man would be able to survive, if installed in a home?
This is where it gets problematic... See the following list for a guide to SPLs and the survivability thereof.
Decibel Equivalent Table (whats how loud) | Decibel Car Audio the SPL Knowledgebase
Highlights:
145dB Vision blurs due to eyeball vibration
195dB Human eardrums rupture
202dB Death from sound wave
215dB Space shuttle launches
248dB Atomic bombs
310dB Krakatau volcanic eruption 1883. Cracked one foot thick concrete at 300 miles
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