"Sounds" like Much more fun ! Tried it once, but 2 is better
Two bad; you're normal.
Hi NorthStar,
How about this system:
http://www.diyaudio.com/forums/subwoofers/261765-25-600w-wall-bass-using-32x-15s.html
Regards,
How about this system:
http://www.diyaudio.com/forums/subwoofers/261765-25-600w-wall-bass-using-32x-15s.html
Regards,
Ok, it's a discotheque. ...Should we explore all avenues, including live stadium music concerts?
...Like when the Rolling Stones, or Pink Floyd, or Metallica perform live @ stadium venues.
...With 100,000 people in the audience.
I would like to stick with a home sound system; that way one can survive with 300 decibels plus inside his own home.
But this is an open thread, so everything goes, including the kitchen sink.
...Like when the Rolling Stones, or Pink Floyd, or Metallica perform live @ stadium venues.
...With 100,000 people in the audience.
I would like to stick with a home sound system; that way one can survive with 300 decibels plus inside his own home.
But this is an open thread, so everything goes, including the kitchen sink.
170dB friction in air can light a cigarette
191dB 1 lb. bomb or grenade at blast epicentre
202dB Death from sound wave (shock) alone.
213dB Sonic boom generates approximately 1.2 gigawatts power equivalent
248dB Atomic bombs dropped on Hiroshima and Nagasaki, Japan, August 6th & 9th, 1945. Total disintegration of 16 square miles, wind was around 300 miles per hour, destroyed 28” thick concrete walls at 1 mile distance. Leaving a crater 633 feet wide and 80 feet deep.
310dB Krakatau volcanic eruption 1883. Cracked one foot thick concrete at 300 miles, created a 3000 foot tidal wave, and heard 3100 miles away, sound pressure caused barometers to fluctuate wildly at 100 miles indicating levels of 190db at that distance from blast site. Rocks thrown to a height of 34 miles.
191dB 1 lb. bomb or grenade at blast epicentre
202dB Death from sound wave (shock) alone.
213dB Sonic boom generates approximately 1.2 gigawatts power equivalent
248dB Atomic bombs dropped on Hiroshima and Nagasaki, Japan, August 6th & 9th, 1945. Total disintegration of 16 square miles, wind was around 300 miles per hour, destroyed 28” thick concrete walls at 1 mile distance. Leaving a crater 633 feet wide and 80 feet deep.
310dB Krakatau volcanic eruption 1883. Cracked one foot thick concrete at 300 miles, created a 3000 foot tidal wave, and heard 3100 miles away, sound pressure caused barometers to fluctuate wildly at 100 miles indicating levels of 190db at that distance from blast site. Rocks thrown to a height of 34 miles.
Hi NorthStar,
Here is a system by Marcel Roggero, in very general terms a similar approach as in Post #62. Front has 2 x 8ea. 515 driver bass horns, and rear has a 1m thick absorber.
Again, you can scale it to suit (e.g.: 24 drivers per horn, now that might be loud) . Needs lots of concrete though.
Regards,
Here is a system by Marcel Roggero, in very general terms a similar approach as in Post #62. Front has 2 x 8ea. 515 driver bass horns, and rear has a 1m thick absorber.
Again, you can scale it to suit (e.g.: 24 drivers per horn, now that might be loud)
. Needs lots of concrete though.Regards,
Attachments
Just checking the math here... 10*log(1.21e9) + 112 = 202.8
Are you saying that the sonic boom is only 10% efficient? 213 dB is 12GW acoustic power. Makes you wonder about that 1.21 GW - if all of it were converted into sound it would kill you. Doc's guitar amp/speaker wasn't really all that loud when it blew - made more noise from the hum pickup.
Might be fun to build a horn sub that could light a cigarette - if it were placed in the throat we might get there. Maybe not at 20 Hz, but 70 or 80....
Ok, I'm with ya on that.
Hi NorthStar,
Here is a system by Marcel Roggero, in very general terms a similar approach as in Post #62. Front has 2 x 8ea. 515 driver bass horns, and rear has a 1m thick absorber.
Again, you can scale it to suit (e.g.: 24 drivers per horn, now that might be loud)
Regards,
Nice, very nice; thx for sharing.
That's where Godzilla, in movies, is coming from; from which he was first created on our screens. ...Amazing that he is still alive today and that we was not banned by the moderators of the United States of America.
P.S. By the way, Oscar Pistorious got off easy. ...But then, over there it ain't the USA, but Johannesburg. ...Much more clement town. The judge has a fairly broad view of the all situation.
Oscar will be back, making money again, and with a new girlfriend. That's life man.
And Godzilla will rise again, and even more powerful with a roar that can reach up to 400 decibels; then watch out if you are in its wave of operation.
Question: We all know that 120dB will damage our hearing if over say an hour.
What about 121dB @ anywhere from 5Hz to 50Hz and for about 61 minutes?
And! 130dB+ (140) @ 10-20Hz for about thirty minutes?
What is reasonable; in high sound pressure (number of decibels), and @ what frequencies (anywhere from 1Hz to 100kHz), and for how long (time period before we completely lose our brain and our mojo)? ...Our hearing included, of course.
What about 121dB @ anywhere from 5Hz to 50Hz and for about 61 minutes?
And! 130dB+ (140) @ 10-20Hz for about thirty minutes?
What is reasonable; in high sound pressure (number of decibels), and @ what frequencies (anywhere from 1Hz to 100kHz), and for how long (time period before we completely lose our brain and our mojo)? ...Our hearing included, of course.
You want 0.1Hz? Build a concrete tube - a thick one - and close it off at both ends by moveable but tightly fitting walls. Actuate said walls with hydraulic pistons on a 10second cycle. Boom. There's your 0.1Hz at high decibel levels. The trick is not letting air escape. Conventional audio tech won't work this low.
The supermassive black hole has such a negative pressure that it is swallowing the galaxy, very slowly. When its done, it will slowly radiate away during some trillion years or so. That is a pretty powerful "soundwave". It starts with a very sharp transient, the supernova creating the black hole. Then the pressure gets lower and lower, the negative part of the soundwave, and it starts absorbing a galaxy or two.
I dont have a clue about how many dB that kind of energy would be, but it is a waveshape with a pretty low frequency..
Johannes
I dont have a clue about how many dB that kind of energy would be, but it is a waveshape with a pretty low frequency..
Johannes
If you want to start building a powerful loudspeaker you have to use a powerful magnet:
Anniversary of a cosmic blast - Bad Astronomy | DiscoverMagazine.com : Bad Astronomy
Anniversary of a cosmic blast - Bad Astronomy | DiscoverMagazine.com : Bad Astronomy
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.