16 Ascendant Audio Avalanche 18's
1000W each
Mounted Infinite Baffle.
240dB at 10Hz if you only get 6dB of room gain. 🙂 At that level, I suspect you'll get more room gain.
About $18,000USD should get you there with some room to spare (amps and drivers).
C
1000W each
Mounted Infinite Baffle.
240dB at 10Hz if you only get 6dB of room gain. 🙂 At that level, I suspect you'll get more room gain.
About $18,000USD should get you there with some room to spare (amps and drivers).
C
Member
Joined 2003
It could be done with IB subs...and for less money and with lower power than you might think.
Not sure why you would want to do it...I've scared myself (figuratively) brown at lower levels than that!
Gemini subs
Not sure why you would want to do it...I've scared myself (figuratively) brown at lower levels than that!
Gemini subs
Here's the formula for max SPL in a sealed room, below the lowest mode frequency. It's taken from one of Siegfried Linkwitz's spreadsheets. Note, this formula assumes a solid and tightly sealed room. Think concrete bunker if you want 140dB. 😉
Closed room SPL at Xmax (Below lowest mode frequency)
196.9 - 3 + 20*LOG(C18*C19*0.0000001) - 20*LOG(R24)
C18 is woofer area in square cm
C19 is one-way Xmax in mm
R24 is room volume in cubic meters
Closed room SPL at Xmax (Below lowest mode frequency)
196.9 - 3 + 20*LOG(C18*C19*0.0000001) - 20*LOG(R24)
C18 is woofer area in square cm
C19 is one-way Xmax in mm
R24 is room volume in cubic meters
The formula above is the SPL anyplace in the room because you are pressurizing the whole thing. None of this puny 1 meter stuff. 😉
So, you'd need a mere 62 Avalanche 18s to do it in a 100 cubic meter room. But, in a 10 cubic meter van, 6 drivers would get you there quite nicely. 😉
So, you'd need a mere 62 Avalanche 18s to do it in a 100 cubic meter room. But, in a 10 cubic meter van, 6 drivers would get you there quite nicely. 😉
This is the response and pressure inside the box for a normal Peerless HDS164 in a BR box at 2.83 volts driving voltage. As you can see the pressure inside the box easily exceeds 140 dB at low frequencies.
So if your only goal is to acheive a high sound pressure for testing purposer, put the head inside the box (...or rather not😀 )
So if your only goal is to acheive a high sound pressure for testing purposer, put the head inside the box (...or rather not😀 )
An externally hosted image should be here but it was not working when we last tested it.
what good is infrasound if you cant use it on OTHER PEOPLE!!!
Really... The reaction of people when faced with infrasound is almost always some sort of panic, they wonder whats going on, some think its an earthquake.
I really want a device that can do some insane SPL at low frequency, and it can be done, so why arent I doing it, money. But soon I shall go to the hardware store and see what kind of parts I can find to engineer my design, and fit my budget!
My infrasound generator shall consist of, 2 pistons configured on a crankshaft similar to the boxter automotive engine, dual opposing, so that when one goes in. so does the other. The baffles would be perhaps 2'x2' apeice with maybe 1ft one way excursion at least.
The motor used will vary depending on the calculated power needed, but would likely be in the magnitude of 10hp
Now what I need to DIY is some way to make a GIANT surround to go around the baffles, so they can be mounted with the pistons, and crankshaft and motor inside a very LARGE vented enclosure. The enclosure, would of course be tuned to an extremely low frequency
The only other option might be to copy the auto engine further and use a piston that slides inside a cylinder and has ring gaskets that seal it airtight.
What do you all think?
Really... The reaction of people when faced with infrasound is almost always some sort of panic, they wonder whats going on, some think its an earthquake.
I really want a device that can do some insane SPL at low frequency, and it can be done, so why arent I doing it, money. But soon I shall go to the hardware store and see what kind of parts I can find to engineer my design, and fit my budget!
My infrasound generator shall consist of, 2 pistons configured on a crankshaft similar to the boxter automotive engine, dual opposing, so that when one goes in. so does the other. The baffles would be perhaps 2'x2' apeice with maybe 1ft one way excursion at least.
The motor used will vary depending on the calculated power needed, but would likely be in the magnitude of 10hp
Now what I need to DIY is some way to make a GIANT surround to go around the baffles, so they can be mounted with the pistons, and crankshaft and motor inside a very LARGE vented enclosure. The enclosure, would of course be tuned to an extremely low frequency
The only other option might be to copy the auto engine further and use a piston that slides inside a cylinder and has ring gaskets that seal it airtight.
What do you all think?
this reminds me...
haha...
i was reading an interview with some techno musician...
he was asked what the strangest thing that had ever happened was...i'll find the quite later...the site is down now...
but he said something to the effect of playing in a club and the bass was sooooo loud that a whole bunch of people there the runs...
so it looks like this thing could displace a lot more than air
haha...
i was reading an interview with some techno musician...
he was asked what the strangest thing that had ever happened was...i'll find the quite later...the site is down now...
but he said something to the effect of playing in a club and the bass was sooooo loud that a whole bunch of people there the runs...
so it looks like this thing could displace a lot more than air
Small room, many Tumults or a Parthenon in IB, pro audio amps, equalization.
Assuming 15dB of room gain, it'll take about 75858cc of displacement to make 140dB (at 1m, but I'm not sure if distance means much here). Each Tumult has 749cm^2 of surface area with (let's say) 50mm of clean p-p excursion. That's 3745 cc of displacement per Tumult. Approximately 20 Tumults are required. :O
Assuming 15dB of room gain, it'll take about 75858cc of displacement to make 140dB (at 1m, but I'm not sure if distance means much here). Each Tumult has 749cm^2 of surface area with (let's say) 50mm of clean p-p excursion. That's 3745 cc of displacement per Tumult. Approximately 20 Tumults are required. :O
See:
http://db.audioasylum.com/cgi/m.mpl?forum=hug&n=64664
Flow modulator - 133 dB at 2 meters down to 3 Hz in the example above. If you vented one side of a flow modulator into a room and the other to somewhere else, it could go to DC, as it could pump a steady flow of air into the room. You could also step up the flow and get more output. I was thinking about building one for a while and designed an acoustic lowpass to remove the fan noise, but it would have to be built into a house (very big).
http://db.audioasylum.com/cgi/m.mpl?forum=hug&n=64664
Flow modulator - 133 dB at 2 meters down to 3 Hz in the example above. If you vented one side of a flow modulator into a room and the other to somewhere else, it could go to DC, as it could pump a steady flow of air into the room. You could also step up the flow and get more output. I was thinking about building one for a while and designed an acoustic lowpass to remove the fan noise, but it would have to be built into a house (very big).
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