Re: Late? quit making sense!
daddy likes 🙂
I can live with electronically flattening it out ....
mwmkravchenko said:
Cloth Ears said:
daddy likes 🙂
I can live with electronically flattening it out ....
Re: Late? quit making sense!
4th order bandpass correct???
JI can't seem to make this actually fuction very well
mwmkravchenko said:
4th order bandpass correct???
JI can't seem to make this actually fuction very well
I'm thinking a Linkwitz Transform filter for a crapload of high-power, high-excursion subs would do it. Don't feel like doing any calculations, though.
130 dB at very low frequencies are not that dangerous for hearing. It could be dangerous for health I don't know. I should bring my SPL meter in a club someday. I'm quite sure the SPL is stupidly high in the 120s...
I will use these Titanics since you seem to want to use them.
I will use these Titanics since you seem to want to use them.
454Casull said:
It would work, but he only have 2400W to work with, so ported is the way to go.
mwmkravchenko, according to Adire, room gain is more like 2 dB per octave for the usual room. I built a subwoofer using that rule of thumb and it was flat in room down to 16 Hz as designed when measured with a RadioShack SPL meter.
simon5 said:
I just can't think of a woofer to buy that can do this....
the tumult isn't out nor is the maelstorm...
I can get RE to build me a "special" MT
Checked with the Titanic.
2 Titanic each in their 15 cu.ft boxes with 900W would do around 127 dB in room at 10 Hz. The rolloff is a bit higher than wanted, because you get 131 dB at 40 Hz.
I'll use the Acoustic Elegance AV15 in the next simulation, it's the same price for better performance.
2 Titanic each in their 15 cu.ft boxes with 900W would do around 127 dB in room at 10 Hz. The rolloff is a bit higher than wanted, because you get 131 dB at 40 Hz.
I'll use the Acoustic Elegance AV15 in the next simulation, it's the same price for better performance.
I'd have to do a bit of research, but I thought that sub-hearing sounds at 125-130dB can have the same effect as someone slapping their hands over your ears - it can rupture the ear-drums. I'm not sure that it will deafen you, but will cause problems with your ears which can be the same thing.
From a quick scan, the following are the 'health' regulations:
Continuous dB Permissible Exposure Time
85 db 8 hours
88 dB 4 hours
91 db 2 hours
94 db 1 hour
97 db 30 minutes
100 db 15 minutes
103 db 7.5 minutes
106 dB 3.75 min (< 4min)
109 dB 1.875 min (< 2min)
112 dB .9375 min (~1 min)
115 dB .46875 min (~30 sec)
I remember the "Mythbusters" doing a show on low frequencies - surrounding one of them with a stack of subbies and pumping sounds from 8-80 Hz at volumes from 100dB to 160dB. They got the dude to wear ear proctection after the first test at 100dB.
I did a quick calculation using a lt and the ascendant atlas 12" since thats what paramaters i had on hand. in 2 20cuft boxes with 5 12"s each and 2400 watts you can get 126db flat down to about 5hz in room... I would assume you could get something similar with other readily available drivers such as the av12 or the tc2+
This thread is reducilis...
you dont want 130db@10hz... 110db@10hz gets scary. You will probably break something(although it may have nothing to do with your stereo). Perhaps your eardrums.... Although I dont believe infrasound is as damaging to the ears as some suggest.
Dont say the REXXX18 wont do 10hz because it has a high Fs... Believe me... it will do 10hz just as well(if not better) than an old school adire tumult 15 which has a much lower Fs. Excursion, displacement, and cone area are all that matters below 20hz. Throw the rest out the window.
On the issue of room gain... Just like SPL competetion cars there is a point where the bass you blast into the walls stops coming back and starts getting transfered into other things... 130db Is above that point I do believe
you dont want 130db@10hz... 110db@10hz gets scary. You will probably break something(although it may have nothing to do with your stereo). Perhaps your eardrums.... Although I dont believe infrasound is as damaging to the ears as some suggest.
Dont say the REXXX18 wont do 10hz because it has a high Fs... Believe me... it will do 10hz just as well(if not better) than an old school adire tumult 15 which has a much lower Fs. Excursion, displacement, and cone area are all that matters below 20hz. Throw the rest out the window.
On the issue of room gain... Just like SPL competetion cars there is a point where the bass you blast into the walls stops coming back and starts getting transfered into other things... 130db Is above that point I do believe
You're right, with a LT you can do anything. You didn't check the power needed to achieve that kind of performance I think. It would also bring the woofer in overexcursion and/or melt with 10 kW or so hehehe!
I also checked the AV15 BTW. They will not work according to WinISD. The Titanics are better for going down to 10 Hz.
Better drivers are the older Tumults. I'll check for other alternatives.
Best I could achieve yet is with 4 Ascendant Audio Avalanche 15. 4 boxes of 12.5 cu.ft each will give 129 dB at 10 Hz and 132 dB at 40 Hz with 1750W.
I think you'll need to wait for the new Tumults.
I saw that you set the challenge considerably lower. 125 dB flat down to 15 Hz, that's easy. If you want to go that way, tell me hehe!
I also checked the AV15 BTW. They will not work according to WinISD. The Titanics are better for going down to 10 Hz.
Better drivers are the older Tumults. I'll check for other alternatives.
Best I could achieve yet is with 4 Ascendant Audio Avalanche 15. 4 boxes of 12.5 cu.ft each will give 129 dB at 10 Hz and 132 dB at 40 Hz with 1750W.
I think you'll need to wait for the new Tumults.
I saw that you set the challenge considerably lower. 125 dB flat down to 15 Hz, that's easy. If you want to go that way, tell me hehe!
BassAwdyO said:
why is it ridiculous?
seems like a lofty but acheivable goal here
if I have to wait for a pair of the new tumults that gives me time to save the money lol
I like the 4 15" AV's
and yes Simon I can live with 120-125db from 10hz-40hz....
if it can be done in signifcantly less woofers/space
If this is to be used in a normal room in a living house, just way too ridiculous. You'll be killing yourself & your families while torturing your neighbors.
If this is only bragging about big numbers, or you're building an execution room, that's alright.
If this is only bragging about big numbers, or you're building an execution room, that's alright.
justinc said:
interesting.....
could say 2-3 AV15's do the same???
I can possbly up the wattage to say 4kw if absolutely necessary
CLS said:
I'm trying to find something that can keep up with my mains
with the same ridiculous SQ and SPL capabilites they have
I may not necessarily use it... but you never know....
this is actually in an apartment HAHAHA.... but my neighbors are cool as long as it's in the day
Still want that 10 Hz?
If you choose 15 Hz flat, that's easier.
10 Hz flat will need more than 20 cu.ft according to the drivers I used if you want 120+ dB.
Maybe the new Tumults will change that.
BTW, I'm still waiting for your reply in the Loudspeakers forum... hehe!
If you choose 15 Hz flat, that's easier.
10 Hz flat will need more than 20 cu.ft according to the drivers I used if you want 120+ dB.
Maybe the new Tumults will change that.
BTW, I'm still waiting for your reply in the Loudspeakers forum... hehe!
simon5 said:
I want 10 hz yea....
I'm very curious about this LT... I'm not opposed to employing one
10hz somewhat lower than perfectly flat is fine... as long as it can be equalized up (meaning excursion is low compared to 15hz here) so that I can match it for flat output at 120db without overexcursion 😉
no you would still need about 8 of them and more power or bigger boxes the problem with only 2-3 in a lt is that you will run out of excursion way too quickly at high power that low. you do realize that 120+ db at <20hz will probably cause structural damage especially in an apt that small
I do love those high performance pro drivers.
I got 6* 18" pro woofers in my system (2 on center, 2 on each mains). But what I like is the effortless they perform, not the vast SPL.
I took my millitary service in an airforce base. Those jet engine tests were really killing me. And those engines are "smallish ones" used on F5E, which is the smallest jetfighter's engine I've known. Even so, their sounds were more than enough to kill me, twice. I can't imagine the later bigger engines on F16 & Mirage2000.
In a normal & quiet environment, I doubt anyone would actully "need" an average SPL more than 100dB.
How do you like baby's crying? Quite annoying huh? That's slightly less then 100dB, around 94~96dB. It's really "more than enough".
If not, maybe the hearing needs check. And, the neighbors probably have already moved out? Or they might be wrapped in their cocoons which they "evolve" to be?
I got 6* 18" pro woofers in my system (2 on center, 2 on each mains). But what I like is the effortless they perform, not the vast SPL.
I took my millitary service in an airforce base. Those jet engine tests were really killing me. And those engines are "smallish ones" used on F5E, which is the smallest jetfighter's engine I've known. Even so, their sounds were more than enough to kill me, twice. I can't imagine the later bigger engines on F16 & Mirage2000.
In a normal & quiet environment, I doubt anyone would actully "need" an average SPL more than 100dB.
How do you like baby's crying? Quite annoying huh? That's slightly less then 100dB, around 94~96dB. It's really "more than enough".
If not, maybe the hearing needs check. And, the neighbors probably have already moved out? Or they might be wrapped in their cocoons which they "evolve" to be?
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