The simple sealed box of the dimensions you provided loaded with one Stereo Integrity HST-18 woofer could put out 97dB SPL at 8Hz, 109 dB at 16 Hz at one meter. This is likely much louder than Gavreau's noisy ductwork.
A pipe based device would require far more physical space than 126 liters to achieve the same SPL as the sealed box, so forget about it, unless you get a bigger car 😉
Correct, this (very) expensive driver in a single ~100 L sealed box/suitcase has enough power handling (piston displacement (area * Xmax)) to offset the need for a large, long pipe for only 80 dB/10 Hz/m and only need a small amp to drive it (23 W min.), though just a simulation based on available specs, so recommend at least +6 dB/~100 W.
The gas of choice is sulfer hexafloride. It will give you an apparently larger box. You have to figure how to keep the gas in. Dayton-Wright used it in his ESLs and later in his dynamic loudspeakers.
dave
Trouble being that Sulphur Hexaflouride is an extremely potent greenhouse gas, much more so than Methane even and extremely long lived in the environment.
Is the 32inch Clarion driver still around, with processing wasn't that a capable ELF driver is a very small box?
Small that is for the sheer size of a 32inch woofer
Is the 32inch Clarion driver still around, with processing wasn't that a capable ELF driver is a very small box?
Small that is for the sheer size of a 32inch woofer
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What if you super cooled the air inside to make it denser. Begs the question, if heat from the driver heats up the air inside a loud speaker cabinet, does it screw up all the design parameters, bit I guess the temp required to make a lick of difference would be well hot.
no anyway for me that price is too high. could you find another cheaper solution around $ 100-150? I had thought of a compressor that loads the air into a box and compresses it and then releases the compressed air into the bass reflex. or as you said to use bus horns, in short, a less expensive solution
no anyway for me that price is too high. could you find another cheaper solution around $ 100-150? I had thought of a compressor that loads the air into a box and compresses it and then releases the compressed air into the bass reflex. or as you said to use bus horns, in short, a less expensive solution
The OP (Elonmuss) specified maximum dimensions must be: height = 70 cm, depth = 40 cm and width = 45 cm (126 liter gross).
32" is 81.28 centimeters.
The Clarion SRW8000 would burn out with sustained use of it's 13.8mm Xmax in a 126 liter box, it needs in the >600Liter range.
Air pressure (AKA barometric pressure) normally can vary from 980 millibars which equals 14.21 pounds per square inch to 1050mb, which is 15.23psi, a net difference of 1.02psi.
A 15" woofer has around 133 square inches of cone area, 133 x 1.02= 135.66 pounds, assuming you seal the cabinet in the middle of the range, there is still about a 68 pound pressure swing that can be expected, more with extreme storm conditions which seem to be happening with more frequency.
68 pounds of pressure on the cone would offset the coil rearward or forward, reducing linear excursion.
Good reasons why "sealed" cabinets are seldom designed to be "air (or specialized gas) tight".
Nobody suggested a bus horn.
For $150 you may be able to make a compressed air fart generator (générateur de pets), but I'm not interested in designing one 💩.
Hmm, this is 62.9 L net, so folded with flanges to join the two in dual 45 L suitcases seems reasonable, but this presumes an air pump like used in a church organ, which AFAIK there's no point source driver nor any speaker passive radiator I'm aware of can do 10 Hz at even a super low 80 dB peak SPL nor can be sufficiently air driven except maybe with a compressor, though even if there are it seems reasonable that it all won't fit in two suitcases nor @ anywhere near $100-150, so time for me to follow Art 'out the door'. 🙁
Bass comes down to moving air, so the best value might be a large number of cheap car subwoofers in an infinite baffle. Perhaps replace the door to the listening room with a baffle. If mounting subs directly to the door isn't enough, arrange them in a 3D "manifold" design (google manifold subwoofers).
GM is on the money there, bass costs; infrabass costs more, much more.
So unless you're willing to spend a several thousand dollars forget about infrabass at any reasonable SPL
In addition you'd need an amplifier without the usual crowbar protection at 16 or 25Hz
So unless you're willing to spend a several thousand dollars forget about infrabass at any reasonable SPL
In addition you'd need an amplifier without the usual crowbar protection at 16 or 25Hz
so assuming that the dimensions of the cabinet are always the same, you can do something maybe by increasing the frequency to 18-19 hz and a lower SPL like 60 Db? would this be more feasible?
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so this could be the idea of the line array, and that is to insert many drivers in such a way as to increase the surface of the room, it would be feasible as already said before always keeping the dimensions of the cabinet the same and perhaps increasing the frequency to 18 hz and a 60 Db SPL?
Maybe a half dozen $150- subs mounted in the roof cavity?
Not a realistic thought experiment, you simply won't hear it or perhaps not even feel it.
Ever been in an earthquake?
Not a realistic thought experiment, you simply won't hear it or perhaps not even feel it.
Ever been in an earthquake?
well I just want to know if the bass reflex with a maximum of 126 liters of volume can generate infrasound with a maximum frequency of 18 hz and an acceptable SPL for 1 meter away but if this is not possible for obvious reasons then I switch to infrasound tube as already Gavreau's experiments and organ pipes, because it seems to me more feasible obviously contained and wrapped in a volume of 126 liters, so you tell me whether to continue with the bass reflex or switch to the tube
Short answer is obviously no.
NO
Not even close and we aren't going to make decisions for you. That's DIY in a nutshell, make and see and if you fail try again with something else.
NO
Not even close and we aren't going to make decisions for you. That's DIY in a nutshell, make and see and if you fail try again with something else.
no obviously I don't want you to do the whole project for me but I just want to know how to do it. so if with the bass reflex there is no way out then I go to the tube, maybe if you can tell me the dimensions and some tricks for the construction for the rest I do it by myself, that's all
sorry guys I would like to finish quickly so I made some approximate calculations of the dimensions of the folded tube the 126 liters, and from the results I came out 6.5 meters in length and 20 cm in width do you think they are enough? I also wrote a private message to a colleague