I want to add that isn't a 3-way's bass chamber just a pressure chamber?
There won't be any standing waves or reflections because of the long wavelength, just pressure variations. And especially a closed chamber must be rigid against ballooning. A spherical or cylindrical form would be optimal (think about gas tanks)
There won't be any standing waves or reflections because of the long wavelength, just pressure variations. And especially a closed chamber must be rigid against ballooning. A spherical or cylindrical form would be optimal (think about gas tanks)
Yes, you are right, about the presence of standing waves ( they don't exist inside a little small box, but many here insist of telling so ) and that inside a box there is no sound ( that's another long argument...but also very simple: sound- musical sound- forms in the brain ) but just swirls, chaotic pressure.
Do you guys think that somehow a speaker driver cone that vibrates and generates (air) pressure variations, that are perceived as sound in front of the cone (outside the enclosure), somehow doesn't vibrate and generate pressure variations at the back side of the cone as well (inside the enclosure)? come on 
Sure enough everyone can debate if the pressure variations inside the enclosure are transferred through the walls or cone (sound can travel in any medium) or affect the driver / amplifier electro-mechanical acoustical system somehow. Thats why everyone should experiment at home and decide what is meaning full and worth the effort with an enclosure for a given application. I'm out
Sure enough everyone can debate if the pressure variations inside the enclosure are transferred through the walls or cone (sound can travel in any medium) or affect the driver / amplifier electro-mechanical acoustical system somehow. Thats why everyone should experiment at home and decide what is meaning full and worth the effort with an enclosure for a given application. I'm out
The story that there's no sound inside of the cabinets is bull poop. Then what would be the point of a cabinet in the first place???
I will obviously experiment with the amount and layout of the damping. Right now I just want to know what is the best material and principle to start with.
About the CLD. If I understand it right, it's constructing the walls out of multiple layers and put damping adhesives in-between. like for example with the latest Q-Acoustics Concept series. I don't doubt it has its strengths and advantages but this makes the construction a whole lot more complicated and everything has to be reconsidered and fine tuned. The different materials and stiffnesses for the panels of each layer, the adhesives used, the thicknesses and everything has to line up correctly to get the right damping and resonant frequencies. All very complicated and requires a lot of prototyping and fine tuning. And though I know prototyping and fine tuning is one of the standard stages when developing a product, I want to avoid that. It takes way too much time and money, even if I where to just make small prototypes for a single driver. And still, when I know what specifications I will need, all these multiple layers are very complicated for construction.
For this project I'm just gonna go the way I'm going right now. Make the cabinet itself as rigid, inert and dead as possible so it won't resonate or vibrate in the first place and won't need vibration damping. And only have to worry about the acoustic internal damping.
I will obviously experiment with the amount and layout of the damping. Right now I just want to know what is the best material and principle to start with.
About the CLD. If I understand it right, it's constructing the walls out of multiple layers and put damping adhesives in-between. like for example with the latest Q-Acoustics Concept series. I don't doubt it has its strengths and advantages but this makes the construction a whole lot more complicated and everything has to be reconsidered and fine tuned. The different materials and stiffnesses for the panels of each layer, the adhesives used, the thicknesses and everything has to line up correctly to get the right damping and resonant frequencies. All very complicated and requires a lot of prototyping and fine tuning. And though I know prototyping and fine tuning is one of the standard stages when developing a product, I want to avoid that. It takes way too much time and money, even if I where to just make small prototypes for a single driver. And still, when I know what specifications I will need, all these multiple layers are very complicated for construction.
For this project I'm just gonna go the way I'm going right now. Make the cabinet itself as rigid, inert and dead as possible so it won't resonate or vibrate in the first place and won't need vibration damping. And only have to worry about the acoustic internal damping.
About amps: Thinking quickly, one should put plate amp into its own compartment and not in the same enclosed volume as woofers are. Negatives not using own compartment might be: pressure leakage from the box , temperature shared between the driver and amp affecting electronic parameters of both, possible mechanical vibration of amplifier components leading to early failures. If the amp is designed to be used like so, why not. If it is a no compromise speaker, use compartment or external enclosure for the amp.
, temperature shared between the driver and amp affecting electronic parameters of both, possible mechanical vibration of amplifier components leading to early failures. If the amp is designed to be used like so, why not. If it is a no compromise speaker, use compartment or external enclosure for the amp.
Maybe think and make sure it isn't nonsense before you say something. First of all these are plate ams designed to be mounted in the speaker cabinet, that's kind of the entire point of a plate amplifier. Though obviously it isn't designed to be part of the outer wall of the cabinet, it has vents in it, and obviously isn't any rigid. Which is why I put it in its own chamber. I think this was pretty obvious already because I think I probably mentioned the "amplifier chamber" before in this thread and I think it's pretty self-explanatory it should be in it's own chamber anyway. It has literally been in the design from the start.
Come on, do you think I'm stupid? I graduated literally yesterday.
Come on, do you think I'm stupid? I graduated literally yesterday.
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Fully aware what plate amps are and that you had a compartment, sorry if you felt offended I didn't mean to offend. Anyway, I've got impression from the thread you haven't read that much about cabinets so thought that you are in need of comments about amps if they were contained in the speaker box, regarding the post by picowallspeaker "Same for the electronics contained in the speaker box". I'm out carry on
carry on
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Well, the amplifiers already are in their own very stiff sealed compartment. And in the bottom. For vibration/rocking of the cabinet, the middle of where it sits on the floor is the pivot point, so the closer you get to the floor, the smaller the amplitude of the already nearly non-existent vibrations gets. So at the bottom, vibrations are minimized even much further to practically zero. I could also use foam tape around the edges of the amps to further isolate them from the vibrations. So I'm not worried about them picking up vibrations. These Hypex class D FusionAmps already are very resistant to microphonics of themselves, part of the reason for this is because they are designed as plate amps, and they're just brilliant anyway.
Argh, sorry about it again, I don't mean to offend, don't get offended. Expressing myself in English is not a strong point.
Most of the recent discussion in this thread contains important buzz words regarding cabinet design, such as damping, stiffness, mass, resonances etc. which there is a lot of resource material available on the web. Sometimes I find it difficult to find the right information I'm looking for, kinda don't know about what to search for to get answer to a specific question. After a bit searching around I'll have better understanding what to search to get relevant content to read. Then starts the process of reading all the material and try to figure out whats right and what is false information, getting to the bottom of things is a lot of work but everyone who wants to really learn has to do it on their own. In addition to reading I make prototypes since that is the only way I know how to learn what is in the grey area between the black-and-white information on the web.
My motivation for posting in this forum is to learn myself and when I think I got enough knowledge to post a meaning full comment to help other people to find their own way to get the answers they are after I'll do it. It doesn't mean that people find my comments meaning full though, its their own process they are going through. Considering my expression skills, I've got a lot to learn to get the correct message delivered.
Most of the recent discussion in this thread contains important buzz words regarding cabinet design, such as damping, stiffness, mass, resonances etc. which there is a lot of resource material available on the web. Sometimes I find it difficult to find the right information I'm looking for, kinda don't know about what to search for to get answer to a specific question. After a bit searching around I'll have better understanding what to search to get relevant content to read. Then starts the process of reading all the material and try to figure out whats right and what is false information, getting to the bottom of things is a lot of work but everyone who wants to really learn has to do it on their own. In addition to reading I make prototypes since that is the only way I know how to learn what is in the grey area between the black-and-white information on the web.
My motivation for posting in this forum is to learn myself and when I think I got enough knowledge to post a meaning full comment to help other people to find their own way to get the answers they are after I'll do it. It doesn't mean that people find my comments meaning full though, its their own process they are going through. Considering my expression skills, I've got a lot to learn to get the correct message delivered.
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Like my mum said to me when I wanted to get a motorcycle license. It's not you I don't trust, it's some of the other drivers. There is quite a lot of experience amongst those on this thread.
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