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wall question for pros
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<blockquote data-quote="Moble Enclosurs" data-source="post: 7457988" data-attributes="member: 634917"><p>Due to the amount of pressure that will be caused in such a small acoustical environment, with 8 12s, unless you are concerned with actual spl numbers, will be sufficient in any design properly made. But the ratio of the cabin area with the subs acoustical chamber has to be calculated together for an overall response of the design. This is actually true with any design. If you consider a ported design, it is actually going to act like a bandpass anyhow, but since the environment is so acoustically small compared to the power and compression it will be given, a smooth response will be likely in any position of the vehicle in this case. Yes, vehicle resonances will exist, but with that much reverberation and reflection from the vehicles properties in relation to the subs acoustical chamber properties, it will sound likely no different than actually sticking your head inside an enclosure, which you will notice if this is done, that the response curve does become flat...audibly anyhow.</p><p></p><p>So, not so much emphasis on phase direction and loading of a specific position should be considered rather than finding the coupling of the enclosure and the vehicle by calculating it as a quasi design. So, two ways about going with this....I'm not going to tell exactly how, because this is something I have figured myself and gives me the reason to do what I do, but like mentioned, one of those ways is to figure for a quasi 4th, if your using a slot ported design, and calculate the front cabin area(what is left) as a ported acoustical compression chamber for the enclosure design. This should give you a good idea of what it will do. Using a 6th order as a wall can be calculated as an 8th order BP as well. Again, when doing wall design, considering the cabin as a compression area of the design is very important to get the ratio of chambers correct.</p><p></p><p>Does that help at all? If not, I can do the design for you if you like.</p><p></p><p>As far as the scattering of sound everywhere but your ears, no, it will scatter like that, but will include any listening position as well, with max power levels. The lower the volume, the more you will begin to notice the resonances though, if you are concerned about musical output as well.</p><p></p><p>Just some thoughts.</p></blockquote><p></p>
[QUOTE="Moble Enclosurs, post: 7457988, member: 634917"] Due to the amount of pressure that will be caused in such a small acoustical environment, with 8 12s, unless you are concerned with actual spl numbers, will be sufficient in any design properly made. But the ratio of the cabin area with the subs acoustical chamber has to be calculated together for an overall response of the design. This is actually true with any design. If you consider a ported design, it is actually going to act like a bandpass anyhow, but since the environment is so acoustically small compared to the power and compression it will be given, a smooth response will be likely in any position of the vehicle in this case. Yes, vehicle resonances will exist, but with that much reverberation and reflection from the vehicles properties in relation to the subs acoustical chamber properties, it will sound likely no different than actually sticking your head inside an enclosure, which you will notice if this is done, that the response curve does become flat...audibly anyhow. So, not so much emphasis on phase direction and loading of a specific position should be considered rather than finding the coupling of the enclosure and the vehicle by calculating it as a quasi design. So, two ways about going with this....I'm not going to tell exactly how, because this is something I have figured myself and gives me the reason to do what I do, but like mentioned, one of those ways is to figure for a quasi 4th, if your using a slot ported design, and calculate the front cabin area(what is left) as a ported acoustical compression chamber for the enclosure design. This should give you a good idea of what it will do. Using a 6th order as a wall can be calculated as an 8th order BP as well. Again, when doing wall design, considering the cabin as a compression area of the design is very important to get the ratio of chambers correct. Does that help at all? If not, I can do the design for you if you like. As far as the scattering of sound everywhere but your ears, no, it will scatter like that, but will include any listening position as well, with max power levels. The lower the volume, the more you will begin to notice the resonances though, if you are concerned about musical output as well. Just some thoughts. [/QUOTE]
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