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Car Audio Help
Enclosure Design & Construction
4 cubic feet, tuned to 22 Hz, port area >= 64in^2
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<blockquote data-quote="emilimo701" data-source="post: 7778941" data-attributes="member: 622834"><p>I'm tuning at 22 Hz based on the specs of the sub, and what I want to get out of the system. I can hear the 20 Hz tone in "Put On" by young jeezy and kanye, so i'm kind of using that as my reference. Right now with the Axis in a sealed box, i'm not getting the output I want. It's about 16db down at 20Hz, and that simply is not cutting it. I want that 20Hz tone to slam with the same authority as the others. If I find out that such a lot tuning isn't necessary, I'll rebuild a new box tuned higher. But right now my goal for the enclosure is firm: 4-4.2 cubic feet tuned to 22Hz. I don't so much want high SPL in the 40-50 Hz range; rather, <strong>a flat response with a graceful rolloff</strong>. Maybe I won't end up liking it, but I want to at least give it a try, for curiosity's sake if not anything else.</p><p></p><p>I've done the simulations in WinISD, and have used another online resource that has corroborated the measurements of WinISD.</p><p></p><p></p><p>Right, I have seen recommendations that a rectangular port should not have a ratio higher than 1:8 and have even seen 1:5 as the max. The design I have right now is one rectangular port: 16" x 4". The annoying thing is that it wraps almost all the way around the box, unless I want to incorporate 180 degree turns into the port design.</p><p></p><p>The benefit to using dual slotted ports (besides the aesthetics) would be that I would be able to locate the wire terminals conveniently in the back of the box without have to route them through the port space. Also, this would mean that the subwoofer would be able to be front-facing and centered.</p><p></p><p>I was thinking of decreasing the height of the box and going with a <strong>15.5" x 2.25" port on each side</strong>. Eh?</p></blockquote><p></p>
[QUOTE="emilimo701, post: 7778941, member: 622834"] I'm tuning at 22 Hz based on the specs of the sub, and what I want to get out of the system. I can hear the 20 Hz tone in "Put On" by young jeezy and kanye, so i'm kind of using that as my reference. Right now with the Axis in a sealed box, i'm not getting the output I want. It's about 16db down at 20Hz, and that simply is not cutting it. I want that 20Hz tone to slam with the same authority as the others. If I find out that such a lot tuning isn't necessary, I'll rebuild a new box tuned higher. But right now my goal for the enclosure is firm: 4-4.2 cubic feet tuned to 22Hz. I don't so much want high SPL in the 40-50 Hz range; rather, [B]a flat response with a graceful rolloff[/B]. Maybe I won't end up liking it, but I want to at least give it a try, for curiosity's sake if not anything else. I've done the simulations in WinISD, and have used another online resource that has corroborated the measurements of WinISD. Right, I have seen recommendations that a rectangular port should not have a ratio higher than 1:8 and have even seen 1:5 as the max. The design I have right now is one rectangular port: 16" x 4". The annoying thing is that it wraps almost all the way around the box, unless I want to incorporate 180 degree turns into the port design. The benefit to using dual slotted ports (besides the aesthetics) would be that I would be able to locate the wire terminals conveniently in the back of the box without have to route them through the port space. Also, this would mean that the subwoofer would be able to be front-facing and centered. I was thinking of decreasing the height of the box and going with a [B]15.5" x 2.25" port on each side[/B]. Eh? [/QUOTE]
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4 cubic feet, tuned to 22 Hz, port area >= 64in^2
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