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Enclosure Design & Construction
Twin Sundown SA6.5 SW D2 32Hz Ported 0.6ft3 in Ford Escape Box Build
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<blockquote data-quote="imsickofweed" data-source="post: 8644128" data-attributes="member: 668971"><p>Man, this box design is getting way out of hand, lol. I studied up a little more on the PR and have decided against it, the disadvantages over ported start to amplify the closer it gets to 0.5 Qts, these subs are at 0.46 Qts. My box is on the long side at 21” built with true 1/2” birch giving me 19” of port length on the top plus another 3/4” rounding the tip of a single board and giving me roughly 0.6-0.63 internal net volume. That length of port tunes the box to 36-37Hz depending on where it winds up at between 0.6-0.63. Ive also read a few threads about the X6.5s because theres not much out there on the SA6.5 and theyre very close in T/S parameters just mainly a difference in power handling. During the X6.5 design process they modeled the best box (opinion of sundown test and design team) to 32Hz. Their graphs show a similar curve to the one shredder did towards the beginning of the thread and I originally thought that would be a decent frequency response curve but wouldnt get much box gain for my trouble. My comprimise is going to be the middle of the road and the design that makes it easiest for me to modify the box up or down on port length. The single board making the slotted port can be cut down with a compact router using an offset base or an orbital cutoff tool from the speaker hole or a piece can be added to extend it down the wall from the speaker hole.</p><p></p><p>A 3” PVC pipe flared with a heat gun also looks promising for ease of adjustment, but its a little smaller diameter than what 8cuin works out to be (3.2” diameter). This shortens the port length for round ports, but is still longer for that particular frequency than the slotted port and Id have to have a bend in there somewhere.</p></blockquote><p></p>
[QUOTE="imsickofweed, post: 8644128, member: 668971"] Man, this box design is getting way out of hand, lol. I studied up a little more on the PR and have decided against it, the disadvantages over ported start to amplify the closer it gets to 0.5 Qts, these subs are at 0.46 Qts. My box is on the long side at 21” built with true 1/2” birch giving me 19” of port length on the top plus another 3/4” rounding the tip of a single board and giving me roughly 0.6-0.63 internal net volume. That length of port tunes the box to 36-37Hz depending on where it winds up at between 0.6-0.63. Ive also read a few threads about the X6.5s because theres not much out there on the SA6.5 and theyre very close in T/S parameters just mainly a difference in power handling. During the X6.5 design process they modeled the best box (opinion of sundown test and design team) to 32Hz. Their graphs show a similar curve to the one shredder did towards the beginning of the thread and I originally thought that would be a decent frequency response curve but wouldnt get much box gain for my trouble. My comprimise is going to be the middle of the road and the design that makes it easiest for me to modify the box up or down on port length. The single board making the slotted port can be cut down with a compact router using an offset base or an orbital cutoff tool from the speaker hole or a piece can be added to extend it down the wall from the speaker hole. A 3” PVC pipe flared with a heat gun also looks promising for ease of adjustment, but its a little smaller diameter than what 8cuin works out to be (3.2” diameter). This shortens the port length for round ports, but is still longer for that particular frequency than the slotted port and Id have to have a bend in there somewhere. [/QUOTE]
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Twin Sundown SA6.5 SW D2 32Hz Ported 0.6ft3 in Ford Escape Box Build
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