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Can you do a straight port with a 2" bend?
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<blockquote data-quote="Umbra" data-source="post: 8494549" data-attributes="member: 658055"><p>I thought the port area was just enough to prevent noise and seemed like a reasonable amount. If I'm way off, let me know.</p><p></p><p>You're right, it does lower tuning and it makes perfect sense if you think about it. I had a brain fart.</p><p></p><p>I hadn't considered a horn enclosure until you mentioned it. From my very brief research it sounds like they don't work well with low tunings and lots of power. I can't comment on the validity of those statements, but we went with a slot port because that's the design companies like JBL and Yamaha use, so there must be a reason. He wanted to build something comparable.</p><p></p><p>He dragged me out into the cold and we built something. It's not finished, but it's close. It reminds me of a front loading washing machine.</p><p></p><p><img src="http://uploads.tapatalk-cdn.com/20160411/b00584271904a5c208d54b03b20fd222.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>The holes on the sides are for handles and the holes in the back are for connectors.</p><p></p><p>The port doesn't have a division/brace down the middle; I just stuck that in there for assembly and drying. I could secure it, but I feel like that will reduce the port area and probably mess up the tuning. I was thinking of replacing it with a bolt or threaded rod for support. Thoughts?</p><p></p><p>I meant to put a 45 piece in the corner of the port, but forgot as the sun was setting. I can still glue one in there. Maybe also in the corner opposite it. Here's a crappy sketch to illustrate:</p><p></p><p><img src="http://uploads.tapatalk-cdn.com/20160411/9e24313db42860b02ef77ae5e3ba8f61.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>My main concern is still with the port length. I ultimately went with a 23" long port in a 23" deep box. I said "**** it", I'll figure it out as I go. The way I put it together I figured if I ended the port 3.5" inches from the back wall it'll act longer, as if it's trying to turn. If I drew a line down the middle of the port and had it turn 90° til it left the port space, then measured it it would 23" long. I'm 99% sure this logic is flawed in retrospect, but it made sense when I was numb from the cold. Is it close, though? Can I add a bit off length to correct this?</p><p></p><p>And bracing, should I add a board or a threaded rod somewhere in the middle?</p><p></p><p>I've long given up on having it perfect, but tuning and volume wise, I think it's within 5%. After taking about it for a month we're close.</p><p></p><p>When it's warmer, maybe next month, I'll make another box for my sa-18.</p><p></p><p>Sent from my SCH-I545 using Tapatalk</p></blockquote><p></p>
[QUOTE="Umbra, post: 8494549, member: 658055"] I thought the port area was just enough to prevent noise and seemed like a reasonable amount. If I'm way off, let me know. You're right, it does lower tuning and it makes perfect sense if you think about it. I had a brain fart. I hadn't considered a horn enclosure until you mentioned it. From my very brief research it sounds like they don't work well with low tunings and lots of power. I can't comment on the validity of those statements, but we went with a slot port because that's the design companies like JBL and Yamaha use, so there must be a reason. He wanted to build something comparable. He dragged me out into the cold and we built something. It's not finished, but it's close. It reminds me of a front loading washing machine. [IMG]http://uploads.tapatalk-cdn.com/20160411/b00584271904a5c208d54b03b20fd222.jpg[/IMG] The holes on the sides are for handles and the holes in the back are for connectors. The port doesn't have a division/brace down the middle; I just stuck that in there for assembly and drying. I could secure it, but I feel like that will reduce the port area and probably mess up the tuning. I was thinking of replacing it with a bolt or threaded rod for support. Thoughts? I meant to put a 45 piece in the corner of the port, but forgot as the sun was setting. I can still glue one in there. Maybe also in the corner opposite it. Here's a crappy sketch to illustrate: [IMG]http://uploads.tapatalk-cdn.com/20160411/9e24313db42860b02ef77ae5e3ba8f61.jpg[/IMG] My main concern is still with the port length. I ultimately went with a 23" long port in a 23" deep box. I said "**** it", I'll figure it out as I go. The way I put it together I figured if I ended the port 3.5" inches from the back wall it'll act longer, as if it's trying to turn. If I drew a line down the middle of the port and had it turn 90° til it left the port space, then measured it it would 23" long. I'm 99% sure this logic is flawed in retrospect, but it made sense when I was numb from the cold. Is it close, though? Can I add a bit off length to correct this? And bracing, should I add a board or a threaded rod somewhere in the middle? I've long given up on having it perfect, but tuning and volume wise, I think it's within 5%. After taking about it for a month we're close. When it's warmer, maybe next month, I'll make another box for my sa-18. Sent from my SCH-I545 using Tapatalk [/QUOTE]
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Can you do a straight port with a 2" bend?
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