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Enclosure Design & Construction
ported box for SQL 15 possible in my car?
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<blockquote data-quote="Wolv19D" data-source="post: 8759260" data-attributes="member: 683493"><p>I had a couple Fi Q 12s many years ago myself and strangely plan to buy a couple SQL-15s in the next couple months. I have been doing a lot of modeling in WinISD for what it's worth to give me a general idea of how the sub performs without cabin gain coming into the equation. I am a novice at this so hope to learn more about cabin gain in the near future along with everything else. </p><p></p><p>Anyways, the higher you tune a box the smaller you should make it to keep it from peaking so much. So the 4.25 is at 22hz and at 32hz I would at least knock it down to 4 cubes and possibly all the way down to 3.5 cubes. The bigger you make the box the more efficient it will be and it will have a little more low end as well but like I said there is a trade off in that it has a bigger peak where it's tuned at. And the bigger you make the box the less power the sub can handle since it's more efficient. </p><p></p><p>How much power are you running? The SQL is rated at 1000rms but I have read on other forums of people running up to 3k daily on them but that's without continuous heavy bass tracks for extended periods. My guess is 1500 would be no problem and 2k would also likely be fine if it was clean power. </p><p></p><p>I am planning on tuning around 25-28hz on mine to have a very flat response for a more SQ oriented build to try out. But I also may build a box in the 30-32hz range to compare. Even at 32hz it isn't too peaky at tuning as long as the box isn't huge. The SQL's like small boxes and it would do well even in 3 cubes. But like I said I would likely do 3.5-4 cubes if you are doing 32hz or just say 3.75 cubes. </p><p></p><p>As for port area that is another area I am still learning about and every sub is different. Most places that have high xmax subs like these recommend at least 15 square inches of port per cube so at 4 cubes that would be 60 square inches. But that said many also do fine running lower then that at around 12.5" per cube or about 50 square inches total. Your 45 square inches would likely be fine but I couldn't say for sure. I'm not sure how much truth there is to this but I have read a couple people say more port area may allow a higher SPL to a certain extent but a lower port area may allow you to play below tuning a little bit better and possibly be more musical? Again I am not an expert at all. </p><p></p><p>But since the SQL's don't typically reach xmax until way past the 1000w then perhaps a higher port area would be better? I am guessing here and it could be the complete opposite. But if you just wanted to play it safe the standard 15" per cube almost every place recommends would be a safe bet. So 3.75 cubes with about 56 square in of port. </p><p></p><p>I highly recommend having Buck design a box for you if you are going to go through the trouble of building it yourself the extra few dollars to have him design a box is likely money well spent. He takes all of this stuff into account. But if you don't choose to go with him then play around with sub box pro a little to get even numbers for an easier build. If your trunk is truly only 19" tall I would likely leave as much room as I could above it for the air to get back to the front of the vehicle so a 16-17" tall box at most.</p></blockquote><p></p>
[QUOTE="Wolv19D, post: 8759260, member: 683493"] I had a couple Fi Q 12s many years ago myself and strangely plan to buy a couple SQL-15s in the next couple months. I have been doing a lot of modeling in WinISD for what it's worth to give me a general idea of how the sub performs without cabin gain coming into the equation. I am a novice at this so hope to learn more about cabin gain in the near future along with everything else. Anyways, the higher you tune a box the smaller you should make it to keep it from peaking so much. So the 4.25 is at 22hz and at 32hz I would at least knock it down to 4 cubes and possibly all the way down to 3.5 cubes. The bigger you make the box the more efficient it will be and it will have a little more low end as well but like I said there is a trade off in that it has a bigger peak where it's tuned at. And the bigger you make the box the less power the sub can handle since it's more efficient. How much power are you running? The SQL is rated at 1000rms but I have read on other forums of people running up to 3k daily on them but that's without continuous heavy bass tracks for extended periods. My guess is 1500 would be no problem and 2k would also likely be fine if it was clean power. I am planning on tuning around 25-28hz on mine to have a very flat response for a more SQ oriented build to try out. But I also may build a box in the 30-32hz range to compare. Even at 32hz it isn't too peaky at tuning as long as the box isn't huge. The SQL's like small boxes and it would do well even in 3 cubes. But like I said I would likely do 3.5-4 cubes if you are doing 32hz or just say 3.75 cubes. As for port area that is another area I am still learning about and every sub is different. Most places that have high xmax subs like these recommend at least 15 square inches of port per cube so at 4 cubes that would be 60 square inches. But that said many also do fine running lower then that at around 12.5" per cube or about 50 square inches total. Your 45 square inches would likely be fine but I couldn't say for sure. I'm not sure how much truth there is to this but I have read a couple people say more port area may allow a higher SPL to a certain extent but a lower port area may allow you to play below tuning a little bit better and possibly be more musical? Again I am not an expert at all. But since the SQL's don't typically reach xmax until way past the 1000w then perhaps a higher port area would be better? I am guessing here and it could be the complete opposite. But if you just wanted to play it safe the standard 15" per cube almost every place recommends would be a safe bet. So 3.75 cubes with about 56 square in of port. I highly recommend having Buck design a box for you if you are going to go through the trouble of building it yourself the extra few dollars to have him design a box is likely money well spent. He takes all of this stuff into account. But if you don't choose to go with him then play around with sub box pro a little to get even numbers for an easier build. If your trunk is truly only 19" tall I would likely leave as much room as I could above it for the air to get back to the front of the vehicle so a 16-17" tall box at most. [/QUOTE]
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ported box for SQL 15 possible in my car?
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