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Need help with sub box design
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<blockquote data-quote="Buck" data-source="post: 8866391" data-attributes="member: 591582"><p>I'm willing to bet the manufacturer recommendations are probably what someone should use for a daily setup, and just tune the box where you want to try and peak. That Fs is quite high for today's times, at least from what I'm used to. I mean it's a high power, high Fs sub, low Qms, not a terribly high Mms for that power level, some subs at around 3k have 400, 600+, but with 4" coils. That relatively lower Mms for that wattage handling plays into the higher Fs, some. These are gonna move a lot of air at high frequency, and they're probably gonna peak hard at higher frequency, like 50-60+ hz or the sub's Fs combined with cabin resonance, idk what that would be. You could try tuning in the lower to mid 30's to try to drop the harshness of that over 45 hz hard peak it's probably going to have. I mean that's 6kw resonating hard, so I'd just tune as low as you need to hit the lowest you want to play, and the rest is going to be the rest. Probably do 5 cubes with 80 in^2 port area, but it should always be modeled to make sure. Maybe tune to 32-35 hz for an average daily. If you tune these subs low, you wanna model it to see if the port air velocity drops way off, because you might can shrink port area. Idk a good designer will be able to see things like that, lower tuning and smaller port can help musicality and controlling woofer cone, especially if you're going to fire forwards, but I'd only recommend that if you seal off the cabin, but I'd still try to do it in the trunk rear or firing up or something.</p><p></p><p>These come across to me as pretty stiff, high throw subwoofers, so they might resonate hard around Fs. I wish the Cms unit made sense; you can reverse engineer that sometimes with winisd Alpha. Idk what a m mm/N is. Cms is suspension compliance, as in how far the suspension moves when a force is applied, so it should be in m/N or mm/N one, which is millimeter/Newton, how many mm the suspension travels one way with a Newton of force applied, shows direct stiffness (compliance) of suspension. And that Vas is low, too (stiff).</p></blockquote><p></p>
[QUOTE="Buck, post: 8866391, member: 591582"] I'm willing to bet the manufacturer recommendations are probably what someone should use for a daily setup, and just tune the box where you want to try and peak. That Fs is quite high for today's times, at least from what I'm used to. I mean it's a high power, high Fs sub, low Qms, not a terribly high Mms for that power level, some subs at around 3k have 400, 600+, but with 4" coils. That relatively lower Mms for that wattage handling plays into the higher Fs, some. These are gonna move a lot of air at high frequency, and they're probably gonna peak hard at higher frequency, like 50-60+ hz or the sub's Fs combined with cabin resonance, idk what that would be. You could try tuning in the lower to mid 30's to try to drop the harshness of that over 45 hz hard peak it's probably going to have. I mean that's 6kw resonating hard, so I'd just tune as low as you need to hit the lowest you want to play, and the rest is going to be the rest. Probably do 5 cubes with 80 in^2 port area, but it should always be modeled to make sure. Maybe tune to 32-35 hz for an average daily. If you tune these subs low, you wanna model it to see if the port air velocity drops way off, because you might can shrink port area. Idk a good designer will be able to see things like that, lower tuning and smaller port can help musicality and controlling woofer cone, especially if you're going to fire forwards, but I'd only recommend that if you seal off the cabin, but I'd still try to do it in the trunk rear or firing up or something. These come across to me as pretty stiff, high throw subwoofers, so they might resonate hard around Fs. I wish the Cms unit made sense; you can reverse engineer that sometimes with winisd Alpha. Idk what a m mm/N is. Cms is suspension compliance, as in how far the suspension moves when a force is applied, so it should be in m/N or mm/N one, which is millimeter/Newton, how many mm the suspension travels one way with a Newton of force applied, shows direct stiffness (compliance) of suspension. And that Vas is low, too (stiff). [/QUOTE]
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