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Enclosure Design & Construction
Calculating sealed box resonance (f3)
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<blockquote data-quote="rickymac21" data-source="post: 8162442" data-attributes="member: 604748"><p>Ok so I'm still trying to design this 4th order but not before I completely understand everything first.</p><p></p><p>I found somewhere that to find the F3 of the sealed chamber (or any plain ol sealed box) is used by a simple formula....</p><p></p><p>[(vas/vb)+1)^2] x Fs .... Assuming both vas and vb are in liters, I should with a certain vb shoot for an F3 of 45 hz correct? Or could I shoot for a lower F3 in the sealed chamber since I want to tune my ported chamber @ 40hz to pound lows??</p><p></p><p>The problem I've been having is I do this equation with the woofers I plan on using (American bass TNT) and I keep getting an F3 that's EXTREMELY high.</p><p></p><p>Here's the math with a sealed box (vb) of 2.25 cubic ft (63.712 L)....</p><p></p><p>[(77.2/63.712)]+1}^2 = 4.89 ...... 4.89 x 32.2(fs)= 157</p><p></p><p>What am I missing here? An F3 of 157hz is just stupid and no matter what woofer I put into this equation comes out this way. I've changed box sizes as well.. Is it my equation?</p><p></p><p>I just want to know so i can put these 2 15's in the best possible box for the output I want (LOOOWWWS)....</p><p></p><p>Somebody help me out here. I'm trying to figure everything out myself but as you can see, I'm having troubles.</p></blockquote><p></p>
[QUOTE="rickymac21, post: 8162442, member: 604748"] Ok so I'm still trying to design this 4th order but not before I completely understand everything first. I found somewhere that to find the F3 of the sealed chamber (or any plain ol sealed box) is used by a simple formula.... [(vas/vb)+1)^2] x Fs .... Assuming both vas and vb are in liters, I should with a certain vb shoot for an F3 of 45 hz correct? Or could I shoot for a lower F3 in the sealed chamber since I want to tune my ported chamber @ 40hz to pound lows?? The problem I've been having is I do this equation with the woofers I plan on using (American bass TNT) and I keep getting an F3 that's EXTREMELY high. Here's the math with a sealed box (vb) of 2.25 cubic ft (63.712 L).... [(77.2/63.712)]+1}^2 = 4.89 ...... 4.89 x 32.2(fs)= 157 What am I missing here? An F3 of 157hz is just stupid and no matter what woofer I put into this equation comes out this way. I've changed box sizes as well.. Is it my equation? I just want to know so i can put these 2 15's in the best possible box for the output I want (LOOOWWWS).... Somebody help me out here. I'm trying to figure everything out myself but as you can see, I'm having troubles. [/QUOTE]
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