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someone please check my math
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<blockquote data-quote="Beginer" data-source="post: 3062497" data-attributes="member: 573150"><p>Yes if we trust this formula so you hit too high.</p><p></p><p>Well as I understant so 1/4 wave theory should tell your your car cabin resonant freq.</p><p></p><p>But as I said I tryed to put sealed box in my trunk and findout resonant freq. At which frequency I hit most dB's that is cabin resonant freq. So I got ~50-51Hz. And actually I tryed two sealed box, one about 0.85cu.ft. another 4cu.ft //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif And with both I got most dB's at 50-51Hz.</p><p></p><p>And if we use 1/4wave formula so I resonant freq. should be at ~40Hz.</p><p></p><p>So as you see results are very different. :/</p><p></p><p>Also you say that your cabin resonant freq. is 48Hz, but with 1/4wave formula you get 40Hz... So also very different results.</p></blockquote><p></p>
[QUOTE="Beginer, post: 3062497, member: 573150"] Yes if we trust this formula so you hit too high. Well as I understant so 1/4 wave theory should tell your your car cabin resonant freq. But as I said I tryed to put sealed box in my trunk and findout resonant freq. At which frequency I hit most dB's that is cabin resonant freq. So I got ~50-51Hz. And actually I tryed two sealed box, one about 0.85cu.ft. another 4cu.ft [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] And with both I got most dB's at 50-51Hz. And if we use 1/4wave formula so I resonant freq. should be at ~40Hz. So as you see results are very different. :/ Also you say that your cabin resonant freq. is 48Hz, but with 1/4wave formula you get 40Hz... So also very different results. [/QUOTE]
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someone please check my math
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