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<blockquote data-quote="Kyle_Keating" data-source="post: 7056540" data-attributes="member: 582385">A lot of music has content below 20Hz now days. Most users tune boxes TOO high in attempt to gain output and it does work, but the problem is you only gain output near tuning so you end up with peaks in the response. Take a look at this example.<img src="http://www.data-bass.com/img/LEAP08.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" />purp line&nbsp; is 5 cubes tuned to 20orange line is 5 cubes tuned to 30green is 2.5 cubes to 30only the purple is a good alignment because the rest are high Q and you wont hear the upper bass because of the added SPL down around tuning. Lots of people go for the large box high tune (and in this case, 30Hz is not even that high, but look at what is does to the response) This 15&quot; woofer has a Qts of only about 0.4. If its lower this effect gets even worse and many woofers have lower Q&#039;s.If you want a little boost around 30Hz and don&#039;t care for too much output below without giving up sound quality then in that case you actually need a smaller 3.75 cubic foot box tuned around 23Hz (much lower then you think). Which looks like the green line which is a good enhanced Q alignment without too much boom.<img src="http://www.data-bass.com/img/LEAP10.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" />These numbers i&#039;m throwing around are different for all woofers and in this case i tried to pick a pretty standard 15&quot; so its somewhat applicable. but the best thing to do is model the design ins WinISD - which is free and pretty easy to use.</blockquote>

[QUOTE="Kyle_Keating, post: 7056540, member: 582385"] A lot of music has content below 20Hz now days. Most users tune boxes TOO high in attempt to gain output and it does work, but the problem is you only gain output near tuning so you end up with peaks in the response. Take a look at this example. [IMG]http://www.data-bass.com/img/LEAP08.gif[/IMG] purp line is 5 cubes tuned to 20 orange line is 5 cubes tuned to 30 green is 2.5 cubes to 30 only the purple is a good alignment because the rest are high Q and you wont hear the upper bass because of the added SPL down around tuning. Lots of people go for the large box high tune (and in this case, 30Hz is not even that high, but look at what is does to the response) This 15" woofer has a Qts of only about 0.4. If its lower this effect gets even worse and many woofers have lower Q's. If you want a little boost around 30Hz and don't care for too much output below without giving up sound quality then in that case you actually need a smaller 3.75 cubic foot box tuned around 23Hz (much lower then you think). Which looks like the green line which is a good enhanced Q alignment without too much boom. [IMG]http://www.data-bass.com/img/LEAP10.gif[/IMG] These numbers i'm throwing around are different for all woofers and in this case i tried to pick a pretty standard 15" so its somewhat applicable. but the best thing to do is model the design ins WinISD - which is free and pretty easy to use. [/QUOTE]

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