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bandpass designers stand up
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<blockquote data-quote="DNick454" data-source="post: 6024657" data-attributes="member: 600755"><p>I've been kind of busy here lately. But here's what I've come up with so far...</p><p></p><p>I know that WinISD does not represent and exact real world application, but it does a pretty good job at recreating transient curves in respective boxes with the said driver. It doesn't account for the acoustical effects of the surroundings, but this is going in a larger room, so there shouldn't be as large of an effect as a car cabin.</p><p></p><p>Here's some of the results I came up with using the JL Audio 12W3v3 driver. First off, it appears this driver doesn't really like 4th order bandpass enclosures. No matter how much I fiddled with it, I would either get a flat response, but with low output, or a super high peak (typical of best buy bandpass boxes //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif) so I also plotted a regular ported box. 1.75 cubic feet net as recommended by JL with a middle of the road tune @ 35Hz. It gave a decent response with fair output, better than the 4th order in my opinion. Surprisingly, the 6th order yielded really great results. With a 3 cube chamber tuned to 32 Hz and a 1.5 cube chamber tuned to 60 Hz, it gave excellent output from 30-80Hz range which should be good for your setup. Here's the transient curves so you can decide for yourself.</p><p></p><p><span style="color: Cyan"><strong>4th Order Bandpass Enclosure</strong></span></p><p></p><p><span style="color: Wheat"><strong>Single Bass Reflex (Ported)</strong></span></p><p></p><p><span style="color: Magenta"><strong>6th Order Bandpass</strong></span></p><p></p><p><img src="http://img394.imageshack.us/img394/7968/6thorderbandpassg.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>I'm in the process now of making a physical design to those volumes/tuning. I'll post some more stuff tomorrow.</p></blockquote><p></p>
[QUOTE="DNick454, post: 6024657, member: 600755"] I've been kind of busy here lately. But here's what I've come up with so far... I know that WinISD does not represent and exact real world application, but it does a pretty good job at recreating transient curves in respective boxes with the said driver. It doesn't account for the acoustical effects of the surroundings, but this is going in a larger room, so there shouldn't be as large of an effect as a car cabin. Here's some of the results I came up with using the JL Audio 12W3v3 driver. First off, it appears this driver doesn't really like 4th order bandpass enclosures. No matter how much I fiddled with it, I would either get a flat response, but with low output, or a super high peak (typical of best buy bandpass boxes [IMG]//content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif[/IMG]) so I also plotted a regular ported box. 1.75 cubic feet net as recommended by JL with a middle of the road tune @ 35Hz. It gave a decent response with fair output, better than the 4th order in my opinion. Surprisingly, the 6th order yielded really great results. With a 3 cube chamber tuned to 32 Hz and a 1.5 cube chamber tuned to 60 Hz, it gave excellent output from 30-80Hz range which should be good for your setup. Here's the transient curves so you can decide for yourself. [COLOR=Cyan][B]4th Order Bandpass Enclosure[/B][/COLOR] [COLOR=Wheat][B]Single Bass Reflex (Ported)[/B][/COLOR] [COLOR=Magenta][B]6th Order Bandpass[/B][/COLOR] [IMG]http://img394.imageshack.us/img394/7968/6thorderbandpassg.png[/IMG] I'm in the process now of making a physical design to those volumes/tuning. I'll post some more stuff tomorrow. [/QUOTE]
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