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Help with 4th order bandpass (12" fi Q)
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<blockquote data-quote="plexlove" data-source="post: 8355346" data-attributes="member: 659014"><p>Yeah im in the process of building a 4th for my 2 zv4 sundown 18s and asked for a lil help and got nothing lol.</p><p></p><p>Researched non stop for 2 days and off and on this whole week and still cant find the answrr im needing.</p><p></p><p>Basically as long as the sub u have will work well in one its kinda up to u dependig on what ur going for for the rest.</p><p></p><p>Im doin 3to1 ratio, subs firing into the sealed to help with cooling and so i can smell if somethings wrong. Doin 2.75 each sub sealed and 18ish ported, 15.5 after all displacements.</p><p></p><p>245 inches port area tuned to 42hz. Tune higher than normal because of the sealed box! Most tune to 45hz but i wanna make sure i get the lows.</p><p></p><p>Runnin 1/4" steel bar in 4 strips on the bottom of my bed in my avalanche and bolting them down, then runnin 4 more on top of my box and runnin .5inch allthread from top to bottom for bracing. Cant think off any better way to brace than that and should help drastically with box rise!</p><p></p><p>Glassing the inside and doin 45s on all corners...only 2 things i havnt figured out is if to use a square port or aero and also i have an fc of like 67hz....that thew me!</p><p></p><p>I tried asking what i should tune to since my fc is so high in my sealed box but get absolutely no help. Just a bunch of smartasses talking crap for no reason!</p><p></p><p>Guess ill just wing it...its only 1400 dollars if they go up in smoke lol.</p><p></p><p>If u have any questions that u cant figure out after researching, pm me ill be glad to help if i can! Good luck man</p></blockquote><p></p>
[QUOTE="plexlove, post: 8355346, member: 659014"] Yeah im in the process of building a 4th for my 2 zv4 sundown 18s and asked for a lil help and got nothing lol. Researched non stop for 2 days and off and on this whole week and still cant find the answrr im needing. Basically as long as the sub u have will work well in one its kinda up to u dependig on what ur going for for the rest. Im doin 3to1 ratio, subs firing into the sealed to help with cooling and so i can smell if somethings wrong. Doin 2.75 each sub sealed and 18ish ported, 15.5 after all displacements. 245 inches port area tuned to 42hz. Tune higher than normal because of the sealed box! Most tune to 45hz but i wanna make sure i get the lows. Runnin 1/4" steel bar in 4 strips on the bottom of my bed in my avalanche and bolting them down, then runnin 4 more on top of my box and runnin .5inch allthread from top to bottom for bracing. Cant think off any better way to brace than that and should help drastically with box rise! Glassing the inside and doin 45s on all corners...only 2 things i havnt figured out is if to use a square port or aero and also i have an fc of like 67hz....that thew me! I tried asking what i should tune to since my fc is so high in my sealed box but get absolutely no help. Just a bunch of smartasses talking crap for no reason! Guess ill just wing it...its only 1400 dollars if they go up in smoke lol. If u have any questions that u cant figure out after researching, pm me ill be glad to help if i can! Good luck man [/QUOTE]
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Help with 4th order bandpass (12" fi Q)
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