bandpass help

EXPERTS NEEDED:::

ok, my friend and i are building a custom box for his 99 explorer sport... he has three 12s. one bazooka, and two alpine e's. we want a band pass box so it needs to be ported, that screws up ALL of our original designs. the alpines need 1.25-2.0' and the bazooka needs 2.0 (all ported of course). well.. in the calculation section of the site here it asks for port diameter and length.. does the length matter that much?!?! what if the box height is 15 inches.. can the port be 14.9 or what?? i dont understand ported boxes. and also how do i figure out the volume needed in the plexi glass portion?? or does it matter?? the response level on the alpines are 26-1000 hz, how does that effect the port too? sorry about all the questions. if someone or some of yall can help, it would be greatly appreciated. thanks guys.

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-Ryan Strobel

you shouldn't mix those subs in most any configuration.. the port length decides the tuned frequency of the box..i personally cant help much about the bandpass..sry

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Quad L Handyman services

I think you should nix the idea of using the bazooka sub and put the alpine e's in a ported box with about 1.75 cf in each chamber. I dont think alpine intended for this sub to be put in a bandpass box.

yes, 86 that bazooka get another alpine if you have to have 3 subs. a "sealed" box will sound much better than a "band pass" or "ported" box. They may both be louder and thats cool if you like spl, but for sq go sealed with the right air space for that sub. You need a amp that will match those subs too. good luck with your project.

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Big Dave

ported boxes can achieve great SQ also if the enclosure is properly built and tuned.  also when you asked if you could make a 14.9" port for a 15" deep box, never put a port that close to a wall, it is always a good rule of thumb to make sure the port is at least 1 thickness of the port away from every wall of the enclosure

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what!?!?! you want some??

  Yes port size and length matters, just ask any girl-ha ha.  Seriously, a well tuned box will sound noticably different.  I recently built a ported box for 2 Audiobahns to replace the bandpass box they were in and tuned it to 36 Hz using 6.5 in. ports, it pounds!  I hated the way they sounded in the bandpass-stick w sealed or ported--your subs will thank you!

Say no to crack, yellow snow, waking up with fat chicks, bandpass boxes, anything Bose, or Sony, Chevy, GMC, mixing driver sizes, speedos, Milli Vanilli, American Idol, mixing different sub brands, speeding (excessive speed killed my best friend), the Calgary Flames (burn in hell), well that's all the advice I can give right now, it's been pretty much covered by everyone else.

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Top Secret, I can tell you but then my wife will kill me.

Not to mention the fact that if a driver says it wants 1.25 to 2.0 cu.ft., you CANNOT put it in a bandpass enclosure of that size, unless you LIKE buying woofers. Bandpass boxes are not forgiving at all, as little as 5 to 10 percent off either way, in front or rear volume, port length, or port diameter can literally tear a woofer to pieces. Bandpass boxes are best left to experts, and I NEVER recommend an "off-the-shelf" bandpass enclosure. The response from, and longevity of, a bandpass box is irrevocably linked to the Theil-Small parameters of the driver. You must know those exactly, then build the enclosure FOR that driver. They may work for *one* driver, but not the *one* you have, and not every driver.

Oh, and Ford, too...

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

aww you cant be a ford fan......

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Quad L Handyman services

no, that was a continuation of forbidden's thoughts about things to avoid... friends don't let friends drive fords...

Unless they are a  lifted diesel F350

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Top Secret, I can tell you but then my wife will kill me.

I agree with the above, especially about nixing the three-mixed-subs-in-one-enclosure idea.  I suggest you only attempt a bandpass enclosure if you have enough experience to pull it off - and no offense, but judging from your port length question you don't.

If you must attempt a bandpass, there are some good tips at www.diysubwoofers.org

So, no Ford, no GM... don't tell me you guys are CHRYSLER fans?

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Support the12volt.com

nah... HONDA! putt, putt... LOL

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."