bandpass help

Home / the12volt's Install Bay / Car Audio / bandpass help (

Topic Closed)

Welcome Guest :)

Members

Next Page > < Prev Topic Next Topic >

ryanstrobel

Member - Posts: 5

Joined: April 07, 2004

Location: United States

Posted: April 19, 2004 at 8:55 PM / IP Logged

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.

-Ryan Strobel

Ketel22

Silver - Posts: 976

Joined: August 23, 2003

Location: United States

Posted: April 19, 2004 at 9:06 PM / IP Logged

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

Quad L Handyman services

customsuburb

Gold - Posts: 1,813

Joined: January 17, 2004

Location: United States

Posted: April 19, 2004 at 10:07 PM / IP Logged

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.

speedwayaudio1

Silver - Posts: 879

Joined: March 18, 2003

Location: United States

Posted: April 19, 2004 at 11:46 PM / IP Logged

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. bandpass help -- posted image.

Big Dave

Search for other posts by speedwayaudio1

kickerstang

Copper - Posts: 180

Joined: April 08, 2004

Location: United States

Posted: April 20, 2004 at 7:04 AM / IP Logged

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

what!?!?! you want some??

alex75

Copper - Posts: 134

Joined: March 30, 2004

Location: United States

Posted: April 20, 2004 at 2:34 PM / IP Logged

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!

forbidden

Platinum - Posts: 5,354

This member has made a donation to the12volt.com. Click here for more info.

This member has been recognized as an authority in Mobile Audio and Video. Click here for more info.

Joined: November 01, 2003

Location: Alberta, Canada

Posted: April 20, 2004 at 7:24 PM / IP Logged

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.

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

haemphyst

Platinum - Posts: 5,059

This member has been recognized as an authority in Electrical Theory. Click here for more info.

Joined: January 19, 2003

Location: Michigan, Bouvet Island

Posted: April 20, 2004 at 7:41 PM / IP Logged

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...

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."

Ketel22

Silver - Posts: 976

Joined: August 23, 2003

Location: United States

Posted: April 20, 2004 at 7:42 PM / IP Logged

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

Quad L Handyman services

haemphyst

Platinum - Posts: 5,059

Joined: January 19, 2003

Location: Michigan, Bouvet Island

Posted: April 21, 2004 at 9:20 AM / IP Logged

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

Next Page >

Printable version

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

Search the12volt.com

Follow the12volt.com

Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.