Bandpass Enclosure

I have a white 93 Cadillac Deville.  The trunk has about 15" of clearance in the back.  I just purchased 4, 10" Audiobahn AW1000X Subs.  I have 2 of them in Folded Foghorn Ported boxes that i made and it quakes.  But i can tell there is so much pressure in the trunk thinks are starting to rattle.  All that bass billowing around in the trunk is wasted bass in my opinion.  One of my 6x9's is already toast because of it.  I know it can be done with my subs because thats what the tech told me.  He said he cant give me specs on a bandpass box because there are too many things that could go wrong.  Is there anyone that can help me out with specs on a bandpass enclosure for my 4 audiobahn 10's.  I will even pay someone if they can figure out a bandpass box that works.  I have spent so much money on a system that i am not happy with.  Please help me out here.

Todd Briske 

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4, AudioBahn AW1000x Subs
2, Optima Red Tops
2, Zues D1000's

Why do you want to build a bandpass enclosure?

Call Audiobahns tech support 714-988-0400 they should be able to give you the specs. Also you may want to consider venting your trunk into your cars cabin. It will allow your trunk to breathe resulting in increased SPL in the cabin.

id go to www.powered4sound.com

and buy his double shot box.

Look at the vids too....there is some crazy stuff in there.

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I need quality equipment, feel free to donate.

Call Audiobahns tech support 714-988-0400 they should be able to give you the specs. Also you may want to consider venting your trunk into your cars cabin. It will allow your trunk to breathe resulting in increased SPL in the cabin.

i would scrap the band pass box. I would use a sealed  or ported box. then i would take the 6x9's out of the rear deck, put them in there own box. then dyno mat or some other brand of sound deading for your trunk. lay it on thick the sides the deck lid don't leave a spec uncoverd. that should help you out. ported and sealed boxes are a lot easyer to build. and i think a lot better.

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Big Dave

I want a bandpass enclosure so all of the bass will be ported straight into the cabin.  I hate the thought of all that bass banging around in the trunk when it could be filling up the cabin.  I have 2 of them hooked up in a Dual Folded Foghorn box, which is similar to that Double Shot box on www.power4sound.com.  Just the 2, 10's are hitting disgustingly hard but my trunk is about to explode.  I already crushed a 6x9.  there is no way i am adding the other 2, 10s.  I would love to but the rattles in the trunk just wouldnt be worth it.  Thanks for all your help.

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4, AudioBahn AW1000x Subs
2, Optima Red Tops
2, Zues D1000's

Adding to what has already been written above, I do not think a bandpass enclosure would give you the effect you are looking for.  As Speedwayauto and bberman said, deaden your trunk to relive you of some of the rattles, and use the openings you now have your 6x9's in to port the trunk into the car's cabin.  Leave the openings clear and cover them with a speaker grill that has no speaker in it, for example.  Good luck!

Some really good ideas guys, here are some more. A lot of statements about sound deadening the trunk. #1 good idea. Old Isaac Newton is right, each action has an equal and opposite reaction. You are losing this bass energy tht you should be listening to as it is being transformed into energy causing things to rattle. Solve this problem with sound deadening. Your speaker (6x9) probably blew beacuse of a distorted signal being fed into it that you couldn't hear due to the more powerfull bass form the subs tht play at the same frequency and also due to the fact that your subs were physically moving so much air that it caused the 6x9's speaker cones to move and distort. So if you want the rear 6x9's to work in the future, you need to isolate them from the shock wave of the subs (also known as speaker hats or baffles) and probably would be a good idea to cap off the 6x9's or engage a high pass filter and amplifiy them. Do you know what the term Bandpass means? Do a little research and I'm sure you will agree with most of the veterans and even newbie's that are responding to you that it is not the way to go. A sealed box or properly constructed ported enclosure is your best bet. As DYohn suggested above, you need to get the output of the subs into the cabin, concentrate your efforts here as well. Sound has frequencies, those frequencies have wavelenghts, the lower the frequency  - the longer the wavelength. If you want to enjoy as much sound as possible it is usually accomplished by pointing the subs to the rear of the vehicle. Listen to what these guys have suggested above, they are right and eliminate the bandpass idea.

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

yes a band pass box is not a good choice. trust us use a sealed or ported. face the subs to the rear of your trunk, and as far back as possible. building a band pass is very hard if your not an expert. ported and sealed can be build by a novice following plans very easyly. good luck with your project.

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Big Dave

Thank you everybody for your help.  I decided to try out this box a buddy of mine designed.  He calls it a folded Foghorn ported Box.  He is making a design out for my 4, 10's.  I just ordered this stuff off of Ebay called "Brown Bread."  It's a sound deadening material.  It was $130 for 75 sq ft of it.  I also ordered a 200 Amp alternator which will replace the 140 amp alternator in my caddy.  My 6x9's are amplified.  They are MB Quarts, When i dont have the bass going they sound fine.  So maybe they  aren't blown.  I am going to take make 2 baffles for them.  As for the airflow thing, I am making a hole in my middle console that will be about 4x11, there is also a hole between the 6x9's that is 4x10.  I think i will make that hole a bit bigger.  A friend of mine is good with fabric so he is going to fabricate something to go over both holes that i made so it looks clean.  THanks for all your help. 

Todd

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4, AudioBahn AW1000x Subs
2, Optima Red Tops
2, Zues D1000's