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post #1 of 12 (permalink) Old 07-05-2002, 07:10 PM
sinsstr
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Well, I have no idea how it will sound, but I'm having fun building it! Actually I know how it SHOULD sound, but we all know how that goes...

It's a 3 chamber, fourth-order bandpass designed to vent through the armrest hole in the back seat. The "vent" is a plastic vase I got at a craft store (yes, the bottom will eventually be cut out). I'm hoping the flared design will help cut down on port noise. The small diameter side is what the design calls for, so I think it should work.





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post #2 of 12 (permalink) Old 07-05-2002, 07:35 PM
college slacker
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Holy crap, dude! That's awesome. Hope it sounds as good as it looks. I'd like to see how that port looks when it's in the car, too.
post #3 of 12 (permalink) Old 07-05-2002, 07:59 PM
sinsstr
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The middle section looks big now, but as you can see by the black marks my spare will eat up a lot of that space. Overall it probably could have been a little smaller, but I think this arrangement will work out nice. If not, it'll make a good bonfire.
 
post #4 of 12 (permalink) Old 07-05-2002, 08:43 PM
camel
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that looks like one crazy box. i hope you know all of the volumes and stuff of that vase, otherwise it might tune the box wrong and not sound as good as you expected. you still have more panels to put on the box right? i'm curious where you got the box design from aswell.
post #5 of 12 (permalink) Old 07-05-2002, 09:44 PM
sinsstr
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<BLOCKQUOTE>quote:</font><HR>Originally posted by camel:
that looks like one crazy box. i hope you know all of the volumes and stuff of that vase, otherwise it might tune the box wrong and not sound as good as you expected. you still have more panels to put on the box right? i'm curious where you got the box design from aswell.<HR></BLOCKQUOTE>


Using the TS parameters for one of the speakers I get 1 cu. ft. for the sealed side and .7 cu. ft. for the vented side for a fourth order bandpass box. The most consistent information I have found says to double the volume of the common vented section when using two drivers and a common vented chamber, so it will end up being 1.4 cu. ft.

Not sure about the port, I'm kind of winging it. Should be easy to change though.
post #6 of 12 (permalink) Old 07-09-2002, 08:42 PM
Supaman
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Hey I likes. but my only concern is do you have enough air space when you close it all up it looks like you have 15's you should have about 2.5 cube feet for air if less add some polyfill. I really like.
post #7 of 12 (permalink) Old 07-10-2002, 04:23 PM
sinsstr
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<BLOCKQUOTE>quote:</font><HR>Originally posted by Supaman:
Hey I likes. but my only concern is do you have enough air space when you close it all up it looks like you have 15's you should have about 2.5 cube feet for air if less add some polyfill. I really like.<HR></BLOCKQUOTE>

They're DVC 12's, and they call for 1.0 cu. ft. each of airspace, which is what they have on the sealed side right now. Like I said, the vented side is waaaaay too big right now, but when I cut out the notch for the spare it should be a lot closer to where it should be. I'll just add bracing to bring it to the right size.

I plan to close it all up temporarily and put the RTA on it to see how close I'm getting to how it actually sounds. One thing I didn't think of with this design is that when you double the volume of the middle chamber, it would make sense that you need a different size port to tune the box to the right frequency. Right now the way I have it is with double the volume you would have for a box with a single driver, but I kept the port size the same. I don't think that's right, but I can't find any info anywhere to verify it.

I'm going to try it the way it is, and if it's way off I'll know I have to recalculate the port size for the doubled volume.

(Anyone else's head hurt yet??? )
post #8 of 12 (permalink) Old 07-10-2002, 05:22 PM
northstar_v8
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Quite a project you've got going on there! Looking forward to hearing how it sounds when finished.

What will you do if one of the subs goes bad though? Looks like you're going to have them sealed completely in the box, out of sight. Bandpass boxes are notorious for hiding the distortion that kills subs... you wouldn't know if you were overdriving them until it was too late. Just something to think about [img]0.gif[/img]
post #9 of 12 (permalink) Old 08-06-2002, 11:10 AM
5.0 Killer
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So, how did it turn out? Do you have it installed yet? I would like to see just how much room it is taking up. Did you stay with the port job, or just port the rear deck? Thanks.
post #10 of 12 (permalink) Old 08-06-2002, 03:12 PM
FleetwoodSS
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Yeah man, that's killer! Do you have blueprints for the rest of us??? (I'm serious)
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