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4th order bandpass in the bed....4 12's

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Old 06-29-2009, 08:54 PM   #1
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4th order bandpass in the bed....4 12's

Well, i finally got the guts, and the money, to finally build a 4th order bandpass box in the bed of my truck. I just started on it the other nite, so far this is what i got. Still got LOTS of finishing and other little touches to do to it but its a start... o, btw, only the 2 top ports are actually ports...










And here are the subs, All new RE Audio SEx 12's. Hopefully four is enough







Old 06-29-2009, 09:14 PM   #2
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Re: 4th order bandpass in the bed....4 12's

gotta question...what would be the advantage over doin a 4th order and just a reg. ported box?? lol and whats powerin them??
Old 06-29-2009, 09:30 PM   #3
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Re: 4th order bandpass in the bed....4 12's

I heard bandpasses suck a$$ in a blowthrough
Old 06-29-2009, 09:37 PM   #4
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Re: 4th order bandpass in the bed....4 12's

efficiency for the most part... and the fact that it carries a good passband.
Old 06-29-2009, 09:37 PM   #5
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Re: 4th order bandpass in the bed....4 12's

Quote: Originally Posted by fallens10
I heard bandpasses suck a$$ in a blowthrough
i heard the rumors too.. why is it?
Old 06-29-2009, 09:41 PM   #6
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Re: 4th order bandpass in the bed....4 12's

I had a 4th order bp passthrough in my reg cab with two Fosgate P3 12's. Even with a small amp, 200watts, it jammed really hard. I only had the two 6" ports blowing through the cab wall too. Can't imagine what 4 12's with those two huge ports is gonna do.
Old 06-29-2009, 09:44 PM   #7
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Re: 4th order bandpass in the bed....4 12's

not worried about it getting stolen? i worry about my one kenwood 10 and amp
Old 06-29-2009, 09:46 PM   #8
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Re: 4th order bandpass in the bed....4 12's

i think alot of it has to do with the fact that the box tuning changes when u load it in something like a standard cab. every little thing will affect the way a bandpass box sounds and the way it presents load on the woofer(s). its a ported box within a ported box when its blown thru a cab-more or less.... or summin like that lol....
Old 06-29-2009, 09:49 PM   #9
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Re: 4th order bandpass in the bed....4 12's

looking good. Keep up with the pictures.

There is nothing wrong with a bandpass enclosure, just so long as it is properly designed and built for the drivers that are being used. Great sound quality can be achieved.
Old 06-29-2009, 09:53 PM   #10
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Re: 4th order bandpass in the bed....4 12's

also i heard that blwothroughs will make the tuning of ur box lower if the port is to far away from the cab openeing...sorry dont mean to jack ya thread. lol
Old 06-29-2009, 09:55 PM   #11
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Re: 4th order bandpass in the bed....4 12's

thanks! yea, i'm not worried bout anything getting stolen. the box will be bolted down and it will take 3 people to lift it out anyways lol plus i got a tonno to keep things "under wraps".
Old 06-29-2009, 09:57 PM   #12
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Re: 4th order bandpass in the bed....4 12's

the port actually will protrude into the cab about 2 inches roughly so that shouldn't be a problem... the only thing that worries me is the fact that i'm cuttin a big-damn hole in my cab lmao
Old 06-29-2009, 10:05 PM   #13
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Re: 4th order bandpass in the bed....4 12's

keep the pieces and cut it with a sawzal.. the line is fine enough it can be rewelded in..
Old 06-29-2009, 10:17 PM   #14
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Re: 4th order bandpass in the bed....4 12's

yea.... it should be ight! but i guess i'll find out later, maybe this weekend, what exactly it's gonna sound like... I need to get a better amp down the road but for now, i'm goin to try a....PA 5500 BAMF -grits teeth-
Old 06-30-2009, 12:30 AM   #15
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Re: 4th order bandpass in the bed....4 12's

make some noise
Old 07-02-2009, 07:39 PM   #16
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Re: 4th order bandpass in the bed....4 12's

well, i got to work on the box a lil bit this week after work... all thats left is to put the top on it, seal the box with something, cut the bed/cab and slide'er on in and see what it sounds like here are a few teasers for now......












Last picture before they get covered up....

Old 07-03-2009, 10:36 PM   #17
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Re: 4th order bandpass in the bed....4 12's

if youre going through all that effort why not build a 6th order bandpass to extend your frequency range and flatten your response?
Old 07-04-2009, 08:37 PM   #18
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Re: 4th order bandpass in the bed....4 12's

i had to keep everything under the tonno cover and still have room around the tailgate to put things...its an everyday driver.... just didn't have room 4 6th order...
Old 07-04-2009, 10:36 PM   #19
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Re: 4th order bandpass in the bed....4 12's

could have gone with less or more space efficient subs (high BL and possibly VAS)
Old 07-05-2009, 12:35 AM   #20
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Re: 4th order bandpass in the bed....4 12's

Looks like its gonna pound Keep the pics coming
Old 07-05-2009, 01:58 AM   #21
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Re: 4th order bandpass in the bed....4 12's

i hope you aint pushin that with a 4cyl.

looks good, oughta sound tight.........
Old 07-05-2009, 10:55 AM   #22
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Re: 4th order bandpass in the bed....4 12's

So what are the overall exterior dimensions?...This thing looks huge for a daily. haha
Old 07-05-2009, 08:26 PM   #23
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Re: 4th order bandpass in the bed....4 12's

wouldn't a more efficient sub be the same a going through all that work?
Old 07-05-2009, 08:48 PM   #24
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Re: 4th order bandpass in the bed....4 12's

Quote: Originally Posted by low&loud
wouldn't a more efficient sub be the same a going through all that work?
i meant one that has a smaller enclosure volume requirement for low end extension, not output efficiency
Old 07-06-2009, 01:47 AM   #25
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Re: 4th order bandpass in the bed....4 12's

ohhh man im gonna be doing this same thing with 4 w6s n a soundstream 6500 n a few days.........i like the build man!!! wish i could hear it
Old 07-06-2009, 05:55 AM   #26
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Re: 4th order bandpass in the bed....4 12's

Quote: Originally Posted by thrice4life44
ohhh man im gonna be doing this same thing with 4 w6s n a soundstream 6500 n a few days.........i like the build man!!! wish i could hear it
psst, go 6th order
Old 07-06-2009, 08:52 PM   #27
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Re: 4th order bandpass in the bed....4 12's

well, had a few minutes after work today to work on my box.... got the box all sealed and test fitted it to the truck, cut the cab/bed, and slid it in and played it 4 a second...... F-N-wow... i like lol But i gotta finish the cuts and run my boot and paint-seal the box and then mount the amp etc,etc.... but it should be play-able by the weekend











AND it lowered the truck too.......lol


Old 07-06-2009, 09:02 PM   #28
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Re: 4th order bandpass in the bed....4 12's

Did you leave any lip on the bed for the boot seal? I don't see any.
Old 07-06-2009, 09:11 PM   #29
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Re: 4th order bandpass in the bed....4 12's

yea... its plenty there just can't see it in the pics.
Old 07-07-2009, 07:22 AM   #30
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Re: 4th order bandpass in the bed....4 12's

I thought you said you built the box so there would be some room by the tail gate? I hate to tell you, but I think your box ate your tail gate!!
Looks awsome!!
Old 07-07-2009, 09:40 PM   #31
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Re: 4th order bandpass in the bed....4 12's

once again, had a few minutes after work to work on the truck..... got to strip out some of the interior, rewire the door and dash speakers, add new rca's, and add new power wire.... gotta clean up the wiring and the cuts and hopefully i can reinstall everything thursday..... and MAYBE make it to Crutchfield's MECA bass off this weekend











Old 07-09-2009, 10:32 PM   #32
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Re: 4th order bandpass in the bed....4 12's

well, worked on it AGAIN tonite, almost finished up. Got the box polyurethaned, got all the wiring done-just gotta clean it up, & made a cover panel, and hopefully tommarow it will be done....





Old 07-09-2009, 11:23 PM   #33
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Re: 4th order bandpass in the bed....4 12's

wow i'm ready for some numbers
Old 07-10-2009, 02:48 AM   #34
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Re: 4th order bandpass in the bed....4 12's

holy crap...that thing is massive. Definitely need to drop the front another inch to level it out.
Old 07-10-2009, 07:52 AM   #35
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Re: 4th order bandpass in the bed....4 12's

judging by his avatar i believe its bagged but i could be wrong
Old 07-10-2009, 01:45 PM   #36
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Re: 4th order bandpass in the bed....4 12's

looks fun
Old 07-10-2009, 01:51 PM   #37
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Re: 4th order bandpass in the bed....4 12's

There is no way thats the same truck nor is it bagged the one in his avatar is layin out and in these pics his bed is black and he's not notched at least thats what it looks like to me. Lets see some numbers!!!
Old 07-10-2009, 02:30 PM   #38
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Re: 4th order bandpass in the bed....4 12's

lol.....no its the same truck, i got rearended so i put the hombre black bed on, however the trick is the pic is doctored..... HOPEFULLY i'll have new pics up tonite with the truck finished btw, it is notched....
Old 07-10-2009, 03:32 PM   #39
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Re: 4th order bandpass in the bed....4 12's

bad ass build man. cant wait to see finished pics.
Old 07-11-2009, 06:00 PM   #40
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Re: 4th order bandpass in the bed....4 12's

well, got the box in.... not all the way finished but enough where i can drive it. Took it to Crutchfield to the MECA bass off and won my class.... It felt pretty good @ 148db @ 32hz with the windows sealed.... but i ran out of alternator and battery so i just gave up till i can get it all fixed up.....

Here's a few pics....









Old 07-11-2009, 09:40 PM   #41
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Re: 4th order bandpass in the bed....4 12's

nice man, congrats
Old 07-11-2009, 10:12 PM   #42
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Re: 4th order bandpass in the bed....4 12's

congrats and holy crap that must be loud
all i want is one 10" sub in my truck
Old 07-12-2009, 05:40 PM   #43
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Re: 4th order bandpass in the bed....4 12's

i was going to say 148 is kind of expected with 4 subs and 1600ish RMS but at 32hz thats pretty crazy
Old 07-12-2009, 07:42 PM   #44
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Re: 4th order bandpass in the bed....4 12's

148 at 32 is pretty damn good, bandpass for ya. Whereas everyone else is 148 at 45 or some gay shit
Old 08-19-2009, 10:57 PM   #45
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Re: 4th order bandpass in the bed....4 12's

holy ****!!!! that thing turned out tits!!!

forgot about this thread till tonight. Any vids??
Old 08-19-2009, 11:07 PM   #46
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Re: 4th order bandpass in the bed....4 12's

Quote: Originally Posted by Speedy2222
holy ****!!!! that thing turned out tits!!!

forgot about this thread till tonight. Any vids??

Post 2052...
http://www.s10forum.com/forum/f27/so...ml#post6416986
Old 08-19-2009, 11:12 PM   #47
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Re: 4th order bandpass in the bed....4 12's

gawd damn that thing is NASTY!!!! i like it
Old 08-19-2009, 11:36 PM   #48
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Re: 4th order bandpass in the bed....4 12's

watched your video, and i think your back window will leak in a few months. my bros back wall don't move that much and now the seal is cracked, its like a steady stream in spots
Old 08-20-2009, 12:56 AM   #49
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Re: 4th order bandpass in the bed....4 12's

nice work man!
Old 08-20-2009, 07:58 AM   #50
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Re: 4th order bandpass in the bed....4 12's

lol....i'll post up some new vids and pics today or tommarow. I'm about to install the 2500-1bd Rockford amp and sell the amp i've got now.....hopefully it'll be a smidge louder...
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