Cadiillac Rebuild/ True Trunk 4th order bandpass.. Sundown, Pioneer, Soundstream

[nicholasmccabe]

OK guys. The install began yesterday, and will be finished up today. worked for 17 hours straight on theis install. Finally I got burned out at about 11 pm last night. I hope you understand
4th order Bandpass Trunk Box With Ported wall.

3.75 Sealed ( 3 lbs of polyfill included in teh sealed section, hopefully giving me the 20-30% alleged increase in volume according to the sub)
9.24 ported (port tuned to 50 with an insert that willl bring it down to 45, and one for 48.

Sub amp is rubicon 2500.1 for now, nexgt will be ab150.1 or nendo3500.1

Here is part of the shell
http://i1071.photobucket.com/albums/...e/DSC07437.jpg

http://i1071.photobucket.com/albums/...e/DSC07438.jpg
http://i1071.photobucket.com/albums/...e/DSC07439.jpg

[nicholasmccabe]

Double baffle going in
http://i1071.photobucket.com/albums/...e/DSC07487.jpg
http://i1071.photobucket.com/albums/...e/DSC07488.jpg
http://i1071.photobucket.com/albums/...e/DSC07489.jpg
http://i1071.photobucket.com/albums/...e/DSC07490.jpg
http://i1071.photobucket.com/albums/...e/DSC07491.jpg

[nicholasmccabe]

[Flastrongman]

dats a big box, how much port area did you get?

[nicholasmccabe]

dats a big box, how much port area did you get?

i ended up with 16x8 so 128 sqinches. Im hooking up the amps in a little while. How do i post a direct video on here man?? I want you guys to be right there with me when i fire this bish up!!

The reason for the 50 hz tuning, is beacuse the sealed resonance the last time i checked was 50. So we will see how it works out

[Flastrongman]

it should still peak fairly low with 50hz tuning. should move some air hopefully.

[Kangaroux]

i ended up with 16x8 so 128 sqinches. Im hooking up the amps in a little while. How do i post a direct video on here man?? I want you guys to be right there with me when i fire this bish up!!

The reason for the 50 hz tuning, is beacuse the sealed resonance the last time i checked was 50. So we will see how it works out

Goto youtube and upload the vid there, then once it's uploaded click the icon and paste in your youtube url

[TaylorFade]

And host those pics. I'm not clicking on every one of them. Lol.

[nicholasmccabe]

And host those pics. I'm not clicking on every one of them. Lol.

Post #3 . If you click on one of the pictures it will take you to the photo album. Then you can se them all??

Taylorfade, I made the sealed dise 3.75 for the 2-15s , then ripped up 2 cheap motel pillows and put all the poly fill in the sealed side. I inverted the subs so the mototr and magnet are in the ported side. I think my tuning is off a little cause she doesnt dig up the lows like i hoped it would. But around 50-55 it makes your teeth chatter like a muther focker. So what do you think??

[mazdakid]

Now you just need to mess with the port until you have the sound you want.

[nicholasmccabe]

Now you just need to mess with the port until you have the sound you want.

Exactly!!1 thats why i love 4th orders!! I can just shrink to bring tuning down. because the thing is, im rovking a 3:1 ratio or thereabouts afterf all dispplacemtenst. ANy lack of ratio will br brought out by all the powa im running. Planing on selling the 2500.1 and shooting for a 3500.1 . Keep everytihng turned down really low for daily and crank it up for burps and shiit. overall im happy with it. On a 47 hertz burp im pretty sure im around 150 or 151. But i want to do some dam hairtricks and im not there yet. I know i need a lower note to pull hairtricks from a trunk car. like 30-35 hertz to really move some air and with my tuning being 50-52 its not there yet., Gonna shring the por to around 100-110 square inches and tune to 5 > See how low we can go then. Cause like i said, the sealed side has enough to dig upo the lows. Its almost 4.25 in theory with the polyfill. its 3.5-3.75 and tghen i added 2 pillows worth of polyfill top it

[nicholasmccabe]

And host those pics. I'm not clicking on every one of them. Lol.

Looking at the box guys, does anyone have any bracing suggestions?? In was thinking of putting a
1.5" or 2" steel pipe with steel 1/4 inch plate welded to each end. Going from bottom to top. Use self tapping screws and slide the pipe inside and use the self tappers to secure the top and bottom to the inside of the box.

ANy other suggestions would be greatly appreciated, does anyone have any comments on how to make it even better??

Nick

[nicholasmccabe]

Damm guys!!! I didnt realioze that the back of the box was gonna need 2 or 3 layers of mdf to keep from flexing so much. When i burp it, the amp rack basically jumps about an inch off of the back panel. Gonna do some 2x4s running up the back of the box. up and down not side to side. Then mount the amps back to the 2x4s. I knew the soundstream amps are notorious for messing up with too much vibration. SO imma layer the amp rack up a bit. Ive already broken 2 of the mounting feet on the amp

[TaylorFade]

Before tearing stuff up, you could try more polyfill. 1.4lbs per cubic foot. The sealed side plays an important role in low end extension. Just lowering tuning byt altering the port can really hurt your bandwidth.

[nicholasmccabe]

Before tearing stuff up, you could try more polyfill. 1.4lbs per cubic foot. The sealed side plays an important role in low end extension. Just lowering tuning byt altering the port can really hurt your bandwidth.

Too late. I increased the sealed section for 4 cf and still have 2 pillows worth of stuffing in the sealed side. It drought the ported section down to 8.22cf, dropping to 7.5 after woofer and port displpacement. Its still not getting low enough. My new tuning is around 55 hz. Im thinking of doing a slide in port that will bring it down to 45-48. See if thart gets the lows pumping. The overall bandwith is really good. Just not enough down around 32hz and below. I know i have the ratio this time, its gotta be the port is tuned to high. It has to be