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Erik the Awful

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Also:
Chrome moly requires special welding treatment, pre-heating, etc. The benefit is that it's stronger and lighter than mild steel, so it saves weight. Plan on tig welding it.

ERW tubing has a welded seam down the side. When bending you have to make sure the seam is towards the inside so that in a crash it doesn't split open. BEWARE THAT SOME SANCTIONING BODIES DO NOT ALLOW ERW TUBING!

DOM is the preferred tubing for cages. Its seam is treated after welding to ensure dimensional accuracy, but it also strengthens the seam. You don't have to worry about aligning the seam. Tig is nice, but mig welding works fine on DOM. Never arc weld a cage.

If you do more than one cage, it's worth the month to buy a JD2 tubing bender and bend your own tubing. I'm dreaming of buying one some day.

Our previous BMW used DOM tubing and was mig welded. When it ate the wall at Houston at 70 mph, it ripped the left front control arm out of the frame. The body of the car (convertible!) tweaked so bad the windshield spider-webbed. In the video (sorry, it's not public), you can see the tires from the tire barrier flying. There was absolutely no intrusion into the cab of the car. Our driver walked away and was a little sore from where the harnesses dug in. That is how you want a cage to work.

CORRECTION: Our BMW cage was mig welded, not tig welded. Brain fart.
 
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Wh4t3v3rs

I got real bass!!!!
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I know this has nothing to do with my build..... But I felt like I've made some friends on here and I'd like to share what I do for a living.....
Q
Was limited to 6 hours on the box, so I couldn't do anything to crazy. Just a solid birch box... 2.15 ^3ft gross tuned to 34Hz based on 12 ^2in per cubic foot port.....

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Wh4t3v3rs

I got real bass!!!!
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What kind of subs are those? Why birch for the box? I've always thought MDF was the best material....
Memphis Mojo 6 1/2 inch...

Birch is harder, lighter, and easier to work with (no pilot hole or counter sink)..... it just sucks all beat hell when you have to sand it! Belt sander is a must AND its $65 a sheet....
 

Wh4t3v3rs

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4 6's? What does that sound like?

Sounds like a lot of work lol
We all know that bass is just moving air, and the more you move, the more bass you make. I wanted the bass extension and output of a ported cabinet, and I only had 2 cubic foot. With that amount of air space, ported, I could have done one 10", two 8", or four 6 1/2", and four 6 1/2" has more cone area, in turn will move more air. I'll get the bass of two 10" out it!!!

A little work... a lot of work.... Does it matter when they're floating the bill?? Haha

This job is gonna build my roll cage, so there's a way bigger picture being painted!!!
 

618 Syndicate

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We all know that bass is just moving air, and the more you move, the more bass you make. I wanted the bass extension and output of a ported cabinet, and I only had 2 cubic foot. With that amount of air space, ported, I could have done one 10", two 8", or four 6 1/2", and four 6 1/2" has more cone area, in turn will move more air. I'll get the bass of two 10" out it!!!

A little work... a lot of work.... Does it matter when they're floating the bill?? Haha

This job is gonna build my roll cage, so there's a way bigger picture being painted!!!
I've always assumed (I guess, I don't remember anyone telling me about it...) that since bigger subs have lower frequency responses bigger was better for low end. Guess it would matter less in a tuned port box, but I have always preferred sealed.
 
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