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  #1  
Old 06-05-2016, 03:25 PM
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Default 4th order alignment, adulbrich

Hey, I know there's been a lot of crap going on, but I've got a serious question.

Subs are getting shipped this week, and I need to decide on an enclosure for sure. I have 50 more yards of fiberglass coming. I currently have 5 gallons of resin, 25 feet of fiberglass cloth, a sheet of 4'x8' birch plywood, a few 2x4's, screws, and threaded 1" metal pipe. Going to buy 1 or two more sheets of birch and 50 2x4's soon.

I was really stuk on the design of the sealed chamber on the bottom with the ported chamber on top and a top port. Subs would be facing down with the motors up. Would look something like these pictures:






I'm also considering doing 4 of the subs on each side and putting the port in the middle like these pictures:






I know with a shared airspace, subs need less enclosure volume. Would separating them into two sealed chambers instead of one sealed chamber really make a difference on how much sealed volume they would need?

Would either design yield more/less cancellation?

Which would you guys choose and why?

Thanks!
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  #2  
Old 06-05-2016, 03:29 PM
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if the tuning is the same and the port is the correct size.
either way will work the same
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Old 06-05-2016, 03:35 PM
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Quote:
Originally Posted by iamsonic View Post
if the tuning is the same and the port is the correct size.
either way will work the same
Ok, so you don't really think splitting the sealed chambers would make a difference?

Is there either design you would really choose?

I think the first one with a top port would be the easiest. I was just wondering if a center port would be better for daily and demo's
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Old 06-14-2016, 11:16 AM
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I just designed a box like this for 8 XFL 12's:



If I'm not supposed to put this on here like that, please delete it.

You'll probably save space in the box doing it this way.
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Old 06-14-2016, 11:19 AM
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Quote:
Originally Posted by jt_buck View Post
I just designed a box like this for 8 XFL 12's:



If I'm not supposed to put this on here like that, please delete it.

You'll probably save space in the box doing it this way.
Thanks!

Yeah, that's what I had in mind for an enclosure
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Old 06-14-2016, 11:20 AM
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Quote:
Originally Posted by adulbrich View Post
Thanks!

Yeah, that's what I had in mind for an enclosure
Well you know what's up if you need a design lol. One's like this are fun
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Old 06-14-2016, 11:39 AM
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Originally Posted by jt_buck View Post
Well you know what's up if you need a design lol. One's like this are fun
I might text you some time if you have the same number. I can't decide if I want to do.

If I want lows, would I be better off doing a larger sealed section and lower ratio?

I'm thinking something like 10-12 cubes sealed (with lots of polyfill) and 20-26 cubes ported.

Or I could run a much larger sealed section and do a lower ratio. Another option is I could buy 4-8 more subs and do a clamshell sealed wall with no real "ported section" per say

I've got something like 45 cubes gross to work with here. I already have some wood. Have 5 gallons of resin and 55 yards of 55" glass mat.

I have $3k in savings now too after graduation, so supply cost isn't an issue. Could also afford to buy 8 more subs if 16 15's sealed would be the best
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Old 06-14-2016, 11:42 AM
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I've heard some V shaped sealed section 4th's like you posted and believe me... that alignment works very well. I'm thinking about rebuilding my blazer with 12 10's like that with a driver side port.
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Old 06-14-2016, 12:17 PM
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Ok, sweet. I've never done this before, so I'm looking for input on everything.

For lows, would I be better off with the low ratio? That's what I'm thinking, since I'm not chasing numbers and don't really need to play super loud up high
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Old 06-14-2016, 12:56 PM
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You need to make the sealed section proper and then do whatever you can ported. You need to make sure the sealed section resonates where you want it to. You don't need a big ratio to get loud with a 4th order. You do need enough sealed to get low.
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