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Old 09-05-2012, 03:48 PM
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Default Trying to get into 4th orders...

So I've been ding a little reading on 4th orders and they don't seem quite as complicated as i originally thought so I figured I'd try to design one and see if I was on the right path or completely off the trail. opinions gladly welcomed.
PS: I'm just trying to get the concepts down. I don't plan on attempting one for a few months lol

Total Dimensions
D: 40.75"
W: 48"
H: 24"
Sealed Dimensions
D: 14"
W: 48"
H: 24"
Ported Dimensions
D: 26.75"
W: 48"
H: 24"
port: L:15"
W: 15"
H: 20"
I attached a few renders i tried in AutoCad but I'm no professional so don't expect too much!
Attached Images
File Type: jpg 4th order.jpg (6.1 KB, 42 views)
File Type: jpg 4th order 2.jpg (6.4 KB, 40 views)
File Type: jpg 4th 3.jpg (6.5 KB, 38 views)
File Type: jpg top maybe.jpg (4.9 KB, 34 views)
File Type: jpg maybe.jpg (6.6 KB, 36 views)
File Type: jpg 4th order maybe 2.jpg (6.2 KB, 37 views)
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Old 09-05-2012, 06:45 PM
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It looks like you are well on your way! Fourth orders are pretty easy as long as you are dilligent about calculating or measuring your airspace and port numbers. Something, however, tells me that you will have no problem with that. In fact, does the fact that you have AutoCAD imply that you are either an engineer or student?

Just build it....
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Old 09-05-2012, 07:38 PM
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What size subs? I'm assuming those are 12"s because of the dimensions you listed. If so...that rear (sealed) chamber is probably way too big. Bring it down by a couple ft^3 and add that space to the front (vented chamber). That should allow you to shorten the port a bit as well.

Note that those things will increase efficiency within the bandpass. The box you modeled will work very well and will be flatter over a broader spectrum of frequencies (mainly on the upper end), but I assume that you didn't design a 30 ft^3 enclosure with four drivers for perfect SQ, lol.
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Old 09-05-2012, 11:19 PM
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Quote:
Originally Posted by Audiointelligent View Post
It looks like you are well on your way! Fourth orders are pretty easy as long as you are dilligent about calculating or measuring your airspace and port numbers. Something, however, tells me that you will have no problem with that. In fact, does the fact that you have AutoCAD imply that you are either an engineer or student?

Just build it....
Lol yeah i graduated back in december of last year. I'm and Industrial Tech major and we only took a basic intro class in CAD so I'm trying to teach myself how to use more of it cause I like it. I want to just hop in and start building but when i graduated I immediately started a new job in a new city so I'm living in an apartment w/ no tools/garage/yard/etc. but I'm going to find a way to get some practice in as soon as possible.

Quote:
Originally Posted by SPLEclipse View Post
What size subs? I'm assuming those are 12"s because of the dimensions you listed. If so...that rear (sealed) chamber is probably way too big. Bring it down by a couple ft^3 and add that space to the front (vented chamber). That should allow you to shorten the port a bit as well.

Note that those things will increase efficiency within the bandpass. The box you modeled will work very well and will be flatter over a broader spectrum of frequencies (mainly on the upper end), but I assume that you didn't design a 30 ft^3 enclosure with four drivers for perfect SQ, lol.
Thanks. I'm going to keep playing with measurements and such. I just wanted to be sure I was going in the right direction before I got too in depth with it.
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