The 4th order thread
- Thread starter RangerDangerV2
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RangerDangerV2
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RangerDangerV2 5,000+ posts
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- Thread Starter
- #2
heres the beginning of my current 4th order. I will be making a 12" aero, that is what the ring is for. here is the Fc of my rear chamber. Measured with the vehicle sealed and the loading wall off. Its just about right where I want it to be.
5.3bowtie 10+ year member
CarAudio.com Elite
I will be the first to ask.......Always heard 4th orders, or bandpass boxes in general, had a certain frequency range in the "middle" that would be "dead" with the subs playing fequencies on each side of the "dead zone". Is this true?
Nice looking box btw.
Nice looking box btw.
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RangerDangerV2 5,000+ posts
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- #4
entirely false, actually, its sort of the opposite of that. they will play a bandwidth, but will roll off above and below that bandwidth, however it is a gradual roll off because of the sealed side of the enlcosure.
5.3bowtie 10+ year member
CarAudio.com Elite
Ah ok, so how large of a bandwidth can it hold? Is this dependant uppon drivers, box, both? How does the size of the ported section relative to the size of the sealed section determin box characteristics?
Sorry for all the newb questions, never had or built or played with a 4th order before......
Sorry for all the newb questions, never had or built or played with a 4th order before......
Buck 5,000+ posts
little alien on campus
One thing I see a lot of in people's build thread is using a really stiff, high Fs woofer (i.e. like DD's) in a 4th and using a small sealed portion, creating a very high Fc/Qtc and they get no lows out of it.
Garcia915 10+ year member
Senior VIP Member
Can u guys list a few subs that are 4th order friendly? Do type r's do we'll in 4th orders?
Buck 5,000+ posts
little alien on campus
You want to look for a high Qts and a low Fs, and a higher Vas generally.
Type r's are 4th order friendly.
Type r's are 4th order friendly.
DC level 3's and 4's work great. PSI level 1's and 2's work as well. Depending on power you can get them minus a spider to make them more efficient. Seen two 12" psi level one's with only 1 spider sound really loud on a BC2000d.
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RangerDangerV2 5,000+ posts
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- #10
questions are a great thing! thats why I made this thread!
Most of the people that I have met/seen that do that, are using very large ratios (above 5:1) and are strictly doing it for spl burps.
type rs would be great, soft suspension and low fs, otherwise, The sa series is another favorite.
yup yup. I would like to swap out the sa's for r's just for an experiment, but the r's wouldnt fit in my flush mount lol
5.3bowtie 10+ year member
CarAudio.com Elite
When you say a 5:1 ratio, does that mean the sealed portion or the vented portion is larger?
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RangerDangerV2 5,000+ posts
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- #12
the vented side, which is referred to as the front chamber, is the larger portion. and it is always either the same size, or larger than the sealed portion, which is referred to as the rear chamber. so 5:1 = Front:rear
TaylorFade 10+ year member
I fail.
You could start by explaining the fact that the term "4th order" is a bit of a misnomer since a regular ol' ported box is also a 4th order. Lol.
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RangerDangerV2 5,000+ posts
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- #14
I thought about just filling up the first post with everything that I know, but thats no fun, and too much information at once is hard for some people to comprehend. so please, take it away if you wish.
---------- Post added at 12:09 PM ---------- Previous post was at 12:09 PM ----------
I suppose we could start using the term "4th order BP"
TaylorFade 10+ year member
I fail.
Or single reflex bandpass. But that could include a series tuned "6th" order and quasi 8th too, I suppose.
Anyway... why don't you go into detail about how you arrived at the graph and the tuning for the box you posted for those who don't know. And why we tune to sealed resonance.
And how one might arrive at tuning without a "Woofer Tester."
How ratios affect bandwidth.
How to figure port area. And how tuning or other factors affect said area.
How the size of the sealed chamber affects response.
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