4th order confirmation

[MitchellQ]

I designed a 4th order for two 15s and went with a 3:1 ratio.

I'm working with 6ft3 sealed and 18ftft3 ported. My main question is about port area, I originally was going with 15sqin for ever cubic foot of ported section, but then saw someone mention something about the port needing to be half of the cone area?

Much appreciated if someone could help clear this up for me. I have searched the question and that seem to confuse me more.

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[Boomin_tahoe 5,000+ posts]

Sketchup?

 

[MitchellQ]

Sketchup?

I have everything on paper. It's a blow through, sealed section towards the tailgate and ported near the cab of course

 

[Papermaker85 5,000+ posts]

3 to 1 is large.

What woofers are you using. And why on earth are people useing in^2 per cube? This site is becoming ****..

 

[CSCStang]

Are you chasing numbers? And yeah the port per cube doesn't even factor in on a 4th.

Sent from my SCH-I605 using Tapatalk

 

[green draggin]

3:1 ratio will, 9 out of 10 times do better numbers at the expense of a flatter response to say a 2:1 ratio. Usually anything under a 2:1 isn't worth doing because the small amount of gain you get isn't worth the size of the enclosure required. Half of cone area is a good place to start your tuning. Tune between 45-48 hz. If you have a meter you can then start shrinking port area until you stop gaining. Or if you aren't specifically going for numbers and like how it plays as is just leave it.

 

[Papermaker85 5,000+ posts]

Honestly if you going to do that big a box do a 2.1 6th order..

 

[green draggin]

Honestly if you going to do that big a box do a 2.1 6th order..

If you want to spend as much, if not more time tuning, as you did actually building the enclosure. Worth it number and bandwidth wise, yes if tuned properly. Worth it to me personally, time and hassle wise, no.

 

[Papermaker85 5,000+ posts]

If you want to spend as much, if not more time tuning, as you did actually building the enclosure. Worth it number and bandwidth wise, yes if tuned properly. Worth it to me personally, time and hassle wise, no.

They arent stupid hard. It takes a little time but they are definitally louorder than 4th order.

Start big and tuned low..