Specs for 4th order for a CD Omega 15"?

[46panel 10+ year member]

I was thinking 1.5 sealed, 4.0 ported. Tuned to 48.
You say the ported area should be as large as possible, well I'm working with a truck blowthrough and have over 20 cubes available, lol. So I need some sort of realistic figure. I also don't want a huge gain, unless the whole response is going to be flat. This is for daily...

Did you mean 20-30 square inches of port per cube? That seems like a lot, I was told to use around half of the cone area of the sub...

Yes, the larger the ratio the less range but it will be more efficient. So go with the 3:1 ratio if you want to be in the middle. So if you have 20 cubes go with either 1.5 sealed and 4.5 ported or 2 sealed and 6 ported. And for my 20 cubic feet ported I will have about 400" of port area which is 20" per cubic foot. Want the port to be large since that is where all the pressure escapes.

You can go larger or smaller on the ratio, it'll just affect how much gain and how narrow(or wide) the passband is. Everything is give and take.

This ^

 

[hatedonmostly 5,000+ posts]

You can go larger or smaller on the ratio, it'll just affect how much gain and how narrow(or wide) the passband is. Everything is give and take.

I realize this, I don't want too much gain, but I don't want to sacrifice a wide passband, so I don't know if 1:3 will be too much or too little.

 

[galacticmonkey 5,000+ posts]

With this sub, Id stick with ported.

Literally, a $29 Hifonics Hfi 12 on 300w was louder. So was a Sony Xplod 12 on 400w. This was in the 1/1.3 bandpass. This is comparing to the Omega on 2 MB Quart DSC2000.1s strapped at .7.

 

[hatedonmostly 5,000+ posts]

//content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

Seems like 1/1.3 would be small for a 12", but idk.

How about a 6th order?

 

[hatedonmostly 5,000+ posts]

6th order ideas anyone?

 

[rosshimself13 10+ year member]

:fyi:Gmonk is one of the people who design 4th orders around here i would listen to his suggestions

and a 6th order is typically known to have a smaller passband

 

[hatedonmostly 5,000+ posts]

:fyi:Gmonk is one of the people who design 4th orders around here i would listen to his suggestions
and a 6th order is typically known to have a smaller passband

I'm not trying to not listen, but I want doing a normal ported box to be my absolute last option because I don't want to cut out my entire back wall.

 

[rosshimself13 10+ year member]

well your goals and how you are trying to achieve them seem to be a bit unreasonable, you want a very loud system that has a flat response and you dont want a large cut for your blow through..

with a build this size you are looking at about $100-ish everytime you change your box design which could add up quick but thats cheap compared to a wall, so try it in a 4th order if you dont like it you wont be able to use the box again because you will probably have to tear it down..

it may sound great to you so dont let anyone steer you if your willing to risk messing up and re-doing your box