First 4th order! (Bare with me)

[Kent535 25]

So going from my current setup to something more extravagant should spark your interest.

Wanting to go with (4) SA-8 V.2's in a 4th order box with a 2:1 ratio.

 

From what ive gathered so far on reading..

 

 *  Speakers facing sealed chamber(better cooling&so you can smell the coils if needed)

 * 15^3 inches of port area PER cubic feet of sealed chamber

 * The shorter the port the better

 * Ported chamber tuned to around 45-50 hz.

 

 

Here is what ive come up with on Sketchup so far.

Sketch is not to scale.

Came up with

         - 2.6^3 feet in ported chamber and...

         - 1.3^3 feet in sealed chamber.

 

Would love some input or constructive criticism/ advice and help since this is my first 4th order

[smashedz28 110]

Why a 4th? What vehicle will this go in?

[Kent535 25]

Why a 4th? What vehicle will this go in?

Im going for SPL on daily music. It will be going in an 08 Lexus ES350

[ssh 924]

Everything you described is a recipe for poor results. Its absolutely no different then walking down the street and asking someone "hey pick two numbers" "okay good i got my chamber volumes down, just gotta get a number for porr area and length and ill be good to go."

Sorry if that comes across as being harsh, but i want it to be made clear.

[Kent535 25]

Everything you described is a recipe for poor results. Its absolutely no different then walking down the street and asking someone "hey pick two numbers" "okay good i got my chamber volumes down, just gotta get a number for porr area and length and ill be good to go."

Sorry if that comes across as being harsh, but i want it to be made clear.

Where do you recommend i start then?

im lost now :?

[ssh 924]

I would use a ported enclosure and I probably wouldn't use 4 8"s for the sake of cost (2 12s would have a little more cone area and cost around half as much), but perhaps the 8s fit better in the trunk?

 

4th order bandpass won't offer any more output over a ported enclosure (okay it might but it'll be a tiny amount more over a limited frequency range) and it'll have have a shorter bandwidth.

 

As to the bullet points you made above: there is no relationship between port area and enclosure volume, there is no correct "ratio" for chamber volumes, and shortening the port length merely raises the tuning frequency--which could be good or bad, but without context is meaningless advice.

[///M5 2,833]

Everything about the build you've described so far is setup for failure. Listen to SSH. Seriously.

[Fi 4 life 0]

I would listen to them.

[Kent535 25]

Decided to just go Ported since apparently my numbers were off. So here is what i have so far.

Should get to wrapping in vinyl tomorrow which will match my interior.

 

[antoinez28 62]

Looks good

[ssh 924]

Got some good wood working skills, I'm jealous.

[Kent535 25]

Got some good wood working skills, I'm jealous.

Why thank you! they have defiantly gotten better since my early days of enclosure building that's for sure.

[Kent535 25]

Picture update. Ordered the other 3 SA-8's and Got the box wrapped and the subs wired up. Heres the final result. Before you mention the "Staples" comment, save it. I've already heard it.

 

[Kent535 25]

Also made a temporary amp rack until i get my other amps and batteries.

Have to say tho, those 6 SA-8's slam on that SAZ-3500D even tho it gets pretty hot since its on .7ohms..

 

Edited October 11, 2014 by Kent

[antoinez28 62]

Nobody can sit back there unless they want to laydown...I wanted some sa subs but pockets ain't deep yet...nice build

[jcarter1885 995]

Bro those staples though :

[Notorious97200 339]

Why didn't you take the backseat out and lay the box on the floor ? Nobody can sit in the back.

You could fire the subs through the cabin, from the trunk.

 

How do you like it now ?

[Kent535 25]

Why didn't you take the backseat out and lay the box on the floor ? Nobody can sit in the back.

You could fire the subs through the cabin, from the trunk.

 

How do you like it now ?

I wanted to keep the backseat in for aesthetic purposes and to keep it looking nice. My next build will most likely be a 4th order box in the trunk with the port blowing through the cabin pass through that is in between the back seats. Overall i love the current setup i have now. I was very disappointed when i tried it out after finishing it. But then after putting the seaports, the SA-8's came alive. Then again the box was calculated to be ported to begin with.. guess i just wanted to hear them asap before the aeroports arrived in the mail.

[gao1 0]

Buddy if mine had 2 10 in 4th order set up the way you describe in an integra 4dr. Loud as hell and would shake am/pm windows like crazy. Seal side set to mfg seal spec. Ported side set to 2:1 @ 45hz. Plays everything.

[///M5 2,833]

Buddy if mine had 2 10 in 4th order set up the way you describe in an integra 4dr. Loud as hell and would shake am/pm windows like crazy. Seal side set to mfg seal spec. Ported side set to 2:1 @ 45hz. Plays everything.

your buddies a moron that drink dipshit koolaid. Absolutely retarded way to "design" a box.

[ssh 924]

 

Buddy if mine had 2 10 in 4th order set up the way you describe in an integra 4dr. Loud as hell and would shake am/pm windows like crazy. Seal side set to mfg seal spec. Ported side set to 2:1 @ 45hz. Plays everything.

your buddies a moron that drink dipshit koolaid. Absolutely retarded way to "design" a box.

 

Yeah 2:1 ratio only works for quick trips. 3:1 is for am/pm.