ssteele18's box for OA 15 critique?

[RAM_Designs 5,000+ posts]

With two ports that large, and not very long, I'd bet that the enclosure is tuned nowhere near 32hz. Actually I'm going to check right now, give me a second...

 

[Clifff150 10+ year member]

Good choice on using ssteele. Great guy and great work. My box should be here next week and its sick!!

 

[dbeez 5,000+ posts]

With what I come up with to get to 34hz it would take a total port length of 57.75" so each port would need to be a little over 28" and you ain't got anywhere near that so I say box is way off and no where near big enough to get what you are requiring.

 

[dbeez 5,000+ posts]

I beat you to.it ram

 

[GAMEOVERCCA 10+ year member]

how is that 32hz? and thats gonna be a farter.. 1 port man

 

[RAM_Designs 5,000+ posts]

32" wide x 16" tall x 18" deep = 4.22ft^3 before sub and port displacements.

Two ports, each with 14.5" tall x 3.75" wide x 12"(rounding) worth of displacements = ~.75ft^3

So now we're at 3.47ft^3 without sub displacement. After sub displacement we're at 3.28ft^3.

Now, a 3.28ft^3 box with a pair of 14.5"x3" ports that have a total effective length of ~13" each gives you a tuning in the low 60's.

 

---------- Post added at 09:51 PM ---------- Previous post was at 09:51 PM ----------

 

With what I come up with to get to 34hz it would take a total port length of 57.75" so each port would need to be a little over 28" and you ain't got anywhere near that so I say box is way off and no where near big enough to get what you are requiring.

With dual ports you DO NOT split the port length in half. Each port has to be the calculated length.

 

[Buck 5,000+ posts]

With two ports that large, and not very long, I'd bet that the enclosure is tuned nowhere near 32hz. Actually I'm going to check right now, give me a second...

You're right.

 

[RAM_Designs 5,000+ posts]

Also, good luck making that 14" diameter cutout with a 14.5" tall baffle...

 

[dirtyunclerandy 10+ year member]

I wonder why the box designer hasn't posted in this thread.//content.invisioncic.com/y282845/emoticons/uhoh.gif.c07307dd22ee7e63e22fc8e9c614d1fd.gif

 

[dbeez 5,000+ posts]

Well the calculator I used said for 32hz each port needs to be 68.42"

 

[MisterDeadeye 10+ year member]

@ssteele18

Hi.

 

[ssteele18 10+ year member]

I want my **** done right the first time. ssteele18, who is a very helpful person by the way, gave me these sketches for my new box for the Obsidian 15.
My criteria:

•Height was set at 16' no contest, as any bigger would force me to put my box farther into my trunk, not to mention, it wouldn't be able to get into my trunk!

•Width was set at 32' no contest, as the box would tuck in perfectly into my cars wheel well thingy in my trunk

•Box had to have 2 ports on either side of the sub, for asthetics

•3.4 cubic feet (don't know if that was before or after sub displacment)

•Tuned at 32hz

Here are his final blueprints. I like this box very much! I just wanted community feedback, not because I don't trust ssteele18, I just want everything to be perfect. I got an awesome sub, a decent amp, I just want everything to be perfect for my sub.

My only concern, based on nothing really, is that the combined port area seems big. It seems okay if there was 1 port, but 2 ports of that size, seems...not right? I don't know though, I am basing it really off of other boxes I have seen...for other subs...yea, basically nothing!

SSTEELE18! YOU RAWK

WOAH bro.. Not at all.

 

[Buck 5,000+ posts]

Well the calculator I used said for 32hz each port needs to be 68.42"

I got a number close to that. ~67 inches.

 

[MisterDeadeye 10+ year member]

WOAH bro.. Not at all.

Steeeele, you got some 'splainin' to do!

 

[dbeez 5,000+ posts]

WOAH bro.. Not at all.

Are you saying you didn't send him that.