Verification

[puscifer2 27]

This is my first go at trying to design a ported box so just want to make sure I got the numbers right. This is for a coworker. The sub is a DD 9515. According to their site it should be 3 cu with 48"^2 of port.

Here's what I came up with:

24" x 22" x 15" and the port 3 9/16" x 13 1/2". If I follow the "rules" and make it 20" long it'll be 38ish tune.

I appreciate any input you can give. 15" height is to keep it under the window line and cannot be modified. Other than that any suggestions welcome!

[ssh 924]

You need to give more information. One can't recommend some amount of port area without making reference to the tuning (and to a somewhat lesser extent power).

 

Those dimensions alone are meaningless. Are they internal or external dimensions? If external, what wood thickness are you using? Don't forget to account for displacement of a double baffle if using one, the speakers themselves, bracing, etc. Until we know the volume we can't calculate the port.

[puscifer2 27]

They are external. 3/4 mdf. I did forget to add in for double baffle. I just went to the DD website and looked up the "DD box." They only say for 1 15" it should be 3 cuft with 48"^2 port 20" long. So I just tried to stick to that. The box should be 3.6 ish and then .5 subtracted for port displacement. And another .16 for sub. I had to guess sub displacement because I couldn't find an actual number. Figured that would be somewhat close.

[ssh 924]

So they're suggesting 40hz tuning--kinda shitty. Is this for daily? 0.16 ft^3 per sub for displacement is good.

[puscifer2 27]

Ya just a daily tune. I thought the same thing thing about tuning that high. He wants what they want so...