Thoughts on my design?

[bbeljefe]

So in order to reach my desired tuning have all the dimensions basically the same and have a port thats 3.75*12.5*23.25? In order to do that would I need to have the inner part of the port go 13.5in deep then have the port continue at a right angle 9 more inches, giving me a port thats 3.75*12.5*23.25? Also that'd put me around 2.5 net cubes, right? Also thanks for all the help man

You need to add five inches to the depth of the box, making it 23" deep. That will get you to 2.8 cubes. Then, you need a 23.25" long port that's 3" * 12.5 inside measurement. The 3.75" I mentioned is the gross displacement of the port, not the actual port dimension. And yes, you will need to make the port L shaped. And remember that when you're laying out the port inside the box, you measure length through the center of the port, not through one side or the other. In this case, that would be 1.5" from the inside wall of the box.

 

[Braindead]

You need to add five inches to the depth of the box, making it 23" deep. That will get you to 2.8 cubes. Then, you need a 23.25" long port that's 3" * 12.5 inside measurement. The 3.75" I mentioned is the gross displacement of the port, not the actual port dimension. And yes, you will need to make the port L shaped. And remember that when you're laying out the port inside the box, you measure length through the center of the port, not through one side or the other. In this case, that would be 1.5" from the inside wall of the box.

I don't need 2.8 cubes net, only 2.5. 2.5 net is pushing the upper boundaries of what these subs like, so could I just keep the depth where it is and have the short "leg" of the L a little bit longer? I can't give up 5 more inches of depth, I need that room for cargo.

 

[Braindead]

18" deep to be exact

 

[bbeljefe]

Well in that case, the port needs to be 26" long. I'm sorry, I thought your goal was 2.8 cubes...

I've been working on several projects today and only stop by the computer to take a break now and then so I guess I haven't been focused too well.

 

[Braindead]

Well in that case, the port needs to be 26" long. I'm sorry, I thought your goal was 2.8 cubes...
I've been working on several projects today and only stop by the computer to take a break now and then so I guess I haven't been focused too well.

No problem man, you've been tons of help. So to recap, the box will be 25*14*18 with a port that's 3.75*12.5*26 and that'll land me around 2.5 cubes tuned at 35Hz?

Also, how big should I make the cutout for 10's and do I need to use wood glue or can I skip that since im using silicone caulk to seal all the seams?

 

[bbeljefe]

The port should be 3" * 12.5", not 3.75". And please, please, please save yourself a headache and never, ever, ever use silicone caulk on anything but glass and stone.

Silicone does not stick to wood well, contrary to popular belief and it stinks like hell. Use plenty of good quality wood glue (Titebond II or III.. I prefer the latter), make your cuts very accurately and you won't need any sort of caulk on the inside of the box. But... if you want to use caulk, I would use Polyseamseal or plain old painter's caulk, as they are water based, non volatile and, they're made to stick to wood surfaces.