Kicker CVR12

very nice...high five

 

Alright, let me try to get this straight. This box is 43" wide, 14" tall, 24" deep (6.75 ft3). Then it has 2 ports flushed mounted that are 6" inner diameter and are 9" long.

I'm not sure if I understood that table, but if it's saying they're 6.25" outter diameter then that's [{3.125 squared (pi)}{8.25}]/1728... times 2, so = .29 ft3 of port displacement... minus another .16 ft3 for sub displacement.

So a grand total of 6.3 ft3 tuned to 40 Hz? Is that what those graphs are showing? ...oddly enough WinISD beta is telling me 6.3 cubes tuned to 40 Hz should have two 6" ports that are 10.43" long not 9"...

 

My calculator says the port needs to be 8.95-inches long.

But listen, I always add a half inch to my ports, what the hey, better slightly low than slightly high. (if there is any difference at 1/2-inch)

 

Alright. This is what WinISD beta is showing me. Does this look like the box I should build?

 

Nice and round at the top, good F3 and your gain is great. I would say that you have a winner there

 

Alright sweet. So how do I attach these round ports inside the MDF securely?

 

I trace the outer edge of the port...then jigsaw it out on the inner line..then sand it down so it fits nice and tight. Then glue that bitch in and caulk around the base. Works perfectly

Unless you can find a router

 

That's it? Even though its going to be hanging out 8.25"? lol

 

Well I don't think this is going to work.. Home Depot only sells 4" and Lowes only sells 6" by the 10 foot... how bout like four 4" ports? lol

Or I could do just 1 big slot vent.

 

Four 4-inch ports will have slightly less cross sectional area than two 6-inch ports. So the length of the ports would need to be ajusted

For Four 4-inch ports the length will need to be between 7.5 and 8 inches

 

Do you think I'd be better off just doing 1 big slot port?

 

One large slot port would be easier to deal with and in my opinion simplify construction of the box.

Two 6-inch round ports will have a cross sectional area of 56.5 square inches. So you need a rectangular port where the height times the width equals something really close to 56.5. (anywhere between 54 and 58 should work)

Your length for a cross sectional area of 56.5 will be around 9 - 9.5 inches

 

How bout 12.5" (whole height of box) x 4.5"= 56.25 sq. inches of port area?

 

Perfect, that will work with no problem.

 

I have a PVC store about 200 yards from my house

Any size or length I need. And I have about 10 feet of 4 inch pvc left over from my dad

 

Okay sounds good. So are the box dimensions still 43" wide, 14" tall, and 24" deep? Or has the new slot port increased port displacement too much, no longer giving me 6.3 cubes?

 

What's the port length?