This... you have no port, just a hole....seriosly dude you need to caculate a port to tune your box, it WILL sound 100 times better. with no port your subs have pretty much no dampning what so ever, as said you just have a big leaky sealed box
from the dimensions you have you have a 32 cube box. you port area is way way way to small for you box a port 10x20 and 7" deep will tune you to 30hz and you box will sound a million times better, other than that nice subs and you did a good job on the rest of the box
So after a long winter i am back on the system.I have went with 8.5x24x9 deep.Thanks for all the input.Just wondering what kind of lose the sub beating over half the port.I will be making the hole bigger to fit port then brace as ness.Thanks