help figuring out port on box - 5.5-8.0 / 35-34 hz

[brian84corvette 10+ year member]

my car is 1984 corvette.

I need 5.5 to 8.0 cubes (not including port) for re sx 18

tuned to 35 or 34 hz - as RE sugests...

woofer displaces .22 cubic foot.

max width is 32"

max leingth is 27"

max height at rear is 17.5"

max height at front is 19.5" - and id like to keep it around 18 or so.

if my box ends up being

32 wide / by 27 long / by 17.5 tall rear / by 18" tall front

= 7.31 cubic foot ( using 3/4" wood )

minus sub .22 cu = 7.09 cubic foot

and then factor in a fiew small braces internaly to stop flexing = ? ?

how the heck do I figure out its port - and how much volume port takes up?

ive built a fiew boxes so far - slot ports - and diddnt realley pay attention to how low I was tuning them to - but this time I would like to do it right

now that I have a sub actually worth wile to use in it.

any help is apreciated. - im good with tools, and am a carpenter by trade

so making the box is eazy, just figuring out its tuning is hard on paper for me.

thanks to all in advance for any help you can throw my way.

Click to read more...

 

[SPL Blazer 10+ year member]

Try these links.

This one has a calculator to find your volume... Box calculator

This one has a good port calculator...Port calculator

 

[brian84corvette 10+ year member]

thanks, I think those sites told me to make 34 hz tuning,

make slot port 32" wide like the box is - 4" tall opening of port

and port is to be 15.08" long.

that demention takes up 1.16 cubes of internal space from my 7.09 internal already

leaving me with 5.93 cubes actual space for sub.

re recomends 5.5 to 8.0 - so im on the small side -

do yall think it will do ok in 5.93 cubes - or should I try for more?

my car is verry small inside - if that matters at all.

 

[SPL Blazer 10+ year member]

Less power for a larger enclosure, more power for a smaller one. As long as your within the manufacturer specs you'll be fine.