Vent Volume??

[Deeznutz]

I am itching to start the subwoofer enclosure for my 2 Old School Coustic CF1244.

I contacted Coustic/MTX and the rep sent me the info packet on PFD. The ported box info I want to use says 1.75cf Tuning is 35Hz and the "vent volume is .13". It calls for a 4x17" port.

How do I transfer this into a slot port measurement?

The enclosure I want to make will look like this, but with the subs inverted. The info sheet does give "Speaker displacement outside the box being 394in^2, 6.5L" for the woofer inverted. So I will have to take this into account when making the box since the volume "Inside the box displacement for ths sub is 474in^2, 7.8L"

A 17" long port would not work with this type of enclosure without some sort of modification. So I rather go slotted.

Any help would be most appreciated.

-Frank

[timc31610]

"1.75cf Tuning is 35Hz and the "vent volume is .13". It calls for a 4x17" port." Is that per sub? The .13 is the displacement of a 4" x 17" aero port. What will your box height be?

[Deeznutz]

its 1.75 per sub. box height will probably be @ 15-17" external height. 17" is at the level of the top of the rear seat.

-Frank

[bkolfo4]

For the pair of subs, you could do 60-80 sqin of port for a slot port.