ported box for 2 12 bazooka RSW1224DVC

We don't see the box your sub came in, just the manual.  First, how are you wiring those subs...they are dual 4 ohm DVC.  Like option 2 below for a 4 ohm load on the amp?

Option 2-Coils in series, subs in parallel:

I looked at the manual and it shows a Qes value of .51 if coils are series-wired.  Trying to see what works in a design program for those subs.  The EBP comes out to 62, which is okay for either sealed or ported, but a large enclosure needed for ported.  The best sound and lowest bass extension for the two subs is in a box 9.5 cubic ft (!!!) with a round port 4"  x 2.27".  Box is tuned to 26 Hz.  Other than that, you could get by with a box 5 cu. ft., tuned to 32 Hz, with one round port 4" x 3.67".  I used WinISD for those numbers, with the parameters lifted from the manual.

The second one, with the smaller enclosure, gives a bump to frequencies in the 50 Hz area.  So it you use that size, don't add any bass boost (if you were going to).  The volumes do not include driver displacement or port area, which have to be added.

If space is a big issue, you can build the enclosure to 4 ft^3 (and add drivers displacement and port area) as they show in the manual, with one port as shown 4"X 8.35", with the trade-off being in the low frequency response.  The lows will drop off quickly below about 50 Hz.

Use what you have space for, and look into some of the box designing programs to help you do it.  Nobody should ever build a ported enclosure on anyone's recommendation alone, including the manufacturer's (as you can see, sometimes it's conflicting), unless you also look at possibilities by using a design program.

You might want to look at using a larger port opening than I showed here, too.  The length would be longer if the opening is bigger.

The only thing I can say at this point is go with what you started.  I'll just recommend that you make it one chamber instead of two for ported, because your port sizes will take up much more space in the chambers if you have to use two ports.  I think it will sound better and be more manageable sealed with the size you have now.  No need to fill it to make it smaller, but if you go sealed go ahead and put in the center divider for a two-chamber box.  If you've got enough good power going to those subs, you'll get the bass you want for all types of music.

Bottom line is:  1.  Ported box building takes careful homework before beginning construction.  2.  The specs for those subs tend more to sealed, mainly because they need a large enclosure for ported, with large porting.  3.  The space you have to work with is too small to work out the best sound if you go ported.

Some tools and info links:  http://www.carstereo.com/help2/Articles.cfm?id=31

http://www.carstereo.com/help2/Articles.cfm

http://www.linearteam.dk/default.aspx?pageid=newdriver

http://www.linearteam.dk/default.aspx?download=winisdpro

http://www.bcae1.com/

https://www.the12volt.com/installbay/search.asp?KW=ported&SM=1&SI=TC&FM=2&OB=1&Submit=Start+Search