4th order bandpass boxes

I used WinISD alpha software to design a 4th order bandpass box... I've got the results on paper what I want but the tuned freqencies between the chambers is 16Hz apart... will this be a problem? The front chamber will have 2x 12" by 4" by 5" slot ports OR 6x 4" diameter x 5.92" vents. My main question is, will the difference of frequency between the chambers make the box not work? because it looks great on paper. Also the program takes into account vent end correction. If im just using pvc piping what alignment should I use?

did you find the tuning frequency per chamber or for the box as a whole?

what do you mean 16Hz apart?? a 4th order bandpass only has ONE tuning frequency

The rear chamber or "sealed" part is tuned 16Hz lower than the front "vented" chamber which is tuned at 80Hz. The graph doesn't look like your typical 4th order graph but it does reflect what I would like to get out of my subs based on the music I listen to.

a sealed chamber cannot have a tuning frequency as there is no port to tune i think you accidentally chose the 6th order bandpass...which in WinISD is a parallel tuned bandpass model

I know what you mean but the chamber is tuned, not manually of course because there is no vent to adjust but by the amount of air space you give the chamber.

man... read my posts. the rear chamber is 64hz, and the front chamber with the port is 80hz, together the box as a whole will generate some mean notes as long as theres not something I don't know about yet... plus I've built plenty of plain sealed and vented and I want to step it up. So if anyone has built these in the past and has some good tips I'd like to know them. Also, to hopefully rid the box of the noise above 120hz typical of bandpass boxes does anyone know where I can get low passes that go inline with the rca cables for cheap? I know crutchfield has them but they're 20 a pair.

I think you don't know what you are talking about 4th order boxes are only single reflex...meaning only one ported chamber.

------------- 1           1   <-- this (sealed) chamber has a frequency 1    64Hz   1       inherent to its air volume 1           1 1---Sub-----1 1           1   <-- this chamber with its vent also has a frequency 1     -------       due to the air volume of its chamber + vent air 1     -------       volume 1 80Hz     1 1-----------1   They are at different frequencies. Is this ok? Im gettin tired of messin with it anyway, the bass reflex design is only about 8-10 db higher than that of a plain sealed chamber.