4th order bandpass port help

[LMJexploder]

im building a 4th order but not sure on the port size im using 2 alpine type R 12"s
The ported chamber (subs facing the sealed chamber)
external dimensions are 16"(H) x 41"(W) x 19"(D) that dosent include the sealed chamber dimensions
i was gonna use 4 -- 4" x 6" areoports does this sound right?
or would a slot port be a better way to go?

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[THATpurpleKUSH 5,000+ posts]

Use a single port, not multiple small ports. A single 6 or 8 inch would be fine.

 

[mr roo]

On your 4th what port tuning are you looking?

 

[LMJexploder]

On your 4th what port tuning are you looking?

45 to 50Hz

 

[mr roo]

I asked because I have a type r 12 laying around and thought of a 4th order. All my previous 4th orders had higher tuning to try and get bandwidth but some gain over sealed.