Ok , I've made a box that is 11 1/4 qubic feet , running 2x vibe 15' (2800w) wot size turbo ports I need, was thinking 4'
just ran your subs and box through bass box pro and it says that you were to have 2 4inch ports they would need to be 22.27mm in length.
thats tuned to 34hz with no box fill.
and thats 11.25 qubic feet INTERNAL volume.
what are the actual dimensions of your box? i may be able to get a print out of perfromance.
Firstly, what model subs do you have? I wouldn't advise porting an enclosure at all unless the speakers are designed for it, or unless it says in the literature that it's fine.
Yes, porting an enclosure will lead to a greater frequency range, but at a cost of clarity and with more power being required. As there is less air to work against (due to it flowing in/out of the port) tones are "muddier", and speaker life expectancy is reduced (as the cone can flex beyond the parameters it was designed for).
Sealed boxes mean deeper bass, the air acts as a bumper stopping excess cone travel, and it will produce clearer tones.
Obviously if the sub is designed for a ported enclosure then that negates the issues, but if it's not then your solution may be a bandpass enclosure like the third picture here...
NOW - Sapphire Black 3dr Astra G
THEN - Glacier White 2.0Di Estate - 136bhp 1.6 Pineapple Yellow Mk3 - Flame Red 2.0Di Van - Chianti Red 1.8 Coupe - Star Silver 2.2 Zafira - Flame Red 2.2 Linea Rossa Coupe - Titan Gold 1.8 Coupe
9 Years, 7 Astras, 1 Zafira, No Regrets.
So having no ports is ok I thought that u Medes then so the excess air can be released from box.
I'm running 2 x 15' vibe spaces off a vine monobox 2800w amp and Yh the interiour volume is 11.25 qubic feet. If I remember rightly the dimensions are 3foot by 2.5 foot by 1.5 foot