Ok, so my box cft after subs is right around 3cft. i can build it less if need be. The subs are re pro sr series. ill list the specs. The question im after is, im porting it to run about 31-32 hz. i cannot decide on what port size to use or how many. im thinking either two 3" or one 4" possibly two 4". Ive never designed a ported box so im not 100% on how to tune the ports to it. they recomend 1cft per sub at 35hz but i want it to still go low but have a lot of punch to the bass.
a member on here recomended 2.5 cft and i can build from 1cft for both all the way up to 3cft.
Electrical Q Value -Qes 0.39
Mechanical Q Value -Qms 5.5
Total Speaker Q Value -Qts 0.36
Free Air Resonance -Fs 25.3 Hz
Equivalent Compliance -Vas 31 liters
One-Way, Linear Excursion -Xmax 18 mm
Efficiency -SPL 1W/1m 85.3 dB SPL
Effective Piston Area -Sd 310 cm^2
DC Resistance -Re 1.8 ohm
Nominal Impedance -Znom Dual 2 or 4 ohm
Thermal Power Handling -Pe(RMS) 320W
Force Factor -Bl 14.35