going to build my first ported box using a flared aero port. i was wondering if 1 - 4" is enough for 2 SA-10s in 2.5ft^3 tuned to 32hz. i've used winisd to plot everything and it comes up around 10.25" for the length of the aero port. psp-inc shows around 10.30". box dimension is 35x15x13.