attached is a diagram of my box (all dem are inside), alreadt built. the sub is inverted and the cone inside comsumes 0.02ft^3 from the total 1.9567 ft^3 leaving 1.9367 ft^3 before port displacment. the sub will be running 600 watts, and have 3 --3" ports, i belive keeping the port air vel below 30 m/s.....now i pulled the equation from jl's website for port length but cannot seem to get a reasonable length from it (i get something around 5000 inches!) so here are my questions:
1) what is the defining equation for port length? please calulate what my port length should be tuned for 32 hz so i can confirm it when i calulate it with the new equations.
2) i belive the ports are going to be rather long (20+ inches)....so i would like to use 3" pvc, twp questions with this:
--will they rattle inside the box? if so what is a good aproach to prevent this?
-- how do i finish the port at the surface (where you normal see the flared tube)?
any other tips for porting this box will be helpfull, im ported it tommorow or the next day.
1) what is the defining equation for port length? please calulate what my port length should be tuned for 32 hz so i can confirm it when i calulate it with the new equations.
2) i belive the ports are going to be rather long (20+ inches)....so i would like to use 3" pvc, twp questions with this:
--will they rattle inside the box? if so what is a good aproach to prevent this?
-- how do i finish the port at the surface (where you normal see the flared tube)?
any other tips for porting this box will be helpfull, im ported it tommorow or the next day.