ok i see the other threads and people are talking about tunning the hz to 16hz and 24hz but i don't know how your doing it because my amp only goes down as low as 50hz????
on a ported box, the volume of the enclosure after driver and port displacement combined with the diameter of the port(s), number of ports, and length of ports will determine the tuned frequency of the box. this is the frequency where the box is most efficient, and therefore, loudest.