Ive been researching on how to build ported enclosures and i know theres are round ported boxes and square ported boxes which do you think is better out of the 2?Also I have 2 JL Subs and I went to their website and looked at the sub enclosure reccomendations and they only have specs for round ports for the enclosures,how do I go about making a round port do I use 3/4"MDF or what?(2)by the port width and diameter specs means 2 ports right.
loud and low
lol the common matterial would be pvc pipe for a round port normally 4in diamiter. the formual is just make sure both the square and round port have the same front open surface area and volume. for a 4 in port the surface area would be 3.1416 x radius squared
tuning the port to lower than the F2 of the sub will cause a loss of damping for the driver, and it can over-excurse, and damage the sub. tune the box to about 34Hz and try that besides, having the box most efficient at 20Hz is silly. That's the lowest you can hear, and your roll off would be completely clipped by the amplifier's subsonic filtering at about 16-20Hz.