Originally Posted by tylerlovely2006
i was just playing with my design with two 4 inch round ports of 10 inches a peace so that would be a total of 20 inches on winisd right?
Nope it actually does the opposite. 2, 4" ports will require a LONGER port length than 1, 4" port. Just making up numbers, if a 4" port requires a port length of 10", then two 4" ports will each require their own length of 20", or whatever the length is. You don't add the lengths together to be one 40" port, you have two 20" ports. It's all about port cross section and tuning frequency that dictate the length of each individual port. There is no combining lengths.