What does are you using a slotted port mean?

slot port area calculator   Dan slot link

part 1 how to build a Subwoofer Box Calculate the box volume using cubic ft Port Area Port

Five-port desktop switch with one Gigabit Ethernet port and four SFP+ 10Gbps ports slots, integrated GPS and miniPCI-e slot Compare $ KNOT IoT L = Length of Vent or Port D = Diameter of Vent N = Number of Ports V = Volume of Box F = Tuning Frequency K = End Correction Factor

coin combo slot CALCULATE SUBWOOFER BOX PORT AREA & CONE AREA W COMPARISON INFO The cross-section area of slot should be same as round port However End correction formula must be applied to calculate the