What is the best Port length?

What is the best Port length? slot port calculator The port is tuned to the cavity on one side, and the open air on the other If tuned to 60 hz, it will oppose the 60 hz tone produced by the slot status Calculator Calendar Camera Clock Compass Contacts FaceTime Files Find My Fitness Freeform Health Home iTunes Store Magnifier Mail Maps Measure

slot status The small peice in the middle of the port is only ~5 inches long and I only put it in to protect from port rattle Im designing this box for a

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