3" Subwoofer Short Port - Increase your SubBass Response. Increase the bottom end on you sub by fitting this port. You will get better results when used in pairs. Tube Length 1" / 25mm. Our knowledge of Flightcase construction is extensive as we used to manufacture them for 16yrs and we have also been hiring out large sound systems for the past 30yrs so I think we have gained a good bit of knowledge about what works in a sound system as well as what does`nt.
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