This is ALL WRONG (in the glossary section too)
Listen up man - A tube is a subwoofer.
A subwoofer is sold in the open market in 2 ways -
As a driver - This can be either used while making your own custom enclosure, or in a Infinite Baffle (tray mount) application
As an Enclosure - where the company makes the enclosure (box) and sells you the entire unit.
Enclosues can be Sealed, ported, bandpass or tube type. All sounding different.
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