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Need speakers that can rock with just one watt? You found da place.

Yep.

"A transmission line enclosure with the line closed off at the end (instead of open) is really just a well-braced sealed box."

Quite right. If there is no vent there is no transmission. Likewise, if the vent is restrictive it's not a TL. A TL is by definition non-resonant except at the quarter-wavelength frequency, with stuffing employed in sufficient density to suppress any other resonant peaks arising in the line. If the size of the vent is restrictive, creating a resonant peak below the quarter-wavelength resonance, it's a reflex box, albeit a very long one.


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