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RE: I don't get it.

John is correct, a loudspeaker, sealed box or vented is a resonant system which can be driven internally (as per normal) or externally. In the latter case, just as a diaphragm wall or floor mode does, driving that resonance takes away energy from the room sound pressure .

For a loudspeaker in a room, at bass frequencies, it is measurable but usually small and like he said terminating the speaker (as it is when connected to an amplifier), kills the Q of the resonant absorber.

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