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In Reply to: RE: Absolute Sound/ Bonsai posted by John Atkinson on March 12, 2017 at 10:16:09
How could that be the case for a sealed speaker enclosure? If a room has, say, one other set of 2-way speakers (even with a small port on the back of 'em) somewhere in the room how much effect could slight vibrations of their static drivers have on the sound when another pair of speakers is being demo'd? Seems to me that its very unlikely that it'd make much difference.
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.
Can you point me towards somewhere that shows the measurements you referred to?
I don't think i ever saved any of them, a problem taking a lot of measurements i guess.
> How could that be the case for a sealed speaker enclosure?
A sealed speaker is still a tuned resonance system. Note the difference
when you try to move your speaker's cone with the terminals floating or
> Seems to me that its very unlikely that it'd make much difference.
In your opinion, but not those of others, of course. BTW, the terminals
shorting is not as effective for midrange units and tweeters, as these
often have a series resistor in their feed from the crossover.
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