Port Question
#2
Port area has virtually zero to do with box volume. Port area is governed mostly by cone displacement and then way down in second place, tuning frequency.
But to answer your question - treat round ports and rectangular vents the same way.
But to answer your question - treat round ports and rectangular vents the same way.
#4
#5
but its still common practice/common sense not to go lower than 12 sq in of port per cubic foot unless you enjoy port noise
#8
^ Exactly. And to expand on that, what is making the noise? The velocity of the air.
what affects the velocity? The volume of air forcing it's way through the opening.
what dictates the volume of air? The displacement over time of the driver.
Where does the box volume come in? nowhere.
I understand where this 'rule of thumb' came from but the theory behind it is bad - I suspect someone tried to really dumb box theory down for people and in doing so can cause more harm than good.
what affects the velocity? The volume of air forcing it's way through the opening.
what dictates the volume of air? The displacement over time of the driver.
Where does the box volume come in? nowhere.
I understand where this 'rule of thumb' came from but the theory behind it is bad - I suspect someone tried to really dumb box theory down for people and in doing so can cause more harm than good.
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Blinddemonz
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06-15-2004 12:34 AM