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Message: <blockquote data-quote="Z1NONLY" data-source="post: 7469888" data-attributes="member: 634086">That has more to do with the logistics of building the box. You could get a big long pipe and stick it into the box with most of the pipe outside of the box and have neither end "flush" with any part of the box. -Forgot about that in the software.Once the air coming from your vent exceeds ~35m/sec it will flutter. Rather than reinforcing the sound you are trying to reproduce, it will start making up it's own noises that detract from the music you want to hear.Lower is generally better on that chart, but sometimes you have to work with higher vent air velocities due to space/packaging constraints. When the line goes dark on that graph, I consider it a "deal-breaker" that I need to fix. Sometimes by going to a smaller sub, or more complex box design that allows for more internal volume.</blockquote>

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