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Message: <blockquote data-quote="Str8Up" data-source="post: 686632" data-attributes="member: 557553">All of my rectangle port/vent boxes had the port on the same side as the sub.  But I did have a Q-Logic box where the ports were facing up.  At first I though it was stupid, then I found out that the wave that comes off the back of the sub out of the port is slightly out of phase with the wave off of the front of the sub.  So now I think that porting at the top isn't a bad idea.  Because the time it takes for the wave to hit off the trunk lid is less than the time it takes to hit off the back of the trunk.  Unless your sub is right up on the back of the trunk. So since the wave off the back of the sub is slightly behind the front wave, maybe it helps them to hit at the same time, or closer to it.Dunno..</blockquote>

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