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Message: <blockquote data-quote="BrianChia" data-source="post: 4206373" data-attributes="member: 576132"><p>It is bottoming out... you are running out of useable excursion on the subwoofer when playing low notes at loud volumes By making the vent smaller you are lowering the tuning frequency. The port resonance reduces the excursion of the sub near the tuning frequency. Below the tuning frequency the sub is prone to bottom out--running out of excursion. A box that is tuned too high can lead to this if the program material has frequencies below tuning. If there are air leaks or if the port is too large or placed too close to the rear of the woofer the mechanical power handling may also be reduced, leading to a greater chance of bottoming out. A box that is too big can also unload the subs when too much power is applied. However I doubt that 0.5 cf will make a big difference. You are probably just playing a note that is too low and feeding it too much power.</p></blockquote><p></p>

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