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How low can you go?
A subwoofer vent tuned to a very low frequency will be very large, just like an organ pipe designed to play a very low tone. The vent contains a volume of air that resonates at the chosen tuning frequency. The lower this frequency, the greater the volume of air required. As the  system is tuned to lower and lower frequencies, eventually a point will be
reached where the vent will be too large to fit within the subwoofer enclosure.

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Earthquake Sound Corporation