Box and Circuit Woofer Designer frd help needed

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I want save a .frd high pass filter to import in unibox but i don't know what Q means?...and what is stage one and stage two mean? Can someone please explain? Example: Hypex DS2.0 amp plate has this Subsonic Filter: 12 Hz/-3 dB, 24 dB/Octave ...how can i do this in box circuit designer? This is a screenshot from box circuit:

boxcircuit0q10y.jpg

 
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