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Your results may vary of course, due to many factors but I'm getting greater than 30db gain in the lowest bass and basically flat response down to 3hz in my Jeep I assume roughly 12db octave gain.I'd go sealed for SQ in a car. Ported always seems to have a rising response with a big boomy peak around tuning. You could pad that down with EQ and have massive headroom. Sealed is smaller and simpler if you aren't worried about rattling other cars license plates as you go by.
