You see the graph! Let’s try 32 grams in any alignment with a 6.5 inch and have a nice sine wave at any level. You need mass and size for current resonant subwoofers! The subwoofer operating at resonance is sensitive to room modes and enhances them. All speakers act as a microphone and when operating at resonance it is inviting stimulation by external pressures! Most of the participants in this forum are in the sub or not sub! If the current theory was effective everyone would have their bass extended and be happy! That is not what I am reading here! Innovation is necessary to acoustically ground the driver! This reduces vibration and the accumulation of unrelated pressure that modulates the diaphragm! You know the boxy sound everyone complains about! A subwoofer is the pinnacle of this issue!