Woofer speed/tightness is not related to the size of the driver, it is determined by the inductance (lower is better), which is explained in the article by one of the world's best sub designers:
http://www.adireaudio.com/Files/WooferSpeed.pdf
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No audiophile can ever really ignore the importance of bass.
TT-Revox B791, A/V Receiver-Yamaha Aventage 2010, Blu-Ray- Sony 1000 Universal Player, Amplifier-Cinepro 3K6E Mkii, Fronts- Mirage M3si, Rear-Mirage OM-9, 5 other Mirage surrounds. Subwoofer- Stereo Integrity HST-18 inch w/ 85lb. magnet, 4 1/2 inches of travel.
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