i know a good pro audio speaker (97-99 sensitivity) only has a power compression of about 2-3db.
Depends on many variables. If you have the room for a huge ported box, the PA drivers can get VERY loud, enough to destory your hearing. However, PA drivers do NOT play the low low bass as well as a car subwoofer.
Most PA drivers have problems playing 30hz and under save for 18" woofers in giant enclosures, although some newer PA technology provides for sub-bass out of smaller woofers with very high xmax, creative enclosures, and lots of power.
Most car audio subs have sensitivity in the 85-90 range... it will take a LOT more power to play the levels a PA speaker with 97-99 sensitivity can.
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