AA and DD do make great products but the reason you dont hear about people using those subs in their cars is because of their weight. AA and DD subwoofers are primarily used for live sound. That's why their sub woofers can weigh anywhere from 35 and 75 pounds a piece. Just for comparison the AA 12" Mayhem subwoofer weighs 65lbs (
http://www.ascendantaudio.com/mayhem.php) while the Alpine 12" type E is only 12lbs (
http://www.bestbuy.com/site/olspage....=1199494646811 )