sir,considering that you will buy SVS PB1000 subwoofer na 10" lang, bili ka na lang ng PB12NSD (its 12"),tutal konti na lang price difference. it definitely produces deeper,lower subsonic sound, better than the pb1000.
try to audition both subs and you will hear the difference. SVS PB12NSD will beat the PB1000 anytime, pound for pound.