I went to listen few sub today,
SVS SB-12NSD - Demo using Ironman 2 but not so impressive, dont feel hit hard and go low.
M&K SB1250 - Demo using Avatar, Feel the sub very fast. But local mark up the price high.
MA RXW12 - Demo using War of the world, stealth. Demo not using good setup. Feel like of not enough punch.
JLAudio F113 - They only demo F113, with Transformer 2, this beast really hit very hard and fast.
Crystal Audio THX-10SUB - Demo using Transformer 2, after listen to F113, really feel this sub no kick. lol.