by dual 2ohm? recommended amp? http://www.amazon.com/MTX-Square-TR5512X2D-Vented-Enclosure/dp/B00318EFT0/ref=sr_1_1?ie=UTF8&qid=1292218558&sr=8-1 << thats what im looking to buy. wondering what it means by dual 2 ohm? does that = 4 ohm or what? recommend a specific amp for me? would the amp at this link http://www.crutchfield.com/p_500MRP1000/Alpine-MRP-M1000.html?tp=35834 power both subs? any additional info i should know? thanks