amp is getting mailed next business day (tuesday). JBL 600.1. bought it off ebay for cheap . saved myself just over $400 . but im probably going to buy either 1 or 2 alpine type s 12" subs. jbl 600.1 600w max @ 2 ohms 300w max @ 4 ohms alpine type s - 600w max 1241 model - single voice coil, connects in 2 ohms 1241d model - dual voice coil, connects in 4 ohms, 2 ohms if two are connected which would be better to buy? a single sub or two subs? and whats the difference between a single or dual voice coil? does it make much, or any difference?