So if i get 2 alpine type r's with 500 rms each, and a hifonics bxi 1606d amp tied in to both subs, how many rms will the amp be putting out total to both subs? I ask b/c it says 1600 @1ohms and 1100 @2ohms. What is the difference and how do i make sure it is using 2 ohms? THX