#1
never really heard of a sub connecting this way but with the devices available to me, this is the way i will go. any references?

the sub will be part of a mini studio i'm closely done setting up so quality is important. then again i'm not a millionaire. or a thousandaire for that matter
#3
They make adapters for a reason.
If you look specifically for a subwoofer with RCA, your options are greatly decreased.
..I was watching my death.