I was wondering if someone could guide me full-proof on how to install the current system I have. I had a system before the one I have at the moment so all the wires are there, I just need to know how to wire the speakers in the box as well as properly to the amplifier.

This is what I have:

2 Kenwood 12" KFC-XW1222D Subwoofers
1 Bassworx Box (Part#. HSP212BK)
and finally
1 Kenwood Amplifier KAC-9104D

IF this is possible to guide me through, that would be great. Thank You!

 

You have 4 terminals on the sub. Connect the - from VC1 to the + of VC2. I believe these are the 2 center terminals. Then run the remaining + and - to the corresponding terminals on the amp. It does not matter which set of terminals on the amp because they are wired in parallel internally. Then repeat for the other sub and hook it up to the remaining terminals on your amp. This will give your amp a 2 ohm load at 900 watts RMS.

 

^^^^ What he said LOL. The only thing I see that concerns me is the Bassworx box. Is it the right size for your subs? It doesn't matter how good your subs are, if they are in the wrong box they will not sound good at all. I just spent a long time thinking I had crappy Kenwood subs (KFC-W2505). Turns out they were in the wrong box, made one to specs and there is no comparison now. It turns out they are actually really nice subs.
Nick