Need help installing amp and sub in RB1 odyssey

Hey guys
I would like to install a sub and amp in my rb1 odyssey, I don't want to change head
unit because i'd like it to be stock, At first it looked very difficult because of how everything is built into the dash etc but then I realised that underneath the front
passenger seat is a amp that powers the speakers, Does anyone here have any experience with audio systems in rb1 odysseys?, I would like to know if it's possible
to use one of the cables coming out of the amp to connect to a LOC converter and straight to my amp?, and if you can then what wires are which?
Also does anyone know any good amp mounting places in the odyssey?
I'm sure some of you guys on these forums must have done an amp install on an odyssey before?
Thanks