Kloost,

How/where did you mount the amplifier? It appears to be behind the seat, which means removal of the seat back. Just courious about the details of that step.

Yep, behind the seat. Removal can be a b!tch too- at least in my case. You have to slide your hands between the seat and bottom cushion and release these little plastic clips that like to remain right where they are. Once you do it a couple of times it gets easier.