Gentlemen, I installed this tiny sub
over the weekend. I just used high level input as the sub had the inputs for it. Modified the enclosure and resealed it so I could mount it to the back of the seat, and it sounds great! I have the premium sound with the idrive. Definitely rounds out the system, all passengers raved.
If anyone would like my tips/lessons learned on modifying the sub for mounting it on the back of the seat so that it is still sealed and the seat folds well please PM me.
Thanks for the great DIY!