Adding an amp to a S500?ASAP

im puttin an amp to run some subs of the factory system on a 1999 Merceades S500. i hnkit has th Bose system

how would i get the signal to the amp. do i need an inerface??? which one?

or do i just tap off the back speakers wth a hi-lo converter like you normaly would??

i need to know asap thanks

Does the amp have hgh level inputs ? If so then you can use the rear speakers as the inputs on the amp's high level inputs otherwise you will need a line level converter. Use the power antenna lead as your amp's remote wire or a switched ignition wire ( fused ) .