I have Fitted my Sub to a NON amp/DSP X5



To get a high level input you need to remove your B-Pillar
behind there at the bottem you will see all the wiring, you will see seperate wires wrapped in the black material.
remove a section of the black material from the smaller of the two bunches of wires and you should find 2 wires (in my case blue with violet strip and blue with grey strip, becasue i used the rear right speaker)

now you have you high level input for your amp, you need a remote on wire

Look in your boot/trunk and on the left where the amp is supposed to be you will see 3 connectors 1 will have a plug in in and the other 2 are left empty ( you may have more kit installed as factory option than me, but mine were empty)
the middle plug has a wire VIOLET with WHITE stripe -this is your remote on

the remote on wire only works on the ignition wire, and not when you just turn on the stereo when the igniton is off

i have a full set of cable identifcation if anyone needs it (only an id for speaker cables)

any questions post here and will do best to answer