I know BSW is still working on a kit for the E70 model....

but has anyone done a DIY job of adding a second 2-4 channel amp to the existing stock amp?

I didn't opt for the premium sound system which would have added some speakers in the rear trunk area...

Now i want to add one or two 12inch speakers/subwoofers (or whatever) to the rear and need to daisy chain another amp in order to accomodate the extra speakers...

I'm told if i get a 2 channel amp i could connect it to the stock system and it should be fine...

need some advise/info on the proper way of doing this...

note: I'm not looking to replace the stock amp (which is a descent 7 channel 205 watt amp)

just need to be able to add two more speakers without taking RMS power from the stock speakers..

any ideas?? any recommendations on amp/speakers to buy??

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2012 X5 50i M-Sport
2014 X3 35i M-Sport