How are you guys integrating a sub into the late model bmw stock systems?

[qwiketz 10+ year member]

I have a 2013 bmw 650 with the b&o system. It sounds great, but there is next to no bass. I'd like to add a sub but it doesn't seem like too many people have done it. The stock system has woofers under each of the front seats. Can I tap into these and run wires to the trunk to the speaker level in of my amp? If I do this, can I run my stock speakers as well as or does the speaker level input put a load on the stock factory amp? Also, is the frequency limited by the stock dsp?

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[imloudek]

The factory amp may be in left rear section of trunk as with most bmws....u may have to remove some carpet trim pieces which are held in by plastic rivets...u can try tapping into the signal from there...what are you trying to do? Just add bass? Or do u think u will upgrade down the road?

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[The Camry]

if you dont get any answers here. go to the bmw forums(not on this site).