What subwoofer do you guys recommended for Bang & Olufsen Olufsen on a F13 M6?
Has anyone used Earthquake?
https://www.amazon.com/gp/product/B06X41HPJJ/
It was recommended from this thread:
http://f15.bimmerpost.com/forums/sho...1400283&page=2
Also, if you changed yours, does it make a big difference?
I don't want a box in the trunk, so I'm leaning toward underseat replacements.