My W6 is way under-powered, pre-amp??
I had my 12" W6 installed a while back on my M3 but it barely hit and I was told I needed an additional pre-amp installed (in additional to the sub amp) because of the surround sound system. What EXACTLY do I need so I can finally get this thing right??
Anyone in the L.A. area able to recommend a good shop to do this install? Everything is already wired..
2015 F82 M4 - Yas Marina
2010 E92 M3 - Alpine White - Sold
2008 G37S Coupe - Sold