I don't have a EQ

My stuff is basic I guess...I did mess around with bass and treble settings. It seems better but still not as good as my Nissan

n
Is there an amp out there that is pretty much plug and play for e39 model? I really don't want to mess around with wiring. I used to do that to my other cars...no more though.. I want to keep it stock looking.
What do you guys think about those subs that Bavarian Motorsports are selling. They are 10 inch Infinity subs that suppose to just plug and play to my existing amp. Are they any good? Something like that would make me happy I think.