Thanks for checkin out my post, im sure you can help


i have a 2001 audi a4 b5 bose

so i got a sub and amp, aftermarket. 2 kicker comp's and a kicker zx300.1 amp I hooked them up and they work fine. So i hooked them up to car battery and a cd player for headphones, and it worked great. So i hooked it up to the little pins ( 2 of em) that stick down off of the stock subs and it played great! is this okay? I read about line level converters(and it seems to make it sound crappy)so i dont want to use those. and about splicing into the line level before the bose amp. My amp has a filter in it so it will only take the "bass" frequencies.
Is it okay to just tie it in right there and disconnect old sub wires so they be quiet. (Right one rattles like when u hold your finger up to a sub, it makes a tap tap tap sound.) and these are good deal and i want more bass. MOARRR BASSS. haha dont ask me why.
so. tie it in right there? or splice into pre amp line levels in the back. Any difference? and any "real reason to use a line level converter, since i tested it plugged right into that sub and it worked.?
Thanks guys your awesome

 

no ideas? im gonna splice it into the line level back speakers (preamp) and just run it from there since my amp seems to work with audis line levels.