[lDejavul]

If you went straight from the bose amp to your amp then your amp must accept that speaker level outputs. Not all amps can accept that. If your lc2i didn't sound very good it was most likely configuration somewhere either on your amp or the lc2i itself.

If you like the sound of your sub keep it. But 100% you are not getting as much of the bass frequency as the front door subs get. I wish I would have recorded a bass frequency test but I am positive the rear deck is for filler bass and not the whole range. I unplugged my rear deck speakers since they are no use now that I have my JL sub in.