I have a Civic sport with standard sound system( 4 speakers with front tweeters). My question is if there is possible to connect an aftermarket active subwoofer to the system. Do the head unit support that and if it does, is there cables pre-mounted back to where subwoofer is located on the premium audio system? I think it would be nice with a little more bass but isnt very keen to start demounting the interior. I´ve been looking through threads about sound system but havent found anything.