[deso]

I have a 2012 Mazda 3 with the Bose stereo/subwoofer. My question is, can you tie in to the existing sub to get signal? If not, would it be possible to tie in to the rear speakers where they plug in at the amp so I won't have to pull my speakers? Also, can I tap in any of the amp wires for the red/blue connections or will I have to pull the radio for sure? Thanks.