Can i tap the rear speakers for my in-line amp connection? I have heard with a bose system, something is different? Is it safe to tap for my amp, that will power my sub in the trunk?

I will start off by saying that the bose system is weird.... I believe that the amp runs at a weird ohm and may not be enough power to run a sub.

I think he is wanting to use the rear speaker as a high level input for an aftermarket amp to power the sub(*). As the Bose system I'm not sure how it is setup being that I've only had my Bonne for 2 weeks now.

I dont really know anything about the bose system, but there is no reason why you cant use the rear speaker wires as high level inputs. They still work the same as a regular speaker regardless of impedance. A high level amp connection shouldnt have very much effect on the way the original steup functions.

you'll want to tap into the wires between the radio and the amp, which is directly below the radio, and right in front of the BOSE DYNAMIC EQUALIZATION emblem. This way you get the cleanest sound.

Its too much work for a little project, if i had a nice head unit, and speaker combo, thats a different story. Otherwise, so long as I can tap the rears without harming anything, that is what I will do. I just have a nice sub and amp laying around, and it should not go to waste.

Take those rear speaker leads from the amp, and hook them up to the head unit. No need to run new wire (although if you have to do a power wire for your new amp you'll need to anyways).

Do the BOSE systems not have the gain control? That is what I'd be worried about, by you moving that gain you would be raising/lowering your input voltage. You turn the gain control up after you have already set your input gain on your amp and you get clipping. Clipping is hard on everything (cars electrical, amp, and sub). Also I'd wate if I was doing it because you wouldn't want to take the already distorted output of the BOSE amp and amplify it to create a even more distorted signal and then play it through you nice sub. Do it right the first time! It will cost less in the long run and you will be happier.

Nope, no GAIN Control -just a BOSE DYNAMIC EQUALIZATION emblem/plaque to fill the hole.

And yes, you'll want to splice into the wiring BEFORE the BOSE amp for a cleaner sound.