Adding sub/amp to factory Bose

[secondchance]

A question for audio gurus out there;

I have a 94 w/ factory Bose. Ultimately I will be going to after market system. In the meantime, I have an old Alpine mono amp and a 10" sub that's been sitting on the shelf from one of my former rides.

I was thinking about building a enclosed box and tapping off left and right rear factory speaker w/ interface that adjusts cross over htz and hooking up to sub amplifier. I did this with other cars but they were typical 4 ohms system.

Would same hook up work with Bose 2 ohm system?

The same was posted on Audio section of the other forum.