jpit

I am replacing my stock Bose system with better equipment but will be keeping the stock HU. The new amp has speaker level inputs which I will be using. I know that normally you would use the speaker outputs from the Bose amp and feed them to the speaker level inputs on the new amp. Why can't you use the inputs (coming from the hu) and connect them directly to the new amp bypassing the Bose amp altogether? Would this work? Also, I have searched both thru this site and the service manual for a diagram of the the Bose amp connections but it is a little confusing. Does anyone have that diagram readily available? Thanks.