Im getting an Alpine 7998 soon. It has no internal amplifier. I have an Avionixx 400.2 and CDT61A 6.5" components waiting to be installed. So what do you suggest?

I will be getting an 800.2 and a sub for the trunk when I save a little more cash, but I need a temporary setup.

Is there a small stock external amp somewhere in the car that I could devote to the stock sub and let the 400.2's power the CDT's ?

Thanks