The setup you are pointing to is NOT a 5 channel amp. It is a single channel amplifier to run ONLY the subwoofer it comes with. The connections it has are to allow linking to other subwoofers to allow you to make a bank of subwoofers. It also has high level inputs which would allow you to hook this amplifier up to your speaker level outputs.
This setup has no way of powering your front and rear speakers.