looking for circuit to replace a home cinema amplifier

Hi

my home cinema is breaking down (it's an LG HX506DI which is blocked at startup with the message: "please wait") ... so I have in my pocession two speakers and a subwoofer that I would like re-use with another amplifier that I plan to buy used ... in the meantime I wonder if it is not possible to make an amplifier myself with the constraint: two kinds for the two speakers and one output for the subwoofer, a 2.1 input ...

Thanks