As others have said, that is a class D Mono subwoofer amp capable of only low frequency response, and will not be able to run your interior speakers.

With an amp like that you can bridge multiple voice coils together on single or multiple subs and lower your ohm load to achieve more power, but this usually results in frying the amp, unless it is a stout piece of equipment and rated to be bridged down. I used to have an amp that was 2400W of CLEAN power at 1/2 ohm, fully stable. Oh back to the days when I cared not about hearing later in life