radio installed there is no sound

I had a Tesla style radio installed, and I was adding a loc to the system using the factory sub wires and a wire brushed against a positive speaker terminal. it arched and now I have no sound from any speakers except my aftermarket sub-woofers. I have checked every fuse in the fuse box including the hidden fuse in the inline fuse holder and even the fuse on the back of the radio all are fine. I also pulled the negative battery cable and left off for thirty minutes or so and still nothing. any help would be great.