The silver terminals will match to the white wires in the electrical box, and the brass terminals will match to the black wire. The bare copper wire will match to the green grounding screw.
Your homeowners insurance policy may cover damaged wiring under your dwelling coverage. This may include things like your electrical panel. However, many insurers won't cover certain wiring issues, ...
Most speakers and receivers/amplifiers will have speaker terminals that ... access -- but the electrical connection will be much stronger and more stable than messy raw wire.