Explanation:

Domestic electrical wiring is basically a parallel connection.
Parallel Wiring
Each individual circuit can operate independently of any other circuit in the series due to the way the wiring is installed. A parallel circuit begins with a hot and neutral wire connected to the circuit. The other circuits in the series are connected to each other, neutral wire to neutral wire, and hot wire to hot wire. Regardless of whether a single circuit is broken or nonfunctional, the working circuits in a parallel circuit keep functioning. In audio terms, the wiring is done in such a way that all speakers operate on the same voltage when playing sound.