What happens to the volume of each speaker when two siren speakers are connected in series?

When two siren speakers are connected in series, the total volume will typically decrease. This occurs because connecting speakers in series means that the same electrical current flows through both speakers, which can lead to a reduction in the power that each speaker receives. Each speaker effectively shares the power supplied to the circuit, leading to a diminishment in the overall sound output compared to a single speaker or even to several speakers connected in parallel. The impedance increases when speakers are in series, which can further reduce the power available to each speaker, ultimately resulting in lower sound volume output for the entire system.