If two siren speakers are connected in series, the volume of each speaker will:

• A. Remain the same
• B. Increase
• C. Fluctuate
• D. Decrease

Answer: (D)

When two siren speakers are wired in series, the same current flows through both and the supply voltage is split between them. If the speakers are similar, each one ends up with about half the voltage. Since the sound output (volume) depends on the electrical power delivered to each speaker, the reduced voltage means less power for each unit, so both speakers produce less sound. The overall volume from the pair is therefore lower than a single speaker driven directly from the same source. If they were wired in parallel, each would receive the full voltage, so each would tend to play at its normal level, potentially making the total output louder, though the source would have to supply more current.