Loudspeaker is a commonly used term for an electroacoustic transducer, which converts electrical signals into sound waves. However, there are several synonyms for the word loudspeaker that you might like to consider using in your writing. One such synonym is "speaker," which is often used interchangeably with loudspeaker. Other synonyms include "sound system," "public address system," "PA system," or simply "PA." Additionally, words such as "amplifier," "megaphone," and "horn" can also be used to describe devices that produce loud, amplified sound. Ultimately, the choice of synonym will depend on the context and the specific device being referred to, but this list provides a good starting point for exploring different terms to convey the same or similar meaning.