Final answer:
A 3-way speaker uses a crossover to direct high and low frequencies to tweeters and woofers respectively, ensuring optimal sound reproduction. The correct option is a).
Step-by-step explanation:
The device that a 3-way speaker uses to send the correct frequencies to the correct speaker is called a crossover. The purpose of a crossover is to ensure that different frequency bands are directed to the appropriate drivers within the speaker system.
For instance, high frequencies or short wavelengths are reproduced more accurately by tweeters, and low frequencies or long wavelengths are better handled by woofers. This separation enhances the overall sound quality and ensures that each speaker component operates within its optimal frequency range. Option a) is the correct one.