Question: what is the difference between woofer and instrumental speaker?
Answer: A woofer or bass speaker is a technical term for loudspeaker driver designed to produce low frequency sounds, typically from 50 Hz up to 1000 Hz. The name is from the onomatopoeic English word for a dog's bark, "woof" (in contrast to the name used for loudspeakers designed to reproduce high-frequency sounds, tweeter).