u003cstrongu003eAnswer:u003c/strongu003e A guitar amplifier is used to pick up the signal from whatever guitar you're playing. This could be an electric-acoustic guitar, a bass guitar, or an electric guitar. Picking up the signal will allow the amplifier to produce a louder sound. And the increased volume is delivered through at least one, if not more, loudspeaker. In the majority of setups, you'll find that the louder speaker is in a cabinet made out of wood.