Semi-Acoustic: These guitars have a hollow body (usually with an archtop*) fitted with one or more magnetic pickups. Played unplugged, you get an acoustic sound but at a lower volume than a fully acoustic guitar. Amplified, these guitars sound like an electric guitar but are more open and warm .One of the most remarkable qualities of the acoustic guitar is its versatility in producing different sounds. The acoustic guitar's sound can be warm, bright, or mellow, depending on the player's technique, the type of wood used, and the strings