Recent 20++ Pick-Up For Acoustic Guitar. A frequency goes through an amplifier acoustic guitar pickups are very sensitive to feedback, though this varies based on the type of pickup. They pick up the vibrations of the strings and the guitar's top at the saddle position. Whilst it's true many acoustic players will perform in front of a directional mic. The most common type of pickup on electro acoustic guitars is the piezo and can usually be found under the bridge saddle, out of sight.