L.R. Baggs M1 Active Body Sensitive Soundhole Magnetic Accoustic Guitar Pickup
 
The patented magnetic soundhole pickups are for players who love big acoustic tone with high feedback resistance on any stage. Combining the natural characteristics of your guitar’s soundboard with a punchy string attack, the M1 Active’s body-sensitive design provides realism while cutting through a loud mix. The plug-and-play design has built-in electronics with audiophile-grade circuitry for that sweet and pure acoustic sound we are known for. The internal electronics boost the pickup’s output for a full and direct signal to any acoustic amplifier or P.A. system, eliminating the need for any external preamps. The addition of a built-in volume control provides the player quick access for any performance.

Also available in a completely passive design.