Fishman Prefix Premium Blend Preamp and Pickup, Narrow Format State-of-the-art onboard preamp featuring a gooseneck-style internal microphone with apickup/mic blending slider Volume control as well as bass, treble, and awide-range semi-parametric EQ to isolatecertain frequencies and boost or cut themas needed Feedback-fighting notch filter and phase switch Onboard chromatic tuner can be used withoutplugging in the guitar System includes an Acoustic MatrixUndersaddle Pickup and Switchjack StereoEndpin Jack