Graph Tech PE 0400-00

The Passive Volume Kit lets you connect ghost saddle pickups directly to your 1/4" output jack. The sound of the pickups is rather harsh on its own, so it will not sound like an acoustic guitar without further signal processing outside the guitar. The Passive Kit includes a high-impedance volume pot and other components that help impedance-match your acoustic pickups to your amp, to prevent loss of high frequencies (muffled sound).