Compact preamp system for electro-acoustic guitar that features a 4-band EQ and a built-in tuner for 6- or 7-string guitars with mute-function and automatic/manual mode. It can be controlled by Volume, Bass, Middle, Treble and Presence controls and Power and Not switches. The preamp system is supplied with 9-V battery holder with jack plug and XLR-output but without pickup. Installation dimensions for preamp: approx. 46.5 x 46.5 mm. Installation dimension for battery holder: approx. 39 x 48 mm.