EDGE Series have the special concept beyond common design of existing preamps for acoustic guitar. Without mounting screws, EDGE series use Double Inner Clamp system which enables users to install with ease. This mechanism keeps solid wood side of guitar body from cracking caused by installation with screws. FLIP-HOOD Design of panel can save the room for battery case, so it make clean and concise face of panel. All EDGE EQs are applied to EMI process for basic option to reduce hum ideally, and equipped with PHASE switch for anti-feedback. This EQ series enables the color matching with various colors of half transparent and marble finish, compared with other preamps which have the black color only. EDGE-Z is improved model for EDGE-ND. The face is relocated horizontally for easy look of tuner display. Using slide pot for Main volume enables fast controlling and Rotary pot for 4-band Equalizer can make sensitive control. EDGE-CH is Chorus Effect Equalizer Preamp with 4 band Eq. And there is a control for Chorus Rate. The Rate can control SPEED and DEPTH simultaneously. Colour: Black.