EMG ABC Balance Control, Potentiometer, The ABC is an active EQ accessory that eliminates insertion loss and is designed to work with all our non-X series pickups that use a standard passive tone pot, Insertion loss is characterized by a drop in signal strength the nearer you move the balance knob to the middle position, The Active Balance Control (ABC) eliminates this phenomenon and gives a player more reliable and direct control, Knurled shaft (standard length), Solderless connection, Including output socket and battery clip set