The Ischell contact pickup is the basic system for a double bass (solid top only), an instrument that is often faced with high levels on stage. It is known for its acoustic fidelity, its resistance to feedback, and its ease of use with amplifiers. The X-Jack model is appreciated by double bassists for its jack and XLR outputs available simultaneously, its operation on 9v battery and phantom and its installation without intervention on the instrument... The microphone is placed under the high bridge foot, the system behind the tailpiece. The other version often chosen is the X48C, a simple system with an XLR output and phantom power operation. To go further, for even more naturalness and respect of the acoustics, you can choose to associate an air mic with the contact mic to adapt to all situations. The 2X48AC combines both types of microphones in one system. The system is mounted behind the tailpiece.