The Bass Max is an upright bass transducer. It uses a "sandwich" design with two piezos layered together, one facing up and one down. This allows for a quick and simple wedge-mount into a bridge wing and ensures even transmission from the strings and from the body of the instrument. The Bass Max is very sturdy and has a high output signal that is balanced over the whole tone range. It is suitable for both arco and pizzicato playing styles because it transmits a broader mid frequency range. This enables the musician to change playing modes without having to adjust the amplifier. The connection jack is held in place by a special attachment clamp mounted at the A and D strings between string-holder and bridge. The wrapped cable eliminates disturbance. One Bass Max will evenly pick up the tone range of the double bass. It works very well with smaller bass combo amps. Technical Specs Diameter: 22 mm Thickness: 5 mm Output impedance: high ohmic Output: 1/4" Connection cable length: 6"