ButtKicker STANDING-PLTFM-PKG Heavy duty monitoring for bass players and standing musicians.Includes: (1) ButtKicker Platform (1) ButtKicker Concert (1) ButtKicker Power Amplifier (1) Cable kit for connecting the ButtKicker Concert to the ButtKicker Power AmplifierButtKicker Concert Designed specifically for musician monitoring, stage and studio use, the ButtKicker Concert low frequency audio transducer is used by over 100 of the world's top touring groups