Heart "happy Shenzhen" gala concert held at the Happy Valley in Shenzhen city last night. Sound amplifying system for the party by BOB AS company of the 20 line array BOB BS, bass 24, power amplifier 22, 300 meters of the audience area of sound pressure level reached 108dB, and sufficient reserved interface, audio and video broadcast well with CCTV, Shenzhen TV, Shenzhen radio, by the leadership and the audience alike.