1,MOQ:5000m 2,Certificates: CCC 3,Conductor material: Cu,CCA or CCS 4,Supply the manufactory ... Features:1,Different length are available,2,music,speaker stands,3,Conductor :Oxygen free copper,Tinned copper,CCA21/0.14mm,30 ... connect power amplifier and loudspeaker equipment,broadcast system to transmit audio frequency signal, which is magnified by power amplifier.