... , active speaker, self-power speaker, powered speaker, amplifier, professional amplfier, Disco speaker, chuch speaker, switching power amplifier, transformer ... live performance, stadium, outdoor use, fixed installation.ZSOUND Pro audio TCD-4 outdoor power distribution box System Power ... 1-2 PCS +PUZZLE PICTURES ABOUT FACTORY /OFFICE/ FAIR +ZSOUND Pro audioTCD-4 outdoor power distribution box TCD-4 ...