... PA/DJ speaker Features: 1), 115V/230V Transfer PA/DJ power amplifier for PA Speaker usage 2), Generally use on single 15 ... " Speaker as good power drive 3), Adjust of HF/LF SPL by +/-12dB 4 ... from external musical source such as mixer, computer 5), LED Power shows "on/off" 6), Clip LED: Lights up when system ...