QSC K.2 Series K12.2 2000 Watt Powered 2-Way Portable Loudspeaker. Connect the AC power cord to the IEC socket on the back of the amplifier. Make sure the plug is fully inserted into the IEC socket on the power amplifier module. Dual pole cup mounts (standard and 7.5 degree down-tilt).Frequency Response (-6 dB) : 50 Hz - 20 kHz.