Gemini XPB1600 power amplifier with XLR and 1/4" jack inputs, front to rear airflow through cooling fans, 3 mode operation, stereo, parallel mono and bridge mono mode, neutrik speakon & binding post outputs, see last picture for varying power outputs at different settings, frequency response 20Hz - 20kHz, signal to noise ratio 100dB below rated power @ 8ohm, power consumption 1000VA Boxed new item from 2003 never used or displayed Made in Taiwan