weighing 135 pounds and built to the highest design and engineering standards in high end audio, this levinson 331 is outstanding in its tonal neutrality, transparency, and soundstage. this amp is fully balanced, and accepts both single-ended and balanced xlr inputs. the power rating is 100 wpc, and the high current output stage is stable down to at least 2 ohms, where the power output is 400 wpc. this amp is heavy, and will be shipped in the original factory boxing. this levinson operates on 120v only. it can be converted to 220v with a special build adaptor that ! is included. please contact levinson directly if you need this information. payment accepted only paypal.