In stereo mode it is possible to use speakers with an impedance between 4-8 Ohms with the MXW70. This amplifier outputs 70W RMS per channel when in use with 8 Ohm speakers, and 125W RMS alongside 4 Ohm speakers.
In mono mode it is only possible to use 8 Ohm speakers alongside the MXW70. In this mode the output is 250W RMS.