haven't heard the Mirages but on paper, I see they have two crossover points and the omni driver configuration appears to target mainly the higher frequencies.
OHM walsh drivers in comparison have a single crossover point at a relatively high frequency. The Walsh drivers deliver a highly frequency coherent omni sound very wide range up to that crossover point. The result is top notch performance through the critical midrange region. The OHMs are also not true omni in that range in that the omni driver sound levels are physically attenuated in the wall facing directions (by acoustic damping material inside teh "can") to allow for easier placement closer to walls than pure omnis.
OHM walsh drivers in comparison have a single crossover point at a relatively high frequency. The Walsh drivers deliver a highly frequency coherent omni sound very wide range up to that crossover point. The result is top notch performance through the critical midrange region. The OHMs are also not true omni in that range in that the omni driver sound levels are physically attenuated in the wall facing directions (by acoustic damping material inside teh "can") to allow for easier placement closer to walls than pure omnis.