What is the difference between the M1070 and the M1570?

The models are using different drivers. The M1570 go deeper with more impedance. They are 120 g heavier than the M1070 because they have more metal parts and are more durable. The headphone jacks are different: The M1070 come with dual 3.5 mm and the M1570 come with dual 6.35 mm.