刚买的HD660S还未到货 手里有个M2没怎么用 请问可以推耳机听歌使用吗 150阻抗

没问题，我入的M4了解过，官方回应
You do not need to purchase anything extra in this scenario; you should be able to plug in your M4 and start working. The M4 is designed for headphones between 15-600 ohms, meaning these headphones will work as intended.