I've just replaced the Andromeda by this guy. Soundstage seems not as wide as the Andro, but the bass has more speed, more power and punchy. Since i'm not a bass head, so it's difficult for me to exactly express the bass quality for you guys. In terms of bass quantity, i think M9 has less quantity than Andromeda
Treble and mid are brighter and extremely clarity and detail, i think M9 has even more detail than Andromeda, so if you love Instrumental music like Jazz, Rock, Metal, you should defenitely try this one.
Another cool thing i found that i can reskin the carbon shell for protection and customization very well