The bass in M6 is the most improved part from M Project. I used M Project for 2.5 years. The only deficiency I can find on M Pro is the bass although is very revealing is a little light. The use of a subwoofer can certainly add more bass not at the expense of resolution.

M6 bass is much stronger than M Project and at the same time very revealing. Midrange is smooth and warm, treble is detailed but not edgy. If you like
M Project sound, M6 gives you the sound you die for.

Very helpful! Thank you! I do have issue with the M Pro bass in that what it produces is great, but I feel it definitely needs a subwoofer. Do you think the M6 needs a subwoofer? Have you tried classic rock with the M6 with a sub? Will it give you that punch (that the M Pro will not without a subwoofer)?

Meant “classic rock with the M6 without a sub” ....

The bass of M6 now is enough for me. I know a little more bass will come after more break in.

I prefer music with a lot of details, ie high resolution. It is exactly what M6 and M Pro are giving me. Although there are many supporters for subwoofer, it will nevertheless reduce resolution. I am happy to stay out of it.