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Tom Bowlus, Bass Gear Magazine:
The M6 is more scooped in the mids and has a bit more sheen and "glass" in the highs, compared to the D-800 prototype, at least.
Janus Zarate:
The production model seems to also match what tombowlus is describing. I played with an M6 versus a GK MB Fusion 800 late last week and found they had some midrange similarities, along with the sheen (although the GK has a bit more than the Carbine). The GK can get hairier and grittier though; the M6 seems better suited for clean tones. Compared to the M6, the D-800 has a stronger natural midrange and more tamed highs.
I should also add that I was able to get more of a growl out of the D-800 compared to the M6 off the bat, but in both cases I didn't play each amp for more than 10-15 minutes.
maisbass:
Did I mention this amp is loud at 2ohms?? Holy cr*p!!! This little sh*t kicks some serious booty! Wow!!
So sorry for the long winded analysis. This amp is definitely a winner, a keeper, and has a vast tonal pallete available to you. It has officially benched my GKMB 800 and sent it packing to the minor leagues.
The subway is not going to replace my Monique (nor would I expect it to replace a boutique tube amp), but I was able to dial in some tones very similar.
I absolutely love the amp. Thank you Mesa for a job well done!
nostatic:
The D-800 doesn't have the same baked-in low/mid thickness that the S900 had. I had to eq the crap out of that head to get near my "neutral" tone - the D-800 does it right out of the box. The D-800 sits in-between GK (edgy) and S900/TH500 (thick). It is close to the Puma but has a bit more heft, not too far off Monique, but not as much tube chew and bounce (but is a bit more extended).