Petit extrait de ce qui se dit sur talkbass
"Good question, and one that I have been researching, being as I want(ed)either one of those amps. To my ears, no, the M9 and M-Pulse are not inherently similar sounding, no matter how you EQ them. The M-Pulse sounds lovely: creamy, pillow-like, and authoritative. The notes just seem to hang in the air like big bubbles. The M9 is leaner and more muscular sounding, very bold, but with much less of the 'tubey' texture I hear from the M-Pulse. It is also louder than !@#$ when paired with quality speakers. I'll eventually be buying the M9, as it does all the things I currently want, without breaking a sweat. Both strike me as great amps but speak with significantly different voices, tonally. Hope this helps."