Musical Fidelity M6I - Knob Feel Review This review marks the first time a manufacturer has been so confident in their build quality, that they have personally brought me an amplifier to review. And right they are! The M6I from Musical Fidelity has a truly outstanding Knob Feel. Built from what feels like a solid block of heaven, the rotation is meaty. Axial Skew doesn’t exist. Quite possibly the best I have had the pleasure of feeling. Thank you MF for bringing me this outstanding piece of machinery.