The B12-PS that I have sounds a lot more in line with gabedamien's, mine's most pretty good except for a few frequencies where it resonates, you put a finger on it and the vibration is very pronounced, the worst case seems to be right around 1,100 RPM, though they seem to be scattered all over its ...

The B12-PS that I have sounds a lot more in line with gabedamien's, mine's most pretty good except for a few frequencies where it resonates, you put a finger on it and the vibration is very pronounced, the worst case seems to be right around 1,100 RPM, though they seem to be scattered all over its R...