Yes, the flatliner six has six outputs which can be each adjusted to 9, 12, 15 or 18V. So I think I’m going to put two of the outputs in series to double the voltage and use the 9V for the BMs if there isn’t any major difference in the sound. I was just wondering whether someone had tested BMs at 12V for example because I know that many people use higher input voltages e.g. for fuzz faces. I’ve also heard that the old DMMs used 18V, so I was thinking whether the same voltage could be used for the “new old” versions.