My Mini-Me is powered by a 12V sealed lead-acid battery with parallel capacitors for current transients-- a custom design by this guy I know, which I use for my DAC normally, but I can take it into the field for recording.
What voltages does the internal circuitry need ... will have to provide a way to use a linear supply for all the internal voltages.
AKG's e.g. can use down to 9V without compromising anything.
And my next thought is how is this done? I'd assume with a switching DC-DC converter.
the current draw with the remaining 330Ω resistor in this configuration is so highP.S.: A customer of mine reported increased output when substituting the 8.2kΩ resistor with a 6.8kΩ.