Posted by: "Klas Strandberg"
> Rob, - as far as I know, the MKH mic's use much more current than the mic=
's
> you have tested with the Rolls.
> It might very well be that the Rolls start to generate noise when that hi=
gh
> current is being squeezed out of it.
The MKH, except for the 80 & 800 use 2ma current, which is fairly low
for studio mics. The 80 & 800 use 3ma. These currents are well below the
official specs for a phantom power supply. Sennheiser's rating is for
the phantom to be 48 volts plus/minus 4 volts. I've used them down to 36
volts with no problem. Though I was not measuring the calibrated noise
level. By ear they were fine.
Portable phantom power supplied from low voltage batteries is often a
problem. You might want to check the Rolls phantom power voltage under
load and see just what you are supplying. The unloaded voltage won't
tell you, it will draw down under load.
Walt
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