Here is the reply I got from Thom Davis of ART's tech department
regarding powering the ART Phantom II from an external battery.
-John Hartog
"The internal Phantom power supply is filtered and regulated so that it
can handle a fairly wide range of supply voltages. As long as the
external supply is over 12 Volts DC then the internal circuitry will
maintain the Phantom voltage at either 12 Volts or 48 Volts (depending
on switch position. As far as a high end on the voltage, we would
suggest staying under 24 Volts on the high end. In fact if you install
two 9 Volt batteries, they are placed in series and are therefore
providing 18 Volts to the circuitry. If the supply drops below 12 Volts
DC then the unit does not regulate the voltage so supply fluctuations
may feed thru at a low level, but the supply will still work though
it's output DC voltages will drop proportionate to the supply voltage
at that point. This allows for "soft failure" in remote recording
situations where even though the supply is lower and the phantom power
is lower you will still be getting enough signal to keep the mics live
for a while longer."
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