Specifications

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PHANTOM POWER
Phantom power at regulated +20.2VDC through an equivalent 1.66Kohm resis-
tance is supplied to a microphone when the appropriate rocker DIP switch (S11,
S21, S31 position 1) is selected ON and the MIC/LINE pushbutton is in the MIC
position. This voltage level is more than adequate for most, but not all, phantom
powered microphones even though they may be labeled 48V phantom power.
Check the microphone specification sheet for 9 to 52V or 12 to 48V ratings (in-
cludes almost all electret type condenser microphones). Those few RF condens-
er microphones requiring a full 48VDC for phantom power will need our optional
PH48-1 internal accessory board.
On the XP100 only, 24VDC phantom power is individually selected for each input
with a jumper plug, P1, P2, P3 or P4. Moving the jumper plug closest to the P1,
P2, P3 or P4 marking selects phantom power for the corresponding XP100 input.
Of course, dynamic microphones don’t care if there is phantom power or how
much there is of it or whether it’s even turned on or not so long as they are prop-
erly wired with their coil across pins 2 and 3 of the XLR connector (shield to Pin
1). If they are not wired correctly they may sound real funny with the phantom
power turned on (or not at all, maybe ever again).
LEVEL CONTROLS
Each of the three inputs is controlled by its own audio taper potentiometer. These
controls preferably operate in the twelve-to-four o'clock range. If you consistently
run the input fader below the ten o’clock position, you should probably reduce the
preamp gain setting one step with the internal DIP switches to assure maximum
headroom and control resolution. If you have a preferred position for a particular
input, you can pop out the knob cap and reposition its reference indicator line to
the twelve o'clock position. A selection of colored knob caps is included with the
unit to allow you to color code the inputs.
The Master Control adjusts the Line Output as indicated by the LED meter. The
Master gains and output stages add 32 dB of additional gain. The Master Control
should normally operate above the two o'clock position to maximize internal
headroom and optimize noise performance.
LINE OUTPUT
The output stage of the mixer, A5, utilizes a unique active balanced output driver
IC, the SSM2142, that can sense whether the connected load is balanced and
floating or is unbalanced due to either side being grounded. A balanced output