Whirlwind Mic to Line Driver/Headphone Monitor MD-1 - Manual (Page 3)

GAIN control adjusts the amount of level provided at the rear mounted output male XLR
jack. Nominal gain is 40dB in mic mode, with the control set at #6.
Headphone jack accepts 30
Ω
to 600
Ω
headphones for monitoring signals applied to the
headphone amplifier.
PWR button turns the unit on and off.
BATT OK LED illuminates when the unit is turned on and will not illuminate when
battery voltage is less than 13VDC.
VOLUME control adjusts the level of the headphones.
MIX control blends the signals from the driver circuit and the LINE IN jack to the
headphones.
LINE IN jack accepts balanced or unbalanced TRS line level signal and applies it to the
headphones through the mix control for foldback and other applications.
(On rear, not shown)
INPUT jack - female XLR, pin 2 positive. Transformer balanced in MIC mode and active
balanced, bridging in LINE mode.
OUTPUT jack - male XLR, pin 2 positive. Transformer balanced in driver mode and
hardwired parallel to the input XLR in loop mode.
DRIVER/LOOP button switches the male XLR output between the line driver or loop
through modes. Switch position is IN for driver mode and OUT for loop through mode.
SPECIFICATIONS
Equivalent Input Noise -123dB
Frequency Response ±3dBm 6Hz to 25kHz
±.1dBm 50Hz to 10kHz
-2.0dBm at 20kHz
Maximum Input Level
Line Mode +18dBm balanced
Mic Mode -4dBm unbalanced
Input Impedance
Mic mode 1.5k
Ω
Line mode 10k
Ω