ATI Audio MX200 - Manual (Page 5)

Audio Technologies Inc. 856-719-9900 [email protected] www. audio.com
high direct input clipping level of -12dBu (260mV peak) in the 30dB position and
optimum noise performance of -126dBm EIN (Equivalent Input Noise) at 50dB
gain. In the LINE input switch position, preamp gain is unity and peak line level
inputs of +18dBu are accepted with nominal inputs adjustable over the range of -
10 to +4dBu.
Phantom
Power
Phantom powered microphones will see a regulated +20VDC, open circuit,
through a split and balanced 1660-ohm equivalent resistance. This provides over
+12VDC to the typical 4ma powered microphone. Phantom power is individually
selected for each input with a jumper plug labeled PH PWR placed in the ON
position. Moving the plug to the OFF position removes phantom power and
grounds the phantom power network. Phantom power is automatically removed
when LINE inputs are selected. The phantom power regulator prevents sub-sonic
oscillations and line bounce on the phantom power supply.
Low
Cut
Filters
-­‐
MXS100
only
Individual two pole active low cut filters for the reduction of thumps, bumps, and
small hurricanes are controlled by front panel toggle switches. The -3dB corner
frequency is 125Hz with 30dB roll off at 20Hz.
Input
Level
Controls
and
Pan
Pots
Each input is adjusted by its' own audio taper potentiometer located after the
preamp stage to minimize noise. These controls are designed to operate in the
ten-to-two o'clock range (-12dB). If you have a preferred position for a particular
mixer input, you can pop out the knob cap and reposition its' reference indicator
line to the twelve o'clock position. Extra knob caps are provided to allow you to
color code the inputs. Yellow, red and green caps are supplied in addition to the
gray caps on the units. To replace the caps, gently pry out the old cap and press
in the new one. Concentric pan pots on each input feed equal signals to left and
right mixing busses in the center position with a reciprocal boost of 1.3dB and a
cut to full off at the extremes.