ATI MX200 User Manual

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MX200 MX200C MXS100

XPS100 XPS200

STEREO MIXERS and EXPANDERS

OPERATING AND MAINTENANCE MANUAL

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The ()%*++'is a three input miniature stereo mixer designed for demanding in­the-field use in broadcast ENG (Electronic News Gathering) and Field Production
applications. The MXS100 incorporates the functions required by news
professionals, sports announcers, film and video sound engineers into a tiny,
lightweight and rugged package.

The MXS100 Stereo Field Mixer is ideal for field use with DAT and other high
quality recording devices since it has extremely low input noise, wide, smooth
frequency response and low harmonic and IM distortion. Active balanced input
and output circuits eliminate transformer-induced microphonics, ringing, transient
overshoot and low frequency distortion. Digital compatible dynamic range of
98dB is achieved at normal operating control settings. Full 18dB headroom
above 0VU (+4dBm) is augmented with a fast, low distortion limiter. A built-in
tone oscillator and slate microphone make it easy to set levels and mark takes. A
switchable headphone feed allows program monitoring to one ear with a directors
cue fed to the other. A simple, foolproof optional gel cell battery power pack
allows extended field operation and fast full dual voltage recharge with no cell
memory deterioration.

The (),++' and (),++-' Stereo Studio Mixers retain the identical high quality
audio performance of the MXS100. They are an excellent choice for use in
studios, TV vans, and with the companion Expanders, makes a very powerful
mixing system in only one rack unit (1 ¾”). The MX200C adds an output limiter to
the basic MX200 features.

The companion )!%*++' Input Expander adds four switchable XLR
Microphone/Line inputs with pan pots and switched 24VDC phantom microphone
power.

The companion )!%,++'Stereo Line Input Expander adds two stereo -10/+4 line
inputs with close tracking VCA stereo level controls.

The MXS100/ MX200/ MX200C mixers may be used alone or in combination with
the XPS100 and/or XPS200 expanders for any application requiring a compact,
rugged and professional sounding mixing or input selection system. Several
expanders may be added for up to a 23 input system with minimal noise buildup
in the mixing system. Several power modules are available including both
replaceable and rechargeable 24V battery packs, DC-to-DC step-up converters
for 6 to 18V automotive or belt pack battery power and plug-in 24VDC wall mount
power supplies.

An optional rugged Field Pack carry bag includes side protection plates for the
mixer with quick-change slide mounts for the battery packs.

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Three XLR inputs with plug programmable phantom power and front panel
MIC/LINE switches drive low noise instrumentation preamplifiers with a wide
range of internally selectable gains to accommodate either high output wireless
or low output boom microphones. Front panel switches activate individual two
pole LO-CUT filters to block bumps, thumps and wind noise.

Center-detent PAN pots feed the stereo mix busses along with a switched TEST
TONE oscillator and a momentary switched SLATE microphone to easily mark
takes. Bright, intense LED bargraph VU meters monitor the line level outputs and
are easily viewed even in bright sunlight. A LIMIT indicator and switch shows
peaks and controls limiter action. The MXS100 provides high level active XLR
stereo line outputs to drive either balanced or unbalanced external loads of 600
ohms or higher. Rear panel switches individually select microphone or line output
levels. A stereo TAPE OUT jack provides an isolated -10dBu for an external
recorder.

A front panel headphone switch selects either stereo program (L/R) or mono­summed program with cue (L+R/Q) as an input to the stereo headphone
amplifier. A stereo TAPE IN jack routes an external -10dBu monitoring signal to
the headphone amplifiers in place of the stereo program feed. A recessed,
thumbnail operated headphone level control minimizes panel clutter and once
set, tracks the MASTER output. An external CUE input jack or a pre-fader cue
from any of the three inputs may be jumper plug programmed to the headphone
cue circuit. The expansion buss input allows interconnection of two MXS100s or
the addition of one or more companion XPS100 Mic Expanders or XPS200
Stereo Line Expanders.

All panel controls, internal adjustments, and jumper plugs are clearly labeled.

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The MX200 and MX200C Stereo Studio Mixers are also three input stereo mixers
with front panel selection of microphone or line input levels. Phantom power is
internally jumper plug programmable to any microphone input. Detented Pan
Pots feed fader output to the stereo mix busses. A close tracking VCA stereo
MASTER level control feeds stereo high-level line output stages. The outputs
comfortably drive either balanced or unbalanced output loads of 600 ohms or
greater. Bright LED VU meters and a stereo headphone amplifier monitor the
program outputs. XLR output connectors are standard. A rear panel Expander
input allows interconnection of two mixers or the addition of one or more
companion XPS100 or XPS200 Expanders. The MX200C adds a switched low
distortion compressor/limiter and peak indicating LED to the basic MX200 mixer
features.

INPUT EXPANDERS

The companion )!%*++' Input Expander provides four XLR microphone/line
inputs with pan pots and switched phantom power. The )!%,++' Stereo Line
Input Expander controls two stereo -10/+4 XLR line level sources with tight
tracking stereo VCA level controls. The XPS100 and XPS200 are supplied with
interconnecting expansion cables for the audio and DC connections to the
MXS100, MX200 or MX200C.

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A MXS100, MX200 or MX200C Mixer and a pair of companion Expanders can
comfortably share a single WA100-1, 24VDC / 400mA. wall mount power supply.
220VAC and 50Hz power supplies are available for offshore use. The Mixers can
also be powered directly by a PPA-1 rechargeable 24VDC battery pack or by a
DCA100 DC to DC step-up converter connected to 6 to 18VDC automotive, belt
packs, NP1s or 12V gel cell batteries. The PPA-1 and DCA100 can both mount
to the mixer chassis as an integrated system.
The BBU100 is a replaceable 9V battery pack that can be quick change, slide
mounted with the PROK-1 accessory.

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Accessory protective side plates (PROK-1) extend past both front knobs and rear
connectors and will allow no damage to the unit. The PROK-1 includes quick­change slides for the battery and converter modules. An attractive protective
carrying bag with shoulder strap is available (ABAG-1) and includes the PROK-1
protection plates. Up to three NANOAMPS will mount side-by-side in only one
rack unit using the available rack mounting kits. NANOAMPS may also be neatly
stacked or mounted side by side on your desk with the available angled desk
mounting kits.

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The input stages of the MXS100, MX200, MX200C and XPS100 are identical.
They are designed around a very low noise and low distortion, balanced and
floating input, instrumentation amplifier. The SSM2017 is one of the latest
generations of devices designed specifically for use as a low noise microphone
amplifier. In addition to ultra low noise and distortion, it boasts a very high slew
rate of 17V/µs virtually eliminating slew induced Transient Intermodulation
Distortion. The direct balanced low noise inputs eliminate the need for input
transformers and avoid their distortion, transient overshoot, roll offs and
microphonics. The input preamp stages can operate at a MIC gain of 30, 40 or
50dB as selected by an individual jumper plug for each input. To access the
jumper plugs, remove the four cover screws (top two on each side) and pull the
top cover up and off. For 30dB operation, remove the gain jumper plug
completely or plug it on to only one pin for safekeeping. The preamps have a

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.

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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.

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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.

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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.

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