ATI Audio MX200 - Manual (Page 8)

Audio Technologies Inc. 856-719-9900 [email protected] www. audio.com
Tape
In,
Tape
Out
-­‐
MXS100
only
Rear mounted stereo 3.5mm TRS jacks provide a -10dBu high impedance,
unbalanced Tape Output to recorders and a matching -10dBu Tape Input for
playback monitoring. Use of the Tape Out jack will not affect the Program output
signal. Use of the Tape In jack interrupts the Program signal feed to the internal
headphone monitor and substitutes the Tape playback signal.
Expansion
Inputs
A 1/8" TRS (Tip-Ring-Sleeve) jack, J10 mounted on the rear panel feeds the
stereo mixing buss to allow interconnection of two mixers or the addition of
XPS100 and XPS200 input expanders. The tip and ring float at half the supply
voltage and must not be externally grounded. These points are zero impedance,
current summing nodes on which you should normally be able to measure
nothing other than a DC voltage.
Expansion
Outputs
-­‐
XPS100
and
XPS200
The XPS100 and XPS200 Expanders amplified mixing buss outputs appear on
rear panel paralleled 1/8" TRS jacks, J7 and J8. The nominal output is +4dBu
unbalanced through a 287Kohm source resistance to feed the current summing
expansion inputs of the MXS100 or MX200. The paralleled jacks, J7 and J8,
allow multiple Expanders to be looped together and into the MXS100. Internal
jumpers can bypass the 287Kohm resistors to allow direct use of the Expander
outputs for low impedance loads down to 600 ohms.
Power
Supplies
NANOAMPS require 22 to 30VDC from an external power source. The DC power
connector is wired with the center pin negative and the outer cylinder positive. A
series diode and a thermal overload device protect the unit from reversed polarity
DC input. The mixers and expander incorporate an "artificial ground" power
supply splitting circuit to continuously track the DC input voltage and provide a
center point voltage reference for the audio stages.
A low dropout regulator provides a regulated 20.2VDC for phantom powering
microphones from inputs as low as 21VDC. Active regulation of the phantom
power supply helps eliminate any possibility of oscillation due to unbalanced
loading of the phantom supply by the microphone.
Several amplifiers can share a common external 24VDC "Wall Wart" type power
supply for fixed installations. A pair of loop-thru DC connectors on the rear of
each module permits several units to be daisy-chained with P/N20602-1 DC
power cables to a single WA100 power supply. Each Expander is supplied with a
set of loop-thru DC and audio cables for easy interconnect to a companion Mixer.