Specifications

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slate mike level adjustment.
A 740Hz low distortion test tone oscillator is selected by the maintained up posi-
tion of the same panel switch. The oscillator is injected into the mixing buss at
the optimum level to set your master control for 0VU (+4dBm out). A bi-color LED
lights to tell you that funny sound in the mix is the test tone oscillator you forgot to
turn off.
EXPANSION INPUT
Loop-thru 1/8" T-S (Tip-Sleeve) jacks J7 and J8, mounted on the rear panel, feed
the mixing buss at the input of A4A. This point floats at half the supply voltage
and must not be externally grounded. This point is low impedance, current sum-
ming node on which you should measure nothing other than a DC voltage.
EXPANSION OUTPUT
The XP100 amplified mixing buss output appears on paralleled 1/8" Tip-Sleeve
jacks J7 and J8. The nominal output is +4dBu through a 200K-ohm source resis-
tance, which feeds the current summing expansion input of the MX100 when so
connected. The paralleled output jacks, J7 and J8, allow multiple XP100 units to
be looped together and into the mixer.
POWER
Required: 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 di-
ode and a thermal overload device protect the unit from reversed polarity DC in-
put. 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 in the MX100 and MX101 provides a regulated 20.2VDC
for phantom powering microphones from inputs as low as 21VDC. Active regula-
tion of the phantom power supply helps eliminate any possibility of oscillation due
to unbalanced loading of the phantom supply by the microphone.
All mixers 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 Mixer
and Input Expander permits several units to be daisy-chained with P/N 20602-1
DC power cables to a single WA100-1 power supply (provided with all MX units).
Each XP100 Expander is supplied with a set of loop-thru DC and audio cables for
easy interconnection to a companion MX100. The WA100-1 is a 400mA supply.